How to Plant, Grow, and Care For Zinnia Flowers (2022)

If there’s one flower staple in the home garden I had to choose, then zinnias would have to be it! These heat-loving Mexican natives are easy to grow, low maintenance, and produce a jazzy pop of color all throughout the summer.

Zinnias can have versatile applications in landscaping and home gardens as long as you have a warm, sunny spot on your property. Plant a low-growingZinnia angustifoliaalong a landscape border, a unique two-tonedZinniahaageanavariety in a patio container, or a giant-floweredZinnia elegansvariety as a companion plant in your vegetable garden! None of these species will disappoint when it comes to cheeriness.

Are you looking for a flower that’s easy to sow and grow? Well, zinnias are the answer. As long as you plant your seeds or transplants after your last expected frost, then your zinnias will be off to the races. They grow relatively fast, with seedlings sprouting within days. The best part? Zinnia plants aregivers. Cut off faded blooms and these highly productive plants will be churning out more blooms for you to enjoy!

Contents

  • 1 Plant History
  • 2 Propagation of Zinnia
  • 3 How to Grow
  • 4 When and How to Harvest Zinnias
  • 5 Varieties of Zinnias
  • 6 Pests and Diseases of Zinnia
  • 7 Plant Uses
  • 8 Frequently Asked Questions
  • 9 Final Thoughts

Zinnia Overview

How to Plant, Grow, and Care For Zinnia Flowers (1)

Plant Type Herbaceous Annual

Plant Family Asteraceae

Plant Species elegans, angustifolia, haageana

Plant Genus Zennia

Native Area North America, South America

Hardiness Zone USDA 9-11

(Video) How to Grow & Care for Zinnia to Get Lots of Blooms [with Updates]

Tolerance Heat, Drought Resistant

Sun Exposure Full Sun

Watering Requirements Low

Maturity Date 75-90 Days

Growth Rate Fast

Plant With Insect Pollinating Veggies

Don’t Plant With Plants That Like Cool Weather

Soil Type Well-Draining

Plant Spacing 6-12 inches

Planting Depth 1/4 inch

(Video) Growing Zinnias and Care of Zinnia Plants

Plant Height 8 inches – 3 feet

Maintenance Low

Attracts Butterflies, Bees, Hummingbirds

Pests Aphids, Mealybugs

Diseases Downy Mildew, Leaf Spots

Plant History

How to Plant, Grow, and Care For Zinnia Flowers (2)

Zinnias were thought of as relatively uninteresting when the Spanish conquistadors first traveled through Mexico in 1519, but since then the zinnia has become a bright, cheery, and easy-to-grow staple in the home garden. Claire Shaver Haughton’s bookGreen Immigrants: The Plants that Changed Americagives an excellent account of the history of the zinnia, which can be summarized thus:

The zinnia began as a prolific plant with small daisy-like flowers in colors of dingy purple and dull yellow. The Aztec name for the zinnia translated to “eyesore,” so when the Spanish trekked through Mexico in the 1500s, the plant was then called “mal deojos.”

In the 18th century, a young German doctor named Dr. Gottfried Zinn began collecting and studying wildflowers, and a friend of his that happened to be the German ambassador to Mexico sent him some seeds of the “mal deojos” that had remained relatively insignificant since Europeans first set eyes on it a few hundred years prior. By 1759, Dr. Zinn had died and this new flower was named “zinnia” in his honor.

European Popularity

The flower became somewhat popular in European gardens and was nicknamed “everybody’s flower,” “poorhouse flower,” and “garden Cinderella.” In the 1880s, the French began experimenting with zinnias and eventually produced a dwarf form that was rather adaptable. This led to further experimentation with zinnia breeding. In 1886, a double zinnia in bright, clear colors with a larger flower was produced. It was then that plant breeders in the United States began to take interest in the zinnia.

Sixteen species of zinnia were discovered after U.S. breeders began to take notice, and all of these species were found to be indigenous to Mexico. It was surmised that most of the European species were derived fromZinnia elegansandZinniahaageana. Known for being a “weedy” species, the zinnia naturally had sturdy stems and a slightly pungent odor that discouraged insects, and was also mostly tolerant to any type of soil or climate, though it flourished in rich soil and warm weather.

United States Popularity

By 1920, a man named Luther Burbank had produced a dahlia-like zinnia in California. After Burbank died, his head gardener, William Henderson carried on the zinnia research. Eventually, William Atlee Burpee bought the Henderson Seed Company in the 1940s and moved the zinnia research to a farm he specifically purchased for zinnia experimentation, due to the original location being too near Pacific fogs, which were not ideal for a plant that loves sunny and warm weather.

Burpee began an extensive breeding program focused on hybridizing zinnias. The matter was proving difficult, as he found that he could force some zinnia plants to become tetraploids, but could not produce a tetraploid plant with fertile seeds.

Tetraploids are plants with double the number of chromosomes that are formed when the plant undergoes some sort of sudden shock, like freezing or extreme heat. If the seeds of a tetraploid plant prove fertile, then the breeder will be able to produce plants with larger and more complex flowers, obviously a desirable trait for a plant breeder and seed company.

The struggle was concerning, but suddenly, in 1948, in row 66 of Burpee’s Santa Paula farm, a freak zinnia was discovered. Nicknamed “Old 66,” this wholly female zinnia had a flower head that looked like pincushions filled with pin-like stigmas, but the plant had no petals and no pollen-laden stamens. However, the plant was able to fertilize with some of the best of Burpee’s male-flowering zinnias.

Ten years later, after much experimentation and selection, the first-generation of F1 hybrid zinnias were established and went onto the market. Old 66 was the mother of all these new zinnias!

(Video) 😀 Zinnia Plant Care, Part 2: Fertilizing, Cut Flowers, and Deadheading 😀

Today, zinnias come in many shapes, sizes, and colors. Some of the most popular colors are pink, yellow, red, and even green. You can find giant, mini, cactus-like, pompon, and ruffled zinnias. Some grow 3 ft tall while others grow only 6 inches tall. The state of Indiana deemed the zinnia its state flower in 1931 until it was suddenly uprooted by the peony in 1957, a decision that was not withoutcontroversy. Regardless, zinnias are a cheery favorite in home gardens today!

Propagation of Zinnia

How to Plant, Grow, and Care For Zinnia Flowers (3)

Just like cockscomb, the best way to propagate zinnias is by seed. Seeds can be started indoors 4 to 6 weeks before your estimated last frost. Plant seeds at a depth of ¼” and place them in a warm space, with a preferred temperature of 75 to 85 degrees F.

Zinnia seeds need darkness to germinate. Seeds will sprout rather quickly when given the right conditions, sometimes even within 24 to 48 hours! However, expect sprouting in 3 to 5 days. Transplant the seedlings into the garden when they are 3 to 5 inches tall and water well.

To direct sow into the garden, plant seeds 6 to 12 inches apart in a row and plant at ¼” depth. Zinnia is also a great candidate for broadcast sowing, but make sure to lightly rake the seeds into the soil to promote quick germination.

Plant seeds or transplants into the garden or into a potafteryour last frost. You can plant successions of zinnias up until the middle of the summer for continuous blooms! If you know when your expected first frost will be in the Fall, you can count back about 60-90 days (depending on the variety you are growing) to determine when your last possible planting date should be during the summertime.

How to Grow

How to Plant, Grow, and Care For Zinnia Flowers (4)

Plant zinnias infull sun(at least 8+ hours per day). These plants will thrive in hot, sunny conditions. In fact, if planted in shady areas the plants will become leggy, produce fewer blooms, and are more prone to mildew.

Excessive fertilizer application can promote mildew on zinnias. Providing a well-balanced (mostly equal parts of nitrogen, phosphorus, and potassium) fertilizer in a dry, granular form when preparing the bed is often all that is needed for this plant to grow.

Pinching the plants when they are about 6 inches tall will promote long, straighter side branches and a bushier plant. However, if you are regularly deadheading the plant (clipping off faded blooms), making a deep cut into the plant will also promote more branching without the initial pinch at 6 inches.

If you want to keep your plant blooming, make sure to deadhead regularly. Leave some flowers on the plants if you would like to save seed, but be aware that hybrid zinnias will not produce seeds true-to-type (exactly like the parent plant).

Some zinnia varieties with larger flower heads may tend to sprawl and thus need to be supported. Commercial zinnia growers often use flower netting to support stems, but for the home gardener, it may not be necessary.

Planting closer together will allow the stems to be supported by the adjacent plants, but be aware that tighter spacing may also promote mildew, due to poor circulation of air.Zinnias are usually considered annuals and will return year over year if taken care of properly. They are drought tolerant annuals, and can thrive with minimal moisture.

When and How to Harvest Zinnias

How to Plant, Grow, and Care For Zinnia Flowers (5)

If your goal is to harvest zinnia blooms for a flower arrangement, then you should cut the blooms after they have fully opened and a few of the yellow, star-like stamens have begun to appear. Even then, your zinnia may not be ready to harvest, because the upper part of the stem must be sturdy to prevent wilting in the vase.

The best way to identify the right time to harvest is by doing the “wiggle test.” Simply grab the zinnia stem about a foot down from the flower head and give a gentle shake. If the flower head seems to flop back and forth, then it is too early to cut the stem. Wait a few days and try again. If the stem feels sturdy and the flower head stays put as you shake the stem, then it is ready to cut! Cut at the base of the stem you’re harvesting or cut just above 3 to 4 side shoots if you’re cutting the main stem. This will promote further branching.

If you want to harvest and save seeds, wait until the flower head has faded and the brown, flake-like seeds have formed on the flower head. Store the seed in a cool, dry place until you’re ready to plant.

Varieties of Zinnias

Below are some of the most popular varities of Zinnias that you’ll likely consider planting in a home garden setting. We’ll look at the most popular varieties, as well as what what flower color you can expect from each type once planted.

Zinnia elegans

How to Plant, Grow, and Care For Zinnia Flowers (6)

Plants grow between 1 to 3 feet tall with large blooms. The most widely grown variety is the “Benary’sGiant” series, with 4 to 5-inch full blooms that are prolific and mildew resistant. They are available in 13 colors.

‘Uproar Rose’ has stunning, large, rose-colored blooms and is well-branching. The ‘Queen’ series has become very popular because the colors appear in antique shades that are all the rage, with shades of rose, orange, and blush fading in with lime.

‘Zowie!’ is unique withitsbicolor gold and magenta petals that stand out in the garden. ‘Oklahoma’ zinnias come in a range of colors but the blooms are much smaller, topping out at about 2 inches in diameter.

Zinnia angustifolia

How to Plant, Grow, and Care For Zinnia Flowers (7)

Plants in this species are used mostly in borders, containers, and hanging baskets due to their low-growing nature, with dwarf varieties as low as 6 inches tall. Some varieties can be as tall as 3 feet, however. The ‘Crystal’ series is a carefree, single-petaled variety that comes in orange, white, and yellow. This variety tops out at 10 inches. The ‘Star’ series is vigorous with star-shaped flowers and is downy mildew resistant.

Zinniahaageana

How to Plant, Grow, and Care For Zinnia Flowers (8)

This species can grow up to 2 feet tall with smaller flowers (about 1-2” across). Many of the flowers are two-toned, which makes for a stunning display of color in a flower bed. ‘Aztec Sunset’ produces 2-inch flowers in a range of colors from red, yellow, orange, and even a bicolor flower of orange and maroon. ‘Soleado’ has bright, cheerful blooms of orange and yellow with a mahogany ring around the center.

Pests and Diseases of Zinnia

How to Plant, Grow, and Care For Zinnia Flowers (9)

While zinnias are relatively low maintenance, they are very susceptible topowdery mildew. Powdery mildew appears as a matte, whitish haze on the leaves usually in late summer or in crowded plantings with poor air circulation. The best way to avoid powdery mildew is to increase spacing between plants.

(Video) 5 Tips to Grow AMAZING Zinnias || How To Grow Zinnias || Cut Flower Garden

Alternaria leaf spot and bacterial leaf spot are two other common diseases in zinnia that cause brownish splotches or spots on the plant, usually starting from the bottom leaves and spreading upwards. During wet weather, these diseases will thrive. Affected foliage can be removed and destroyed (do not put in your compost pile) or you can apply a copper fungicide during periods of wetness to reduce the advancement of the disease. Always follow label instructions when using fungicides.

To prevent outbreaks of disease on your zinnias, make sure you have planted them in full sun. Leaf spot diseases are more prevalent in partial shade. Water your zinnias at the base of the plant rather than overhead, and water in the morning so that any water that’s splashed onto the leaves can dry throughout the day. Rotate zinnias within your garden each year. Also, clear away and destroy any diseased plant material from the previous season. Do not save seed from diseased zinnias, as some leaf spot diseases can be transmitted via seed.

Aphids, mites, and leaf miners can sometimes be an issue for zinnias. A forceful stream of water applied to the zinnia plants can sometimes knock these small pests off the plant.

One insect not mentioned in many sources about zinnias that I have had trouble with in the past is Japanese beetles. These beetles will chew on mainly the leaves of the plant, leaving a skeleton of leaf veins behind. They seem to come rapidly and then disappear just as rapidly, so when they come to visit my garden I like to pick them off and throw them into a bucket of soapy water rather than spray them.

Plant Uses

How to Plant, Grow, and Care For Zinnia Flowers (10)

Zinnias are excellent pollinator plants that will attract butterflies, bees, and hummingbirds. Be aware that the more petals the variety has, the harder it is for pollinators to extract nectar. So, often the big fluffy double blooms are not ideal for a pollinator patch. Because zinnias attract pollinators, they are an excellent companion plant for vegetables that require insect pollination.

Zinnias are also excellent cut flowers that provide beautiful color to summer bouquets. Zinnia flowers can also be dried in silica gel and used in dried flower wreaths in the Fall and Winter.

Frequently Asked Questions

This is a conundrum amongst many growers, especially with the scabiosa-type cupcake zinnias. One of the reasons that your zinnias are mostly sparse singles isdue to genetics, and the other reasons are due to environmental factors.

It’s been found that in milder climates with ample moisture that this is less common, so the best advice is to water your zinnias well and plant them into good soil in full sun. Any stress may cause the plant to show its ugly side.

The first thing you should examine is whether your zinnia bloom was ready to cut in the first place.Perform the “wiggle test”by gently shaking the stem of the plant.

If the flower head flops too much, then you need to wait a few days before harvesting. Also, a good sign is when you see several of the yellow star-shaped stamens begin to appear in the center of the flower. The wiggle test is especially important for the zinnias with giant flower heads, as the flowers can be somewhat heavy.

Sometimes zinnias can flop over if not supported, but for the most part, if zinnias are planted in a group planting, thenthere is no need to stake them. Commercial cut flower growers will often use flower netting in order to ensure tall and straight stems.

However, as a home gardener, you will likely enjoy the way your zinnias naturally grow. Pinch your zinnia plants when they are six inches tall just above a set of leaves to produce a bushier plant. Remember to clip off spent blooms frequently so the plant will shoot out more blooms for you to enjoy.

(Video) Growing Zinnias from Seed Cut Flower Farm Gardening Garden How to Grow 🌱🌱💚💚

Final Thoughts

If you’re looking for a long-lasting, low-maintenance, and colorful flower to grow in a sunny location in your garden, then no look further than zinnias! These cheerful blooms are easy to sow and grow. Cut blooms off all summer to bring inside for a pop of color on your dining room table. Or, watch as butterflies, bees, and hummingbirds galore flit to andfrothroughout your zinnia patch. This flower is a must-grow for beginning gardeners, kids, and veggie gardeners. You won’t be disappointed!

FAQs

How do you take care of a zinnia plant? ›

They generally take a week to sprout and 60 days to flower. Deadhead to prolong flowering maintain

Do zinnias grow better in pots or in the ground? ›

Zinnias will thrive in your container gardening ideas. If you're choosing this option for how to grow zinnias, make sure you choose a large container that has drainage holes in the bottom. The taller the zinnias you have in mind, the larger the container should be.

How do you grow zinnias fast? ›

Zinnias are able to adapt to most soil conditions, but the ideal soil will be rich in organic matter and well-draining. Soil pH should ideally be between 5.5 and 7.5. If soil is amended with compost (humus), the flowers will grow more quickly. Learn more about soil amendments and preparing soil for planting.

How long does it take to grow zinnia flowers? ›

Zinnias typically take around 2 months from seed to flower, although this can change depending on weather conditions. Here are some additional tips to grow zinnias: Choose a bright and sunny spot for your zinnias. Cover zinnia seeds with just ¼ inch of soil because they need light to germinate.

Where do zinnias grow best? ›

Light: Zinnias grow and flower best in full sun. They can flower in part shade, especially in warmer climates with afternoon shade, but they may be more susceptible to disease and have fewer flowers. Soil: Zinnias grow best on fertile, well-drained soils high in organic matter.

Do zinnias grow well in pots? ›

Zinnias are colorful additions to any flower garden – they're great for cutting, they are easy to grow and start from seed – so they make a great choice for container gardening.

What is the best month to plant zinnias? ›

April or May is the best time to plant zinnia seeds in a greenhouse or cold frame or on a bright windowsill, for earlier flowering. Zinnias are half-hardy annuals that dislike the cold, so don't sow them under cover too early in spring because they shouldn't be planted out until the weather has warmed sufficiently.

How long do zinnia flowers live? ›

Many varieties of zinnias will last from seven to 12 days in a vase. Zinnias are the workhorse of the farmer's market, too.

How do you keep zinnias blooming? ›

How to get more blooms by deadheading your zinnia flowers

How often should I water zinnia? ›

* Water zinnias at ground level to prevent fungus. Once they are 3 to 4 inches high, water them deeply a couple of times a week, depending on weather. Zinnias aren't drought tolerant, but they like their soil a little on the dry side. The soil should not be continuously wet.

Do zinnias grow back after cutting? ›

Remove the foliage and don't be afraid to cut off side shoots on the main stem you just harvested. Zinnias are a “cut and come again” flower, so when you cut the plant “hard,” it responds by sending out even more long, strong stems all season long.

Do zinnias like full sun? ›

Zinnias' pointy seeds, shaped like little arrowheads, require only basic garden prep to sprout: sow them in well-drained soil, where there's full sun and lots of summer heat, and you'll have tiny seedlings in days, with flowers powering up in just a few weeks.

Why are my zinnias dying? ›

If you've been experiencing drought conditions and your zinnias are starting to die, it's likely due to a lack of water. One of the first signs that your plants aren't receiving enough water is wilting. The leaves will droop and shrivel and, if the situation isn't corrected, they will begin to turn brown and die.

How many times do zinnias bloom? ›

Zinnias are annuals, meaning they only last one growing season. But what they lack in longevity, they make up for in flowers. Zinnias are compatible with many other garden flowers and plants.

Why are my zinnias not growing? ›

Blooms produced by zinnias require a great deal of energy from the plant. Because of this, zinnias thrive best in full sunlight, requiring six or more hours per day. Too little sunlight for too long will prevent new zinnias from germinating and seedlings from developing.

What sort of soil do zinnias like? ›

Soil type: Fertile, well-drained soil is best.

How tall do zinnia plants get? ›

There are dwarf varieties 6 to 12 inches tall and wide, and others grow up to 4 feet tall and 1 to 2 feet wide.

What soil conditions do zinnias like? ›

Zinnias thrive in hot, dry conditions, so grow them in well-drained soil in a sunny border. Single-flowered varieties are attractive to pollinating insects, particularly hoverflies.

Do zinnias need deep soil? ›

"Whether seeding directly in beds or germination trays, zinnia seeds should be sown to a depth of a quarter of an inch into deep, loamy soil," she says. "The distance between seeds or seedlings in the beds should be about six inches apart for good airflow and rows should be spaced 12 inches apart."

How do you plant zinnia in pots? ›

How to Plant Zinnia Seeds in a Pot : Garden Seed Starting - YouTube

Can zinnia grow indoors? ›

Zinnias are a popular annual in the flower garden. You can grow zinnias indoors if you grow them under fluorescent grow lights or in a greenhouse. Choose one of the many shorter varieties of zinnias so the pots won't topple as the mass of the top growth surpasses the combined mass of the pot and its soil.

How deep do zinnias need to be planted? ›

It takes air and soil of more than 70 degrees Fahrenheit to germinate well, so wait until spring to plant zinnia seeds. Plant them about 1/4 inch deep right in the ground, spaced as much as your chosen variety needs, anywhere from a couple of inches to a couple of feet.

How do you keep zinnias from falling over? ›

Insert the stakes close to the plant stem, being careful not to injure the roots. When staking zinnias, you must sink the stakes into the ground far enough to be firm. Then tie the zinnias to the stakes, using soft material like twine.

How many zinnia seeds are in a hole? ›

Plant seeds 1/4" deep and 24” apart, using 3 seeds per hole. Keep the soil evenly moist until the seeds germinate in 8 - 10 days. Once the seedlings reach 2", thin out so you have individual plants spaced 24” apart. Water regularly allowing the soil to go nearly dry between each watering.

Why are my zinnias not blooming? ›

Water Them Correctly. Zinnias need moist but not soggy soil, and ensuring they get the correct amount of water is a great way to keep the plant healthy and producing those blooms.

Will zinnias self seed? ›

Will Zinnias Reseed Themselves? The short answer here is yes. If zinnias are allowed to flower and set seed and the seeds drop to the soil, then there is a good chance that the seeds will germinate and grow the following spring.

Do zinnias multiply? ›

Zinnias are cut-and-come-again plants, so the more you cut from them, the more they'll produce for you.

How often do zinnias need fertilizer? ›

All you need to do is apply it once every 6 months. That's it! Not only this, but it works with all zinnia, indoors, outdoors, and even in gardening containers.

Can zinnias be overwatered? ›

Can you overwater Zinnias? No, Zinnias can't take a lot of water. Zinnia becomes easily prone to fungal infections if it's exposed to waterlogged conditions for too long. Water your Zinnias only when the soil has gone completely dry.

What keeps eating my zinnia? ›

Aphids, caterpillars, slugs, earwigs, and beetles are the most common culprits that eat your zinnia leaves.

How do you make bushy zinnias? ›

What you want to encourage in your zinnias is more of a compact, bushy plant as opposed to a long, lanky one. Cutting them back when they are about a foot tall, tells the plant to send up multiple stems from below where the cut was made, resulting in more blooms throughout the season as well as longer stem length.

Should you water zinnia seeds after planting? ›

After the seeds have sprouted, you still need to water more frequently while the zinnias are young plants. Zinnia seedlings will benefit from daily watering while their root systems are getting established. The roots will only go a few inches deep into the soil, so they need readily accessible water.

Can zinnia grow in shade? ›

Zinnias can grow in partial shade, where they receive only six hours of sunlight per day. Zinnias planted in partial shade may be shorter and have fewer blooms than those planted in full sun, but they will still produce flowers for pollinators and cutting for bouquets.

Is it hard to grow zinnias? ›

Growing Zinnias From Seeds

Growing zinnias from seed might be one of the easiest gardening tasks of the year. Where spring warms up early, wait until the last frost has passed before directly sowing zinnia seeds outside. Plant the seeds only about ¼-inch deep. You'll see seedlings sprout in four to seven days.

Is zinnia an annual or perennial? ›

Zinnias are one of the few plants that are true annuals, meaning they do not come back every year. You will need to plant new seeds or starts every growing season. They can withstand some of the worst growing conditions but make sure to give zinnias full sun.

Do zinnias multiply? ›

Zinnias are cut-and-come-again plants, so the more you cut from them, the more they'll produce for you.

How far apart do you plant zinnias? ›

Sow and Plant

Poke seeds into the soil about one-half inch (1 cm) deep and 3 inches (8 cm) apart. Thin to 12 inches (30 cm) apart in all directions for dwarf varieties. Zinnia varieties that grow more than 24 inches (60) cm) tall require 18 inches (45 cm) between plants.

How long do zinnias last in the ground? ›

The blooming season for zinnias generally lasts about two months. With a bit of planning, you can turn that two-month window of blooms to four months or more with succession sowing. Succession sowing is vital to keeping your garden full of blooms for as long as possible.

Why can't I grow zinnias? ›

Blooms produced by zinnias require a great deal of energy from the plant. Because of this, zinnias thrive best in full sunlight, requiring six or more hours per day. Too little sunlight for too long will prevent new zinnias from germinating and seedlings from developing.

How many flowers do you get from one zinnia plant? ›

Avg. 20–30 stems per plant, though this can vary depending on how long you cut your stems. MARKETING: Zinnias can be bunched and sold separately by color or variety or they can be used in mixed bouquets. Zinnias look very nice in 10-stem bunches.

How many flowers does a zinnia plant produce? ›

People like using zinnias in bouquets because each stem usually grows just one flower at the top. Still, one can never have enough of these stunning blooms, and one of the best ways to get more is through pruning.

Are coffee grounds good for zinnias? ›

5 Tea or coffee grounds-by adding these to your soil it with acidify the soil or acid loving plants(you can also use aluminum sulfate) Azaleas, Rhododendrons and Blueberries, Hydrangeas-will change the color from pink to Blue. If you add 1/4″ of grounds once a month you will keep the ph of the soil on the acidic side.

How many zinnia seeds are in a hole? ›

Plant seeds 1/4" deep and 24” apart, using 3 seeds per hole. Keep the soil evenly moist until the seeds germinate in 8 - 10 days. Once the seedlings reach 2", thin out so you have individual plants spaced 24” apart. Water regularly allowing the soil to go nearly dry between each watering.

How tall do zinnias get? ›

Thumbelina zinnias will continue growing up to 6-8 inches or more, depending on the mix, which can include shades of pink, purple, orange, red, yellow, and lavender.

What happens if you plant zinnias too close? ›

What happens if you plant zinnias too close together? Planting zinnias too close together can increase the risk of diseases such as powdery mildew and leaf spot as well as create competition for resources such as sunlight and water among the plants.

Will zinnias self seed? ›

Will Zinnias Reseed Themselves? The short answer here is yes. If zinnias are allowed to flower and set seed and the seeds drop to the soil, then there is a good chance that the seeds will germinate and grow the following spring.

Do zinnias bloom all summer long? ›

Zinnias are a summer garden staple for good reason. They come in a wide range of colors, bloom all summer long, and are easy to grow. Even beginners can grow loads of beautiful zinnia blooms.

Why are my zinnias not blooming? ›

Water Them Correctly. Zinnias need moist but not soggy soil, and ensuring they get the correct amount of water is a great way to keep the plant healthy and producing those blooms.

How often do zinnias need fertilizer? ›

All you need to do is apply it once every 6 months. That's it! Not only this, but it works with all zinnia, indoors, outdoors, and even in gardening containers.

Do zinnias need a trellis? ›

Staking zinnia plants helps to protect them from strong winds and rain. When slim-stalked annuals get tall, they run the risk of getting knocked right over by inclement weather. Providing support for zinnias also helps keep them off the ground.

Videos

1. How To Grow Big, Beautiful Zinnias From Seed
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