The appearance and type of zinnias, which come in single and double flowers and grow from eight inches to four feet tall, vary widely. There are zinnias with flowers that resemble dahlias, cacti, beehives, and buttons.
The flowers come in a variety of hues, including white, yellow, pink, red, lavender, and green. The lovely plants are preferred because they attract butterflies, which are important for garden pollination. No matter what variety of zinnia you cultivate, it will require a position with full sun because it will encourage the plant to blossom more and develop healthily.
Instead of heavy, deep garden soil or clay soils, zinnias require well-drained soil. Turning and loosening the soil in the bed where you intend to plant zinnias, adding compost to increase organic matter and peat moss and sand for drainage are all necessary soil preparation steps.
Planting Zinnias
The majority of the time, zinnias are sown as seeds outside because they thrive in warm climates and bloom for a long period of time throughout the growing season. After the last date of frost, they can be planted in the ground or in the garden.
Additionally, you can grow zinnias indoors from seed by sowing them in flats or a seed-starting medium four to six weeks prior to the last anticipated date of frost. Keep them at a temperature of between 75 and 80 degrees Fahrenheit and under artificial lighting. In 6 to 10 days, seeds ought to start to sprout.
In the spring, wait to plant seedlings outside until the weather is consistently warm because they suffer in colder climates. You won’t need to bother about saving seeds or transplanting most zinnias the following year because they typically reseed themselves pretty successfully.
Zinnia Care
Because zinnias are heavy feeders, plan to fertilize them frequently and regularly to promote lush, vibrant blooming. For the first spring planting treatment, use a balanced 10-10-10 or 6-6-6 fertilizer and apply about one pound per 100 square feet.
Zinnias will bloom well into the fall if you fertilize them, so you can apply another dose of fertilizer in the middle or late summer. All zinnia varieties benefit from deadheading, or pinching off the dead flower blossoms. If you want to encourage yours to grow into a bushy, compact form, you can also pinch off the growing tips that try to shoot upward.
Alternately, plant your zinnias closer together and nip off lower shoots to promote tall growth if you want to cultivate them with long stems for cut blooms. Regularly water zinnias to keep the soil moist, but do not overwater. In hot climes, drink more water.
Zinnia Pests & Diseases
Powdery mildew is zinnias’ most frequent issue. Make sure there is adequate airflow around the plants and that they are not too close to one another to avoid it. Since mildew prefers chilly, moist environments, water during the day rather than at night.
To avoid water sitting on leaves and stems, water carefully, directing the water into the soil at the plant’s base. Since powdery mildew is so prevalent, some zinnia producers also apply fungicide as a prophylactic measure before it appears.
Additionally, hybrid zinnia cultivars that are resistant to mildew are now available. Alternaria, often known as leaf spot, can also affect zinnias but can be avoided with enough airflow and routine deadheading. To stop the spread of disease, you should also pinch off any infected, dying, or damaged plant parts and throw them away.
Aphids and spider mites are the two insect pests that are most likely to affect zinnias. Pick them off by hand, or use a focused stream of water from a spray bottle to wash them off the pants. Do this during the day so that any leftover water quickly evaporates. Insects can be controlled with routine fertilization and watering.
Watering helps combat hot, dry weather, which fosters ideal circumstances for bug pests, while fertilizer fortifies the plant.
Need zinnias fertilized?
It’s hot outside, so gardening in the summer calls for plants that are minimal care, drought and heat tolerant, and have vibrant colors.
The better, the brighter.
On each of the three criteria, zinnias were suitable. plus more. They’re among the best flowers that savvy gardeners may use in their gardens, in fact.
If there is a flower that is simpler to grow, please let us know. Since zinnias are annuals, their life cycle from seed to flower to seed is short. Simple garden preparation is all that is needed for zinnias’ arrow-like, pointy seeds to germinate. Simply place them in soil that is well-drained, in full sun, and in an area that receives a lot of summer heat, and you’ll soon see small seedlings and blooming flowers. No enduring can boast of that speed!
One gardening buddy just scatters seeds wherever she wants a few zinnias, watered those areas for a few days, and then lets the zinnias’ naturally easy-to-grow nature take its course.
“Candy Cane,” “Green Envy,” “Persian Carpet,” and “Pop Art.” When a variety has names like those, color is guaranteed. The ridiculous color palette of zinnias includes every vivid and pastel shade (aside from blue), as well as bi-, tri-, and crazy-quilt combinations made for cutting, luring pollinators, etc.
Many new zinnia series give options for height and width in addition to vibrant color.
- While Zinnia elegans tall varieties continue to be the preferred option for the back of the border, shorter series are now challenging the low ground once held by marigolds and petunias. The Thumbelina Series of dwarf zinnias reach their highest point at 6 to 8 inches, whereas the Magellan Series remain roughly knee high at 14 inches.
- The Crystal Series and other creeping or spreading Zinnia angustifolia are a revelation for the front of the border, raised beds, containers, and even ground coverings. The fact that its native to Mexico is even more drought tolerant than regular zinnias makes it the preferred choice for hot locations like sidewalk beds or that no-man’s-land next to the garage.
- With a height of about 8 to 12 inches, ZaharaTM zinnias are renowned for their resistance to powdery mildew and leaf spot (see below). In the entry beds of the Regenstein Fruit & Vegetable Garden, we paired Zahara Yellow, which is brief but sweet, with tiny sunflowers.
Zinnias are obviously meant for the vase because they have style and long, sturdy stems.
The words stars and daisies, dahlias and spiders, buttons and domes, and quill-leaf cactus are all used to describe zinnia blooms. Flowers come in different varieties: “singles,” which have their petals arranged in a row around an open center; semi-doubles; and doubles. Each one is fantastic in floral arrangements.
The best zinnias for cutting are, of course, the tall kinds; “Benary’s Giant” is renowned for its three-foot-tall, robust stems and huge flowers. Just above a bud joint, angle-cut zinnia stems. Zinnias often stay a long time in a vase; thus, remove all but the most obvious leaves off the stems before placing them in water.
Zinnias require little upkeep. Because they grow quickly, they shade out weeds. They don’t need mulching, and the only fertilizer they need is an occasional application of a well-balanced mix.
Deadheading encourages the growth of additional blooms. Lack of time to deadhead? When it comes to a big bed, the Zaharas indicated in the sidebard are a significant time saver.
The Profusion Series, a cross between Z. elegans and Z. angustifolia, is resistant to powdery mildew, which is the bane of zinnias, just like Zaharas.
Zinnias are accustomed to dry environments because they are indigenous to the grasslands of the southwestern United States, Mexico, and South America. However, wet summers, like the one we’ve had so far, can be damaging. And leaf spot and powdery mildew can result from that. Three recommendations for surviving inclement weather:
- Only water as necessary, and then only at the plant’s base. Wet leaves can encourage the growth of mildew, and water splashing can instantly spread fungus from the ground onto zinnia leaves.
- Taller, mildew-prone kinds can be hidden by foreground plants.
- As one horticultural put it, “Even when zinnias are coated in powdery mildew, they’re covered with flowers,” do both #1 and #2 and accept that zinnia leaves (but not flowers) are impacted by wet weather.
Zinnia seeds can be saved with ease. Simply let the blossoms to completely dry on the stalk, gather the seedheads, and delicately crush them in your fingers to release the harvest of seeds for the following year. In the same manner as other seeds, store in a cool, dry area. (And save some for our seed swap in February of next year in a labeled envelope!)
Last but not least, zinnias attract butterflies, so plant them every year. The plants with larger flowers serve as landing places for butterflies looking for nectar. (The same is true with hummingbirds.) To capture the most attention, try tall zinnias with scarlet or hot pink blossoms.
Living and gardening in Oak Park, Illinois, Karen Zaworski is a writer and photographer who specializes in gardens.
‘Benary’s Giant,’ one of the greatest for cut flowers, stands out in the English Oak Meadow with its 1,000 blooms.
Above: Double Zahara Fire (Zinnia marylandica), one of a group of plants resistant to powdery mildew, was cultivated in the Enabling Garden.
For your summer garden, the ZaharaTM Coral Rose Zinnia (Zinnia Marylandica) excels and requires little water.
How frequently should you fertilize zinnias?
- Fertilize every 4 to 6 weeks during the growing season (before zinnia buds emerge).
- You should cease fertilizing your zinnia once it blooms and the petals start to fall off the plant.
Slow-Release There is less need to apply fertilizer. Loamy soil also requires less frequent fertilizer application.
Apply liquid fertilizers once a week. If your soil is sandy, you should also apply fertilizer more liberally.
Last but not least, alternate fertilizing throughout the flower gardening season. This will offer the ideal nutritious blend in the proper amount. If you only use one fertilizer, you run the risk of giving your zinnias too much of one nutrient, which will kill them.
Miracle Gro, do zinnias like it?
Give your zinnias lots of water after planting them. Give zinnias a deep soaking several times a week once they have settled in and reached maturity because they appreciate damp soil. But don’t overwater!
Your watering plan can always be modified based on how wet the soil is UNDER THE SURFACE. You can do it manually or purchase a soil moisture meter. To detect moist soil, extend your finger all the way to the second knuckle.
When watering your containers, remember that they will require extra water because they dry out quickly.
To get your zinnia plants to blossom larger and more frequently, add fertilizer. When planting a mature zinnia for the first time, you can add fertilizer to your soil. I’ve used Miracle-all-purpose Gro’s fertilizer, but Dr. Earth fertilizer is new to me.
Both are excellent. Simply keep in mind to fertilize a damp plant. Fertilized plants that are dry can burn and perish. Believe me, I’ve experienced this with my plants previously!
Is Epsom salt helpful for zinnias?
Follow these tips for a fruitful crop:
- Maintain the media pH between 5.8 and 6.0 during the plug stage.
- At 75 F, radicle emergence will happen in three to four days; lower the temperature to 70 F during the day and 65 F at night.
- Once genuine leaves start to develop, reduce moisture levels to medium.
- Apply 100 to 150 ppm of nitrogen when fertilizing using formulations based on calcium nitrate.
- As facultative short-day plants, zinnias (FSDP). In short conditions, plants may flower in 15 to 18 days after planting; daylengths less than 11 hours will speed flowering. Night interruption of four hours will assure early vegetative growth rather than flowering too early.
- Keep the EC of the soil between 1.25 and 1.5.
- Feed plants with fertilizer that has 200–250 ppm nitrogen and is nitrate-based.
- Interveinal chlorosis could be a sign of a magnesium deficit; add MgSO4 (Epsom Salts) at a rate of 16 ounces per 100 liters.
- Zinnias may flower too soon if they are grown in an unbalanced or excessively dry environment.
- Recommendations for PGR:
- It is advised to use daunozide, paclobutrazol, and ancymidol; follow the label’s instructions for dosage and administration techniques.
- To regulate growth and tone the crop, use a negative DIF of 5 to 15 degrees.
- Zinnias are susceptible to boron deficiencies, which manifest as leaf edge burn, crinkled leaves, and tip abortion. Along with every fertilizer treatment, add 0.25 ppm of boron.
How can zinnias be kept in good health?
One of the simplest flowers to plant, zinnias grow quickly and provide a lot of blooms. Additionally, they will continue to bloom right up until the first fall hard frost. Consider trying zinnia flowers this year to add a huge splash of color to your yard.
About Zinnias
Since zinnias are annuals, they will only produce blooms and seeds for one season before dying. The original plant will not reappear the following year. They are excellent for use as a cutting flower or as food for butterflies since they have vivid, solitary, daisy-like flowerheads on a single, tall stem.
Types of Zinnias
Zinnia elegans, the most widely grown zinnia species, has been developed to produce a large number of distinctive variants.
Single, semidouble, or double zinnia blooms are the three most common varieties. The number of petal rows and whether or not the flower’s center is visible serve to distinguish between these forms:
- A single row of petals and the center are both visible on single-flowered zinnias.
- Petal rows abound on double-flowered zinnias, and their centers are hidden.
- Between the two are semidouble-flowered zinnias, which have several rows of petals but discernible cores.
In addition to these shapes, zinnia flowers also occur in “beehive,” “button,” and “cactus” forms. Additionally, the plants themselves come in various heights: taller types function best as a garden bed’s background, while shorter varieties are useful as a border. There is a zinnia for every garden, in fact!
In an annual or mixed border garden, plant zinnias. Smaller zinnias work well as window boxes, edging, or in other containers.
To have a lot of flowers all season long, choose a place that receives full sun (6 to 8 hours of sunlight every day). Additionally, later in the season, foliar diseases like powdery mildew can be avoided by planting in an area with sufficient air circulation.
Although zinnias can grow in a variety of soil types, they prefer organically rich, well-draining soil. The optimal pH range for soil is between 5.5 and 7.5. The blooms will grow more quickly if compost (humus) is added to the soil. Find out more about soil improvements and getting the soil ready for planting.
When to Plant Zinnias
- Because they dislike being transplanted, it is advised that you start your zinnia plants from seed directly in the garden bed. If the correct circumstances are present, they will develop quite quickly from seed.
- It should be noted that zinnias can be grown from seed inside if you like. Just make sure to transfer them gently and young.
- Because zinnias are delicate to frost, wait to plant them until after the last frost in your area. See the frost dates in your area.
- Zinnias can tolerate daily temperatures as low as 60F (16C), although a range of 7484F (2328C) is ideal.
- To prolong the flowering time, sow a new crop of seeds every week or so for a few weeks.
How to Plant Zinnias
- Depending on the kind, place plants 4 to 24 inches apart. (Many common kinds are planted 2 feet between rows and 6 inches apart within the row.) For information about each variety, consult the seed packet’s back.
- Plant zinnia seeds no deeper than 1/4 inch.
- The majority of zinnia cultivars will produce seedlings in just 4 to 7 days, but it may take up to two months or more for blooms to appear (depending on planting site and climate).
- To promote air circulation, thin seedlings when they are three inches tall, spacing them 6 to 18 inches apart. As a result, powdery mildew is less likely to grow.
- To promote development and blossoms, keep the soil’s moisture level moderate and apply a mild fertilizer.
- Deadhead zinnias once they have finished blooming to facilitate the development of new blossoms.
- Since zinnias are annuals, they will perish with the first fall hard cold. Let the final blooms of the season fully mature before dispersing their seeds if you want them to reseed.
Zinnias still not your thing? In your garden, try them out for the following six reasons:
- With cultivars from the Dreamland Series, you can have a full-sized flower on a little plant. These zinnias are compact and dwarf, with stems that are 812 inches tall and totally double flowerheads that can be up to 4 inches across with a variety of colors.
- The dwarf, spreading cultivars of the Thumbelina Series have weather-resistant, solitary or semi-double flowerheads in a variety of hues. Their stems can reach a length of 6 inches, and their petals are 1-1/4″ wide.
- One of the largest and tallest of them all, the State Fair Series has huge, double flowerheads that measure 3 inches in diameter. Stems can reach a height of 30 inches.
- Typically, it takes zinnias 60 to 70 days from seed to flower (though it depends on conditions and variety). They are fantastic in a bunch of flowers!
- The tiny, narrow-leafed zinnias are great for hanging baskets and also make lovely dried flowers.
- Zinnias are considered to represent memories of those who have passed away. Discover more about the significance of flowers here.
- Zinnias may be harmed by bacterial wilt, powdery mildew, and bacterial and fungal spots. To prevent illness, keep leaves from getting too damp and correctly space your plants.
- Problems can also be brought on by caterpillars, mealybugs, and spider mites. Spraying should be avoided unless there is a real infestation because some leaf damage is not a problem.
- Thanks to their resistance to deer, zinnias may be able to prevent surrounding flowers from being eaten.