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:
How are potted zinnias cared for?
Container Care and Upkeep for Zinnias Make sure they receive plenty of sunlight throughout the day since more flowers will grow as a result. When the dirt has dried to around the first inch (2.5 cm), water the pots. To avoid standing water or wet roots, make sure the container has drainage holes.
Do zinnias prefer shade or the sun?
Light: Full sun is ideal for zinnia growth and flowering. Even in warmer climates with afternoon shadow, they can flower there, but they may be more prone to disease and produce fewer flowers.
Soil: Organically rich, fertile soils with good drainage are ideal for growing zinnias. Because zinnia seedlings are susceptible to rotting in cool, damp soils, having well-drained soil is crucial.
Plant zinnia seeds in rows or clusters spaced a few inches apart. Once the plant has four leaves, thin to 8 to 18 inches apart, depending on the variety.
Planting: Plant zinnias in the spring, just about the time you plant tomatoes, when all threat of frost has passed. Growing zinnias from seeds straight in the garden is simple. Start seeds inside four to six weeks before to your last frost date for earlier flowering.
Do zinnias regrow after being cut?
The extreme heat and dry conditions have forced many growers to scramble to tend to and harvest their stressed fields and gardens, including here on our farm in the Skagit Valley and throughout much of the Western United States. While many flowers bloom profusely in this kind of weather, it is crucial to know the optimum times to harvest and ways to care for your fresh cut blooms immediately after they are cut if you want your flowers to last as long as possible—especially with the added stress of high temperatures. (This is referred to as “stage of harvest” and “post-harvest handling” in the language of flower farmers.)
Here are some of my favorite hints for avoiding heat waves and getting the longest vase life possible from 10 high summer flower varietals.
Zinnias: To ensure a long vase life, zinnias must be harvested at the proper time. Wait too long, and the blossoms will swiftly fade; harvest too soon, and the stalks will sag and droop. The “wiggle test” is a pretty easy way to determine whether your zinnias are ready for harvest. Simply take hold of the stalk a few inches below the flower and gently shake it. The stem will be delicate and flexible if it is young. When you wriggle the stem, it should stay rigid and straight if the plant is ready to be harvested. Cut time has come! To create a long, sturdy stem, deeply cut the plant. Don’t be hesitant to clip off lateral sprouts on the main stem you just plucked; remove the foliage as well. Because zinnias are “cut and come again” flowers, they will continue to grow all season long even after being severely pruned.
We cut zinnias and place them directly into clean, fresh water that has either been supplemented with a drop of chlorine or a CVBn pill. The little conditioning pills, which are frequently marketed for gerber daisies, are actually ideal for all of the “dirty flowers with hairy stems that easily gather dirt and bacteria that can muddy up the water.” The hottest time of the year is when zinnias blossom continuously, and they also enjoy heat throughout the post-harvest period. One of the few flowers we don’t treat in the cooler before delivery or design work is this one. Simply said, we keep them out of direct sunlight in a dark, shaded area of our studio. These few easy steps will give you gorgeous, long-lasting blossoms that last 7–10 days in a vase.
Note: In general, certified organic agriculture does not permit the use of commercial flower food. Using bleach or hot water and harvesting at the right stage are crucial if you have certification. To give your flowers the longest possible vase life even if you are not certified organic, CVBn tablets and other hydration and conditioning options are worth the extra money.
Basil: During the height of the summer, we nearly always add at least one or two stems of Cardinal, Oriental Breeze, Lemon, or Cinnamon basil in our mixed bouquets of flowers for grocery store clients. When the flower heads start to appear and the stems start to harden, I pick the basil. To keep them from wilting, I treat them with Quick Dip (a non-organic alternative) or boiling water (an organic alternative). As these plants wilt quickly, be cautious to harvest them in the cool of the morning or evening. Basil doesn’t like the cold, just like zinnias, so keep them out of the refrigerator to finish their conditioning. The vase is frequently where stems root, and they should last 7 to 10 days.
The fuzzy, aromatic leaves of scented geraniums are a must-have for bouquets, but if you don’t take a few simple precautions, they could wilt easily. In order to avoid the heat of the day, I always attempt to trim the scented geraniums first thing in the morning. I sliced them, placed them in cool water, and gave them 3–4 hours to rest and condition before arranging them. Dip the bottom 2-3 in boiling water for 5-7 seconds or dip the stems in Quick Dip if they are still wilting.
Another flower that is prone to wilting is the hydrangea. Perhaps more significant than the harvesting stage is how you hydrate the produce after it has been sliced. My secret is to cut them when they are still chilly, use Quick Dip quick hydration solution, or cut them into hot water for organic production. I am familiar with some flower growers who swear by dipping the just-cut stems in alum powder (found in the grocery store’s spice aisle), while others would soak the entire bloom in water before use to prevent wilting.
Cosmos: Cosmos generally don’t have a very long vase life, but if you cut them at the proper point, you can extend their beauty. Cosmos should be cut when just one petal is beginning to unfold, and once that happens, let the vase’s other buds and blossoms bloom.
Sunflowers: Harvesting the blooms just as the first few petals begin to lift off of the central disk and removing all but the top few leaves will give your sunflowers the longest vase life possible. This can be challenging for beginners since it still appears to be “closed” and not ready to pick, but if you cut them early, you can prevent bug damage and enjoy longer vase life. These people, who are referred to as “dirty flowers,” may benefit from some bleach in the water or from being cut into a pail of water that has been CVBn-treated.
Celosia: When harvesting crested celosias, also known as “cock’s comb,” wait until the crests are fully grown (or a bit sooner is good too), but before the plant begins to produce seeds. Before plucking celosias with feathers, let them stretch and become feathery. Make sure to remove around 3/4 of the leaves after cutting and submerge them in cool water.
Cerinthe: Harvest during the coldest part of the day, then immediately treat stems by putting the bottom 2-3 inches in boiling water for 7–10 seconds, followed by a cool water bath. After harvest, stems become extremely floppy, but once hydrated, Cerinthe can last up to a week in a vase.
Harvest rudbeckia when the flowers start to unfold. Black Eyed Susans are infamous for fast turning their water murky. By reducing this and extending their vase life, you can expect a vase life of 7 to 10 days by adding a few drops of bleach to the water.
If you have any more advice or methods for gathering high summer blossoms and extending their vase life, please let me know. Please share any more advice in the section below.
Why are the zinnias in my pots dying?
Alternaria leaf spot disease and bacterial leaf spot disease are the leading causes of zinnia deaths. Your zinnias can also perish from powdery mildew. A prolonged wet environment or overwatering could potentially cause zinnias to perish.
Growing zinnias is done for their stunning, multicolored flowers. In the USA, they are passionately grown.
In the garden, zinnias are simple to grow. The plants do occasionally experience problems. Let’s examine the problems and possible solutions.
My zinnias keep dying; why?
Now that you are familiar with zinnias and their popularity, let’s explore the potential causes of your zinnias’ potential garden difficulties. There are numerous reasons why this occurs, and each of them is normally treated differently. Your plant might or might not be able to be saved, depending on the reason why your leaves or blossoms turned brown. Let’s examine each reason in more detail, along with possible solutions.
Alternaria Leaf Spot or Blight
Your plant may have been infected by the fungus Alternaria zinniae if you start to see small, dark, round, reddish spots with white to grayish-white centers on the leaves of your zinnias. Unfortunately, a wide range of flowers are impacted by leaf spots.
These patches will enlarge, take on an uneven shape, and change color from dark red to dark brown or purple. On the interior of the diseased lesion, you could detect dark, concentric circles. As the plant tissue begins to decompose, the spots may eventually turn into holes.
Alternaria leaf spot can cause severely infected zinnia plants to swiftly lose their green leaves and turn brown and shrivel. Brown lesions may also appear on the stems. If stem lesions are severe enough, they can girdle the stem, which will cause the upper part of the plant to wilt and eventually die off since the circulatory system is cut off.
How to Fix:
If they are minor or moderate, fungal infections in Zinnias may usually be handled. Use horticultural oils, such as jojoba or neem oil, to solve the issue. If less effective solutions like neem oil are unsuccessful, a commercially available fungicide can potentially be a possibility.
Powdery Mildew
The fungus that causes powdery mildew is highly prevalent on zinnias in the late stages of the growing season. The leaves will develop a white, powdery growth that will eventually cover the stems and blooms. Typically, powdery mildew spreads up the plant.
At the plant’s base, severely affected leaves start to turn brown and eventually die. Plants that are severely affected will become weak and stop growing.
Like blight, powdery mildew can be treated with neem oil or a commercial fungicide. However, it works best when applied early in the season, before powdery mildew has a chance to develop. You might be forced to pull your badly affected plants and replant them if that is your only option.
Cercospora Leaf Spot
Cercospora leaf spot and Alternaria leaf spot resemble one other strikingly, making them readily confused. Both Alternaria leaf spot and cercospora leaf spot can frequently happen together.
The fungus Cercospora zinniae is what causes cercospora leaf spots, which are rather large, circular, dark purplish, with gray to gray-white centers. As rot advances, the plant tissue may come loose from the cores. Leaves that have been severely diseased will quickly turn brown and shrivel.
A commercial fungicide is used to treat the fungus that causes leaf spot. Neem oil also has potential. When compared to other fungal illnesses, leaf spot is often easier to treat, and if caught early enough, your plant will have a greater chance of surviving.
Lack of Water
Zinnias don’t need a lot of water at first, but there comes a time when they do. It’s probably due to a lack of water if you’ve been facing drought conditions and your zinnias are beginning to perish.
Wilting is one of the first indications that your plants aren’t getting enough water. If the situation is not fixed, the leaves will droop, shrivel, and eventually start to turn brown and die. If the plant is given enough moisture to recover, wilting can be swiftly reversed.
It is probably too late to save the plant if it has already started to turn brown and die from a lack of water. Drought stress can have long-lasting and irreversible consequences on a plant’s growth, even if it survives.
Set up a regular watering routine. Changing your watering regimen should bring them back quickly as long as the plant isn’t going brown. If the leaves on your zinnia are brown and crispy, it’s probably too late to salvage it.
Waterlogged
More frequently, zinnia plants can also become waterlogged and experience problems. Why does this matter? It indicates that either the soil is not draining properly or that the soil has received too much water. While water is essential for plants, oxygen is also necessary for plant roots.
When the soil is waterlogged, the pore space—the area between soil particles—is completely filled with water, leaving the plant roots with little to no access to oxygen. The roots will start to deteriorate from a lack of oxygen, and you’ll start to see the edges of the plant leaves turning brown.
If you’ve been routinely watering your zinnias and you realize this is happening, stop. Drain the soil, please. Always pick a spot in your garden that has good drainage when planting zinnias to avoid problems from wet circumstances.
Since too much water can also be a problem, the answer is similarly straightforward. Avoid overwatering them or amend the soil to make it more permeable. In essence, a plant that is soggy is drowning. The solution is usually as simple as adjusting our water routine.
Frost
Zinnias enjoy heat. They are an annual that enjoys the summer! They therefore don’t withstand the majority of cold temperatures, like many annuals. Your zinnias will continue to bloom long into the fall, but suddenly the first frost of the year will arrive.
Your zinnias will abruptly turn brown overnight as a result of the freezing temperatures when that occurs. Your zinnias are probably done for the season if the frost wasn’t too severe or if another frost doesn’t come around for a while. However, this is not always the case. After all, everything nice has to end.
There isn’t a genuine technique to stop zinnias from disappearing in the winter. Covering the plants in the winter when it becomes too cold is the best approach to prevent severe frost damage. Depending on your environment, your flowers won’t normally blossom past October.
Setting Seed
Zinnias are annuals once more. This indicates that they go through their entire life cycle in a single season or year. The seeds will begin to sprout in late spring, the plant will start to blossom in the summer, and when it has bloomed profusely, it will start to set seed.
Gardeners can prevent this by deadheading the faded flowers to encourage new blooms, but occasionally we could miss a few blossoms or perhaps we’re not bothered with that level of upkeep.
Up until the entire flower head has turned ugly, crunchy, and brown, you’ll see that the flower petals will fade away and turn brown. Not to worry! Simply grasp this withered flower head and gently press it between your fingertips. There are a large number of brown zinnia seeds. One of the few instances when your zinnias turning brown is beneficial is right now!
The life cycle of the zinnia includes setting seed. There isn’t really a cure for this because annual plants finish their life cycle in a full year. However, when it does, it can help you initiate more spring flowers and is actually a wonderful thing!