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.
When may I transplant my zinnia seedlings outdoors?
It is preferable to begin them at 4-6 weeks as opposed to 6-8 weeks. Make sure to transplant zinnias after the spring frost risk because they are not frost hardy. After your spring frost date, plant out 2-3 weeks later.
Are zinnia seedlings good at transplanting?
By: Garden Gate employees Direct-sown seedlings are simple to move from one area of the bed to another, regardless of whether you planted too near, experienced sporadic germination, or water washed seeds together. These compact clusters of zinnia seedlings won’t cover the garden bed evenly.
What degree of cold can zinnia seedlings endure?
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.
- Sow a round of seeds every week or so for several weeks to extend the flowering period.
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.
Can zinnia seedlings be planted deeper?
Turn the heat mat down or off if your seedlings appear to be getting lanky when you are using a seedling heat mat to start seeds inside. Warmth can stimulate seedlings to grow more quickly while also accelerating seed germination, which is fantastic. Let’s not encourage seedlings to grow even taller when they already appear to be on the lanky side. Naturally, this suggestion is in addition to greater lighting.
These seedling heat mats with an integrated thermostat control and temperature probe are something we personally adore using. We programmed our heat mats to activate only when the soil temperature falls below 65-70F after germination. In the winter and early spring, when it may get pretty chilly at night but also extremely warm during the day, this keeps our heat-loving summer crop seedlings (tomatoes, peppers, basil, flowers, etc.) happy in our greenhouse. The similar setup works well for growing seedlings indoors, in a garage, or anywhere else.
(3) Restart
Please bear with me on this. I’m not referring about beginning a fresh batch of seeds after your zone’s seed-starting season is already underway by several weeks or even months. However, starting fresh may be preferable to fussing over leggy seedlings for the remainder of the season if you have enough of seeds and things are already looking sluggish a few days after germination.
As an illustration, the other day I began a couple 6-packs of bok choy seeds in a dark spare room on a heat mat. As soon as they sprouted, I was going to move them to the greenhouse (and under a grow light) and check on them periodically. Well, I neglected to check on them for more than a day, they grew, and they already appeared to be much too tall for my taste. In order to use the leggy seedlings as the “poor example” for this piece, I simply started more bok choy seeds.
4) Strengthen them.
You may very well be able to sow your seedlings even if they are lanky! But first, they must be considerably fortified in advance. They won’t be strong enough to plant outside for a while. Additionally, young, leggy seedlings are typically too delicate to bury deeper in soil without the risk of the stems becoming rotten.
Within a few weeks of sprouting, be cautious to thin your seedlings to just one sprout per cell or container. Thinning lessens competition for nutrients, available area, light, and water, and enhances airflow. Instead than yanking and plucking out undesired sprouts, I always advise cutting them off. The following three methods can help you transform your leggy seedlings from tiny to mighty:
Add movement
Introduce a gentle wind using an oscillating fan to fortify seedlings. Turn it on just loud enough to cause some light shaking and movement, but not too loud. Leggy seedlings benefit from movement by developing stronger, more durable stems. Similar results can be obtained by tickling seedlings with your hands. A fan, however, has numerous advantages! Additionally, damping off and fungus are avoided by enough airflow. Whether or not indoor seedlings are leggy, I always suggest using a fan.
Use mild fertilizer and “water from below
The act of feeding lanky seedlings is another technique to improve their health! You can start feeding seedlings with a very mild liquid fertilizer once they have grown their first pair or two of real leaves (the ones that appear after the first two, which are frequently heart-shaped). Since they do not require or care for fertilizer much younger than that, the seedlings should be at least a few weeks old at this time.
Seaweed extract is what we prefer to feed our seedlings, while fish emulsion is also a common option. Whatever you choose, make sure to dilute it according to the bottle’s directions. The lower tray that the seedling containers are sitting in should then be filled with the liquid fertilizer/water. Whatever the soil need will be absorbed from the bottom. We always advise watering seedlings in that manner, especially the lanky ones. Pouring water in from the top doesn’t give evenly distributed moisture and carries the risk of tipping them over. By encouraging their roots to develop deeply when you water from below, you can grow stronger plants.
Finally, before moving leggy seedlings outside, always harden them off. The process of gradually exposing seedlings that were grown indoors to the environment is known as “hardening off.” This typically entails moving the seedlings outside daily for a week, initially placing them in the shadow for a short period of time before progressively exposing them to more and more direct sunshine. This strengthens the seedlings and better equips them to withstand difficulties like wind, rain, hot sun, or low temperatures. Instructions for hardening off in detail can be found here.
Can you bury leggy seedlings deeper in the soil?
In general, you can put leggy seedlings farther into the ground to help make up for their excessively long stems! When they are still extremely young and sensitive, resist the urge to plant them deeper right immediately. When buried in wet soil, weak, thin, and small stems are susceptible to decay. After completing the above-described procedures to strengthen and/or harden off the lanky seedlings, wait at least a few weeks.
You should be able to bury a piece of the lanky seedling stem once the stems are stronger and more resilient, either by potting them up or moving them outside. Or you could try both! For instance, we use four-seedling pots to begin our tomato plants. The seedlings are then potted up into bigger 8 nursery pots after about a month, and the stem is buried by a few inches at that time. We can bury the stem a few more inches if necessary when we transplant the plants into the garden.
When should zinnia seedlings be pinched?
An armful of zinnias are the epitome of the summer. These cheerful blossoms, which come in a vibrant spectrum of colors, are a must-grow for any flower enthusiast.
Since they are among the simplest cut flowers to raise, they make an excellent first crop for new growers and are a consistent, prolific performer for the majority of flower farms and gardeners.
Since the beginning, we’ve grown zinnias, and each year, I fall more and more in love with them.
Because they dislike the cold, zinnias prefer to be planted once it has warmed up a little. However, in chilly Washington, we start our plants in 72-cell trays in the greenhouse 4 to 6 weeks before our last spring frost. Many gardeners in warmer regions of the world are successful at direct seeding their zinnias out into the field.
Around the middle of May, after the weather has sufficiently warmed up and any threat of frost has passed, plants are tucked into the field. On our farm, we work to give each blossom the greatest possible start. Find out more about preparing the soil here.
After preparing the planting beds, we install four drip irrigation lines that are spaced about a foot (30.5 cm) apart, and we then cover the beds with a layer of pre-burned landscape cloth to keep weeds at bay. With five rows per bed, plants are spaced 9 inches (23 cm) apart.
Plants can grow enormously large and require some sort of support if given suitable soil and a consistent supply of water. We employ a layer of horizontally stretched Hortonova netting that is 12 inches (30.5 cm) above the surface. Metal hoops that we bent using our Johnny’s Quick Hoops Bender are used to hold the netting in place. Any stake, whether made of wood or metal, will do. As the plants develop, they push through the netting grid and receive the support they require.
Because they prefer the heat, zinnias must be grown in full sunlight. I always grow them in cloth for the extra heat in addition to choose a sunny location.
Since they are cultivated in such rich soil, there hasn’t been a problem with disease, which I was concerned about when we first started planting zinnias this close together. Every two to three weeks, we succession sow zinnias to provide a constant supply of these lovely blossoms throughout the summer.
Pinching your zinnias when they are young is the key to getting the longest stems from them. Here is how to accomplish it: Use sharp pruners to remove the top 3 to 4 inches (8 to 10 cm) of the plant when it is between 8 and 12 inches (20 and 30 cm) tall, right above a set of leaves. This instructs the plant to grow more stems above the point of the cut, increasing both bloom production and stem length. The image up top shows pinching with a different kind of plant.
Deadhead any spent blooms if you don’t routinely pick your zinnias in order to direct the plant’s energy toward growing new blossoms rather than setting seed.
Zinnias must be selected when they are completely ripe in order to stay fresh in the vase. Use the to determine if a zinnia is ready to be harvested “Waggling test Just gently shake the stem while holding it approximately 8 inches (20 cm) down from the blossom head. The stem is not ready to be cut if it droops or bends. It is time to harvest if the stem is rigid and continues to stand upright.
Zinnias are regarded as a “Adding a few drops of bleach to their water will help clean up soiled flowers. Given that the flowers are quite sensitive to cold, do not place them in the cooler.
There are an astonishing variety of zinnias available in every imaginable size, color, and shape. Whatever your requirements, there is undoubtedly a zinnia for you.
Consider how many options there are if you’re looking for flowers in the peach-salmon color spectrum, for instance.
Giant Salmon Rose, Cinderella Peach, and Queen Lime Orange are in the top row, from left to right.