How To Grow Giant Zinnias

Zinnias add a profusion of vibrant hues that scream summer, including pink, red, yellow, green, orange, and white.

The Zinnia family includes flowers in a range of sizes, shapes, and varieties.

After the final date of frost, put seeds outside to grow huge zinnias like this type called Benery’s giant zinnia. Zinnias can be started inside, but since they grow from seed outdoors so fast and easily, I wouldn’t bother.

Do enormous zinnias require support?

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.

How long do gigantic zinnias take to bloom?

Beautiful flowers like zinnias are ideal for novice gardeners! These annual flowers come in a wide range of hues and variations, adding a vibrant pop of color to your yard and making them ideal for bouquet-making. Zinnias require only plenty of sun, warmth, and well-drained soil to thrive and can be grown without much care from summer until the first hard frost in the fall. They don’t have any significant pest issues and can draw lovely butterflies to your garden.

Depending on your location, the growing strategy may change slightly. When the temperature starts to rise, zinnia seeds can be sown immediately into the garden in warmer climates. Here in New England, it takes longer for the temperature to rise, so if you can keep the soil between 70 and 80 degrees F, you can start the growing process about a month before the final frost is predicted. Since zinnias dislike being transferred, sow seeds in peat pots that can be placed straight in the garden. From seed to flower, zinnias normally require two months, though this might vary depending on the weather.

Here are some more hints for growing zinnias:

For your zinnias, choose a spot that is sunny and bright.
Zinnia seeds require sunshine to sprout, so only cover them with 1/4 inch of dirt.
Keep the soil damp while the flowers grow.
Thin seedlings to 6-8 inches apart for small varieties and 1 foot apart for large varieties when they are 2-3 inches tall.
Avoid drowning the zinnias in water. Water intake of 1 inch per week is advised.
To encourage the zinnias to generate more blooms, remove any faded or dead flower flowers. Deadheading is the term for this.

Do enormous zinnias reappear annually?

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.

How far apart should huge zinnias be spaced?

Your choice of zinnia variety and its intended use will determine how far apart to plant them. While larger, giant-flowered types may require up to 18 inches of spacing between each plant, smaller zinnia cultivars used as a border plant or in pots may be planted as close as 6 inches between. If you reside in a hot, humid area, you might think about setting your zinnias apart more to improve air circulation and lower the likelihood of disease.

Do zinnias thrive in containers?

Zinnias provide color to any flower garden, are excellent for cutting, are simple to cultivate from seeds, and are a terrific option for container gardening.

Does zinnia pruning encourage growth?

It’s crucial to clip your zinnia blooms as they appear to ensure that they continue to grow and bloom. 12 Zinnia plants were planted by me at the start of the summer. I probably cut more than 200 to 300 zinnia blossoms from these bushes over the course of the summer. It was great to watch them develop further!

Here are a few recommendations for flower cutting:

Make sure the bloom is prepared to be cut by inspecting the stem. Take hold of the stem above the intended cutting point and shake the flower a little. Give the stem a few more days if it feels flimsy; it has to be strong and devoid of any give.
To cut, cut just above the leaves as seen in the image above, following the stem as closely as you can to the main stem of the plant or where it joins another stem.

Where is the Best Place to Plant Zinnias?

Zinnias grow best in well-drained soil that is rich in organic matter, whether they are grown in raised garden beds, pots, or directly in the ground.

Should You Pinch Zinnia Plants?

Pinching the young plants is the key to creating the best zinnias with the longest stalks. When plants are between 8 and 12 inches tall, cut off the top of the plant, just above a pair of leaves, with a pair of sharp garden pruners.

Should You Deadhead Zinnias?

Deadhead zinnias to prevent fading. Either remove the old blooms once they have faded or cut mature stems to utilize in fresh bouquets for the home. To extend blooming and encourage branching, deadheading and routine harvesting are crucial.

How Long Do Zinnias Bloom?

For the garden, zinnias are a popular cut flower because of how long they bloom. From late spring until the first fall frost, zinnia flowers are in bloom.