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If you're looking for a prolific annual flower for gardens and bouquets in a wide range of colors, try zinnias. The plants range from low growing, to tall and statuesque. Flowers come in all the colors of the rainbow depending on the variety. Group them in a flower or vegetable garden for color and to attract bees and butterflies.
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. Well-drained soil is important because zinnia seedlings can be prone to rotting in cool, wet soils.
Spacing: Plant zinnia seeds a few inches apart in rows or clumps. Thin to 8 to 18 inches apart, depending upon the variety, once the plant has grown four leaves.
Planting: Plant zinnias in spring after all danger of frost has passed, around the same time you'd plant tomatoes. Zinnias are easy to grow directly-seeded into the garden. For sooner blooms, start seeds indoors 4 to 6 weeks before your last frost date.
Growth Habit: Zinnias come in a wide variety of plant sizes. Some are low-growing. 1-foot tall plants with a mounding habit. Others are 3-foot tall plants with big flowers. Plant the right variety for your usage and that your space allows. Mounding varieties have smaller flowers and produce more ornamental looking plants. Taller varieties are often used for cutting and are best grown in rows or clumps for a better visual effect.
Watering: Zinnias need moist soil to grow their best. This is especially true of young plants. Water deeply a few times a week so the soil stays moist 6 to 8 inches deep. Don't overwater because zinnias can also succumb to rot diseases especially on wet, clay soils. Once established, zinnias a relatively drought tolerant.
Fertilizing: Amend the soil before planting zinnias with compost. When flowers start to form, side dress with an organic 5-5-5 fertilizer to get more and bigger blossoms.
Mulching: Mulch zinnias once they are established with a 2 inch layer of straw or bark mulch. This will help preserve soil moisture and prevent weed growth.
Trimming & Pruning: Deadhead (trim) spent flowers regularly to promote more flowering and to keep the plant tidy. To create bushier plants on tall varieties, pinch the growth tip of the plant when young. This will stimulate more side branching, a shorter plant, and more flowers. However, it may delay flowering, especially in cool summer areas.
We've put together two of our favorite annuals in our Zinnia and Cosmos Seed Combo. Plant this easy, vibrant flower duo for endless blooms from summer all the way until frost. You'll...
Pumila Bordeaux Zinnias are part of the 'Cut & Come Again' series, which means the more you cut the full, double blooms, the more flowers you'll enjoy! This heirloom mixture blooms i...
Dahlia Flowered Zinnia Envy will undoubtedly become the envy of your neighborhood with its vibrant, lime-green flowers. This easy-to-grow Zinnia thrives in any sunny spot and is low ...
Giant Cactus Zinnias are a highly sought-after variety and this mixture will delight with unique, needle-like petals on large flowers that can reach 4-5" across! The rich-hued, spiky...
The Zinnia Seed Mix contains four colorful varieties of this long-blooming annual, for a dynamic blend in the garden, meadow or vase. Includes tall, big-blooming California Giants, r...
Blooming from mid-summer until frost, Zinnias are some of the easiest wildflowers to grow, adding their bright, cheerful color to any sunny spot with enthusiasm. These beloved annua...
Zinnia Canary Bird’s name says it all – Large, brilliantly-yellow blooms that are extremely easy to grow and long-lasting. A bright, bold statement in the meadow or garden. Annua...
Cherry Queen gets its name from bold, cherry red blooms that are a true knock-out in the meadow or garden. Gorgeous on its own and paired with other Zinnia varieties. Annual....
Dividing & Transplanting: Zinnias are annual flowers so don't need dividing. However, they can be finicky about being transplanted. If growing them indoors for transplanting, use larger peat or plastic pots so you don't have to transplant more than once. Try not to disturb the roots when moving the plants.
Pests & Disease: The biggest pests of zinnias are powdery mildew disease and Japanese beetles. Powdery mildew disease is especially prevalent in humid areas of the country in late summer. A white film develops on the leaves. Eventually the leaves turn yellow and drop. The whole plant can quickly get infected making it look messy and reducing its overall flowering. To prevent powdery mildew, space plants further apart to increase air flow, grow disease-resistant varieties, and apply preventative sprays early in the season. Neem oil and Serenade (Bacillus subtilis) are two organic sprays that work well to prevent the spread of powdery mildew. You can make your own organic spray by adding 1 tablespoon baking soda to 1 tablespoon of horticultural oil in 1 gallon of water. Aphids also can attack zinnia leaves causing them to curl and yellow. Knock aphids off zinnia leaves with a strong spray of water from a hose.
Japanese beetles love zinnias and are often found feeding and shredding the leaves. To control Japanese beetles, apply beneficial nematodes or milky spore powder in the early summer and fall to kill the c-shaped, white grubs in the soil. These are the larvae of the adult beetles. Use beneficial nematodes in colder areas. To reduce the adult beetle population in summer, set out Japanese beetle traps at least 200 feet away from your garden in a perimeter around your property. In this way, the flying beetles will find the traps before they find your plants. You can also handpick the adults in the morning while they are sluggish and drop them in a pail of soapy water.
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