Good air circulation also can help keep zinnia plants disease-free. Zinnias roots do not like to sit in damp soil and excess moisture improves their chances of getting powdery mildew. While zinnias aren’t particularly picky about their soil, they do prefer it to be fertile, humus-rich, well-drained and with a pH of 5.5 to 7.5. I’ve had a problem with growing the taller varieties of zinnias. In late fall, once all of your perennials have started to turn brown and die back, it’s time to prune some and leave some to cut back in spring. Choose from pastel hues and brighter, vibrant colors. When choosing zinnias for your summer garden, take height into account. Feed again in mid-summer to keep the plants healthy and blooming. Allow the zinnias to dry out and complete their life cycle. Zinnias thrive in hot weather and germinate easily from seed. © Copyright 2020 Hearst Communications, Inc. Zinnia marylandica, Zinnia hybrida, and Zinnia elegans. Nasturtium Pansy. The reseeding is true but true for a different area of the country. As soon as their flowers open, they often become top-heavy and flop over. This is when you want to deadhead or pinch off the flower as it … Trying to harvest a flower too early will result in immature seeds that won't germinate. The decision is up to you. Some cultivars, such as those in the 'Thumbelina' series, are usually less than 6 inches tall. As annuals, they go from seed to flower quickly, which helps keep weeds at bay. Moreover, they perform well in full sun, says the Missouri Botanical Garden. Zinnias are popular, easy to grow annuals that brighten any summer garden. These may produce new, "volunteer" seedlings the following spring. Zinnias help lure predator bugs into a fall garden where they eat destructive pests. Zinnias have a remarkable tolerance to diseases, rarely succumbing to powdery mildew and leaf spot, and they’re highly attractive to bees and butterflies. Zinnias need full sun and well-drained soil. Allow the zinnia flower heads to dry completely on the plant. To encourage the production of new flowers throughout the duration of the growing season, Michigan State University Extension encourages gardeners to remove dead zinnia flower heads, a process known as deadheading. Amendments & Fertilizer: Add compost to the area where zinnias will be planted to enrich the soil. Repeat as needed. Sprinkle them in full sun and you’ll have seedlings in days! This helps spur production of new flower buds on the remaining stems and also helps keep the plant looking tidy. Fall Zinnias. Producing colorful flowers that bloom throughout summer and early fall, zinnias thrive in full sun and are a low-maintenance but colorful addition to planting beds across the U.S. Start zinnias indoors from seeds four to six weeks before your last frost date, or direct-sow zinnia seeds in the garden after the danger of frost is gone. Annual Flowers. What Is the Length of Time From Planting to Full Flowers for Zinnias? Zinnias prefer full sun and well-drained soil. You can practice what is called succession planting where every two weeks seeds are planted ensuring you’ll have a show of zinnias throughout the summer and into early fall. Planting: Zinnia is extremely easy to start from seed. Deadheading zinnias is key if you want a bunch of brilliantly colored blooms. Caring for your mature fall zinnias is easy. Mildew is best prevented by choosing mildew-resistant varieties, spacing plants properly, and watering plants with a soaker hose or drip irrigation that helps keep foliage dry. As an added bonus, zinnias, especially the hot pink and red varieties, are known for attracting birds and butterflies. Zinnias in the 'Magellan' series often are around 14 inches tall, while those in the 'Zahara' series (Zinnia marylandica) grow between 8 and 12 inches tall. Chicago Botanical Garden: Zinnias: The Hardest-Working Flower in the Summer Garden, Missouri State University Extension: Growing Zinnias in Your Flower Garden, Missouri Botanical Garden: Zinnia elegans. Because zinnias are annuals, they don't survive winter, but leaving a few spent flowers on the plant allows seeds to mature that can drop to the ground. Keep the soil moderately moist and lightly fertilize for maximum growth and blooms. Steps. Use clean, sharp garden shears to trim back large stems. How to Deadhead a Zinnia. Each flower will be dark brown and dry to the touch when it is ready to harvest. The first step is … The Profusion and Zahara series of zinnia produce disease resistant mounds of color that last until frost when planted in late summer. By creating an account you agree to the Hunker, Missouri Botanical Gardens: Zinnia (Group), Renee's Garden: Bold and Beautiful Zinnias. Fertilizing zinnias helps keep new flowers blooming throughout the growing season. Sprinkling a well-balanced fertilizer once in a while will suffice. It's important to give plants enough space to grow without crowding, so thin seedlings to allow about 6 to 12 inches depending on height. 1 Once the zinnia flowers are dry, cut or pull them off the plant. This is a rather simple process that most gardeners can do without a problem. They can be planted in the spring throughout Florida and also in the fall in South Florida. If that sounds like too much of a chore, however, the Chicago Botanical Garden suggests choosing zinnias in the 'Zahara' series, which include Coral Rose and Double Zahara Fire. Hunker may earn compensation through affiliate links in this story. Zinnias fare well in dry conditions and can survive droughts. ... Violas Johnny Jump Up’s are a beautiful delicate flower that does well in fall through spring. Dose of a well-balanced fertilizer once in a while will suffice and of! 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