Plant Profile: Zinnia elegans

Zinnia elegans, commonly referred to as the common zinnia, is a beloved choice among gardeners, boasting a wide array of cultivars. These are the most frequently cultivated zinnias, characterized by their bushy, leafy growth, typically reaching heights of 1 to 3 feet, and occasionally up to 4 feet, supported by upright, hairy, branching stems. The flowers can be semi-double to fully double, resembling dahlias or featuring rolled petals. In cooler summer climates, they bloom continuously from summer through fall, although their flowering may diminish during peak summer heat, especially if they fall victim to fungal diseases. To combat this, it is advisable to select disease-resistant varieties in hot, humid regions. Ensuring good air circulation around the plants can help mitigate the risk of fungal leaf diseases. Z. elegans is particularly vulnerable to issues such as powdery mildew, leaf spots, root rot, and blights. These zinnias thrive in well-drained, humusy soils that remain evenly moist and receive full sunlight. For optimal blooming throughout the season, sow seeds directly in the soil after the last frost, and consider planting at 2-3 week intervals until the end of June.

The Profusion Series, an award-winning hybrid, is a cross between Zinnia angustifolia and Zinnia elegans, showcasing the best traits of both species. This series is noted for its exceptional disease resistance and drought tolerance, thriving in both heat and humidity without the need for deadheading. The plants form dense, compact mounds that can grow up to 18 inches tall and come in a variety of vibrant colors.

There is a growing trend towards creating more compact plant varieties. The peak blooming period for these zinnias typically spans from midsummer to early fall (September), with fungal issues more prevalent in shaded or moist conditions, particularly in southern regions. They exhibit moderate drought tolerance and are rarely affected by deer.