Thumbelina Zinnia Seeds

Sow Zinnia Thumbelina seeds directly into garden soil after the last frost, once the soil temperature settles at 65°F or warmer. Plant each seed about 1/4 inch deep, 6-8 inches apart. Germination takes 5 to 7 days in warm soil. Zinnias resent root disturbance, we don’t recommend starting it indoors. Sow Thumbelina Zinnia seeds every 2 weeks through July to extend the flowering window until frost.

Thumbelina Zinnias need at least 6 hours of direct light to bloom heavily. They can grow in basically every soil, but give them well-drained, moderately fertile ground and you will see denser blooms. Water at the base of the plant once or twice a week and keep the foliage dry, to avoid powdery mildew. Don’t water too much, because Zinnia Thumbelina flowers are drought-tolerant and survive heat waves without complaints. 

Deadhead spent flowers regularly to extend the flowering window longer. Feed once a month with a balanced fertilizer or compost tea, especially in containers, because potting mix runs out of nutrients within 4 to 6 weeks. Watch the lower leaves for powdery mildew by late August, and thin out crowded plants to improve airflow. For cut flowers, harvest early in the morning when the blooms are fully open and put them straight into water, where they hold 5-7 days in a vase.