Zinnia Flower Germination. For sooner blooms start seeds indoors 4 to 6 weeks before your last frost date. When planting in spring keep the soil slightly moist until germination which takes 7-10 days.
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Space the seeds 1 to 2 inches apart and cover with 12 inch of soil. The seeds are small and arrow-shaped. If starting indoors plant.
Jun 29 2020 It takes air and soil of more than 70 F to germinate well so wait until spring is firmly in place before planting zinnia seeds.
Depending on the variety grown they can range in height from 12 inches up to 48 inches tall and can be spaced anywhere between 8 to 24 inches apart. When the soil reaches a minimum temperature of 60F zinnias can be planted outdoors. Although there are. Zinnias are known to germinate within roughly 7 to 10 days after sowing.
