Space between 15 - 30cm apart (depending on the variety) and rows 30 - 45cm apart.Zinnias are heat lovers, so plant in full sun with good air circulation, this will prevent them from getting powdery mildew.This will encourage stronger, taller stems and more flowers! Pinching out means taking the top 10cm off your seedling. Pinch out your zinnia seedlings when the are 30cm tall (3 true sets of leaves).Start by letting them spend 1 hour a day, working up to 5 hours over a week. After six weeks of growth, the seedlings are ready to begin to venture into the outside world.If the seedling undergoes a stressful events may cause double-flowering varieties to produce single blooms for a period following stress. If you live in a cooler climate, you will need to start them off in a greenhouse environment. Raising the seedlings in single celled trays at around 21-29 degrees (a heat mat may help maintain an accurate temp) may help prevent the roots becoming root bound, reducing transplant shock when transferring the seedlings into the garden. Zinnias don't like being transplanted, so if you live in a warmer climate sow Zinnia seeds direct where they will grow, germination should occur in 3-7 days when the soil temp is around 21-29 degrees.Zinnias are frost sensitive, so wait until the last frost has passed to plant. Gardeners across the world have fallen in love with the beautiful cut and come again flower Zinnia and the good news is they are very easy to grow from seed!
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