When Should I Start Zinnia Seeds Indoors?

Start zinnia seeds indoors about 4-6 weeks before your last expected frost date. This gives seedlings enough time to grow strong before transplanting them into the garden once warm weather arrives.

How Long Do Zinnia Seeds Take to Germinate?

Zinnia seeds usually germinate in 5-7 days when the soil temperature stays between 70-80°F and the soil is kept evenly moist.

Do Zinnia Seeds Need Light to Germinate?

No. Zinnia seeds germinate best when they are lightly covered with soil, about 1/4-1/2 inch deep. Once seedlings emerge, they will need plenty of bright light to grow strong stems.

How Many Zinnia Seeds Should I Plant Per Cell?

Plant one or two seeds per cell container. If both seeds sprout, you can thin out the weaker seedling once the plants begin growing.

When Can Zinnia Seedlings Be Planted Outdoors?

Zinnias should be planted outdoors after the last frost, once the soil has warmed and nighttime temperatures consistently stay above 50°F.

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