How to Germinate Zinnias Indoors

Zinnias belong to Asteraceae, the sunflower family, which is evidenced in the appearance of their cheery flowers and their love for hot, sunny conditions. Species such as Zinnia elegans are widely cultivated in gardens and numerous cultivars have been developed, including some with showy, double-petaled flowers and unusual color variations such as chartreuse. All species of zinnias grow reliably from seeds, but it is best to germinate the seeds indoors approximately four to six weeks before the final frost in spring to allow the plants to establish a root system before being planted.

Potting soil
3-inch peat pots
1-inch-deep nursery tray
Propagation mat
Spray bottle

Instructions

- 1
  Pack sterile potting soil into 3-inch peat pots. Leave 1/8 inch of space between the soil surface and the edge of the peat pot.
- 2
  Place the peat pots on a 1-inch-deep nursery tray to make them easier to handle. Leave approximately 2 inches of space between each peat pot to increase air circulation.
- 3
  Sow two zinnia seeds in each peat pot. Bury the seeds under a 1/4-inch-thick layer of soil. Firm the soil lightly over the seeds.
- 4
  Spritz the soil in each peat pot six or seven times with a spray bottle to moisten it at a 1.5- to 2-inch-depth. Maintain moderate moisture at that level during germination.
- 5
  Place the nursery tray holding the peat pots onto a propagation mat. Adjust the temperature to 70 to 75 degrees F. Maintain that temperature 24 hours a day during germination.
- 6
  Watch for sprouting in five to seven days. Thin the zinnia seedlings once they grow to 1 inch in height and possess two permanent leaves. Remove the less vigorous of the two zinnia seedlings.
- 7
  Plant the zinnia seedlings in a permanent pot or bed in three weeks, or as soon as daytime temperatures reach 70 F.

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