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Powdery mildew can be a common problem3 – don’t wet the foliage when watering, or water early in the morning to allow the leaves time to dry off before nightfall.
When zinnia seedlings reach about 4 inches/10 cm tall (indoors or outdoors), give plants a quarter strength application of a 5-10-5 liquid fertilizer1.
Zinnias like to be well watered especially when young; but do not like waterlogged soil. As a rule of thumb, plants like about 1 inch of water per week1
To have bushier-shaped zinnia plants, pinch off an inch or so from the tips of the main stems while plants are still young1. Regularly deadhead or remove old flowers to keep plants attractive and encourage more blooms1.
If taller zinnia varieties begin to flop, stake with y-shaped branches or metal hoop staking around the plants1.
A second application of a 5-10-5 fertilizer in mid season will help to keep zinnia plants growing strongly1.
Sow in succession for a longer flowering display. Only cover lightly (about 1/4 inch of soil) since Zinnias need light to germinate1. Keep moist until established.
Aim to sow 0.25 inches (0.64 cm) deep and try to ensure a gap of at least 11.7 inches (30.0 cm).By our calculations*, you should look at sowing Common zinnia about 21 days before your last frost date .
Zinnias do not like to be transplanted. Either sow directly in place, or sow in degradable pots that can be transplanted whole without disturbing the roots. Thin out once seedlings have reached 1 inch/2.5 cm in height if starting indoors, or 2-3 inches/5-7 cm if starting outdoors1. When thinning, gently pluck up seedlings or cut them off with a scissors at soil level so the remaining seedlings’ tender root systems aren’t disturbed1.
Common zinnia is tender, so ensure you wait until all danger of frost has passed in your area before considering planting outside.Cut flowers, or allow them to dry on the plant. When the flower head is completely dry, pull the petals off. The base of each petal has a seed.
Seed viability is ten years.
These estimates for how long Common zinnia takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Average 6 days | Min 2 days | Max 18 days (267)
Average 32 days | Min 22 days | Max 69 days (7)
Average 56 days | Min 39 days | Max 126 days (7)
Our when to plant Common zinnia estimates are relative to your last frost date.
The botanical epithet is from the Latin elegans meaning “elegant”. The genus Zinnia is named after Johann Gottfried Zinn (1727-1759), a German professor of botany who grew the plant after it was “discovered” in the New World and brought back to Europe1. Zinnias are native to Mexico, Central America, and the southwestern United States1.
elegant zinnia, youth-and-old-age, Zinnia
Zinnia violacea
Misspellings: Zinna, Zinna elegans