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Cosmos Roots - Chocolate
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How to Plant Cosmos Flower Bulbs
Fast Facts
- Planting season
- Spring
- Life cycle
- Annual, Perennial
- Light
- Full Sun
- Planting depth
- Deep Enough to Accommodate Root Length
- Spacing
- 2 feet
- Mature height
- Up to 30 inches
- Hardiness zones
- 7 to 11
- Bloom season
- Summer
Ranges cover every variety in this group. Check the product page for the exact figures.
About Cosmos Flower Bulbs
Cosmos Flower Bulbs grow in full sun positions. Expect up to 30 inches at maturity. Flowering runs summer. The figures below are the ones on the packets in this group; each product page carries the exact numbers for that variety.
When to plant
Plant in spring. Bulbs go in while the soil is still workable, and want to be in the ground long enough to settle before it freezes. Hardy in zones 7 to 11 — your local frost dates decide the exact week.
Where to plant
Choose a site in full sun. Drainage matters more than anything else: bulbs sitting in wet winter soil rot. Allow 2 feet between plants so air can move between them. Plan for up to 30 inches of growth when you place them in a bed or border.
How to plant
Set the bulb deep enough to accommodate root length deep, pointed end up, spaced 2 feet apart. Water gently to settle the soil, then keep the surface evenly moist until seedlings or shoots appear.
How to care
Water at the base of the plant rather than over the leaves. In zones 7 to 11 these come back each year: let the foliage die down naturally after flowering, since that is what feeds next season's growth. Flowers appear summer; cutting or deadheading regularly keeps more coming.
