- Sow seeds lightly—about ¼-inch deep and 12–18 inches apart after the danger of frost has passed.
- Cosmos don’t need any special soil preparation.
- When growing Cosmos from seeds, it takes about 7 weeks to first bloom. After that, though, your flowers should continue to bloom until the next frost.
- You can plant Cosmos indoors 4 to 6 weeks before the last spring frost in trays or pots with a good seed-starting mixture.
- Keep the soil moist (not wet) at 68° F
- NOTE: Chocolate Cosmos germination can be a little slow and irregular, so be patient.
- Then, move them into 5-inch pots as soon as they’re 3 or 4 inches tall.
- To prolong further flowering, you should deadhead the plants (remove the dead/faded flowers). This speeds up flower development and aids branching.
- Water regularly, but make sure you don’t over-water the plants. Over-watering and over-fertilization can lead to plants with fewer flowers.
- Cosmos can tolerate dry soil, even in a hot, arid areas.
- They prefer to be grown in well-draining soil in full sun.
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