The listing, 20 Orange Cosmos Seeds has ended.
Water the orange cosmos sparingly; it is drought tolerate and doesn't like muddy soil. During long periods of dry weather or when the plant begins to show signs of wilting, water generously to saturate the entire root
Avoid fertilizer, as cosmos thrive in poor, infertile soil. Rich soil and excessive fertilization often results in lush, green foliage but very few flowers. Eventually, fertilized plants become long and leggy.
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Stake tall varieties to keep them upright during wind and rain. Drive a bamboo or wooden stake into the ground 3 to 4 inches from the plant and secure the plant to the stake with soft string or garden twine. Stake plants while they are small, as attempting to stake larger plants may damage the roots.
Check the plants at least once every week to remove cosmos flowers as soon as they fade, preventing the plants from setting seed prematurely, decreasing blooming. Alternatively, wait until most of the plants develop seed pods in place of blooms, then cut the plants back to a height of about 12 to 18 inches; trimming revitalizes a tired-looking plant and the cosmos blooms again in about a month.
If you want a head start, you can plant cosmos indoors 4 to 6 weeks before the last spring frost in trays or pots with a good seed-starting mixture. Seedlings grow fast, so move them into 5-inch pots as soon as they're 3 or 4 inches tall.
Plant seeds in moist, well-drained soil about 1/4-inch deep and 12–18 inches apart after the danger of frost has passed. You can also plant transplants instead of seeds. They also like soil that is not too rich.
They can tolerate warm, dry weather.
Depending on the type of flower, cosmos can grow anywhere between 18–60 inches tall.
If you are growing cosmos from seeds, be mindful that it takes about 7 weeks to first bloom. After that, though, your flowers should continue to bloom until the next frost.