Southwest cosmos grows 2-3 feet tall and is branched several times in the upper half, with a single flower head, about 1 1/4 inches across, at the end of each slender, bare stem. It has 8 pale-orchid ray flowers, with a yellow center.
When the first inch (2.5 cm) of soil feels dry to the touch, your thirsty plants will appreciate a touch of water. Once established, Cosmos sulphureus flowers may not require water at all. In case of a prolonged drought, you can provide your plants with a nice soaking once every week.
Cosmos sulphureus plants are usually pretty independent and do not require frequent fertilizing. In fact, too much fertilizer can actually have a negative impact, especially on potted plants. But if your flowers seem to be struggling overall, feed them with an all-purpose liquid fertilizer once a year in spring.
A soil temperature of 65° degrees or higher is ideal. Gently rake the seeds into the loose soil, being careful not to plant too deep.
Of the 20 species of annual and perennial cosmos flowers, cultivars of C. sulphureus and C. bipinnatus are best suited to containers.
Cosmos is a lovely non-toxic flower which is recommended for children's Cosmos parviflorus attains a height of up to 100 cm (40 inches). Leaves are deeply divided into narrow linear segments. Ray florets red, pink or white, the colors sometimes mixed in the same population. Achenes are barbed, causing them to lodge in fur or clothing.
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