Cleome is a group of annual and perennial flowering shrubs. Cleome hasslerana, or spider flower, the most commonly-grown garden species, grows to 48 inches in height and blooms in summer and fall with rose or white flowers. Because they are tall, gardeners generally plant them in the back of the garden to provide a colorful backdrop to other ornamentals. Sow the cleome seeds directly into a sunny to partially shady area of the garden two to three weeks prior to the last frost.
Prepare the planting bed by removing any weeds, rocks and other debris. Use the gardening fork to dig into the soil to a depth of 6 inches, turning and crushing it.
Add a 3-inch layer of compost to the bed and mix it to a depth of 6 inches. Rake the area until it is smooth and level.
Scatter the cleome seeds on the surface of the soil and cover them with 1/4 inch of sand.
Water the area with a fine mist or a soaker hose to avoid washing away the seed. The soil should be moist, not soggy. Keep the soil moist until the seeds germinate, which should occur within 10 days of planting.