Cleomes aren't the most popular annuals sold at nurseries, and it might be because they look rather weedy as young seedlings. Cleomes usually do not start blooming until they are well established in the garden. Though they can be planted in early spring, many gardeners opt for a late fall seed sowing directly in garden soil. Common Name Cleomes, spider flower, Rocky Mountain bee plant, stinking clover Botanical Name Cleome Family Cleomaceae Plant Type Annual Mature Size 1.5 to 5 feet tall and 1 to 2 feet wide Sun Exposure Full sun, part sun Soil Type Average, well-drained Soil pH Acidic to neutral Bloom Time Summer