Flowers

How to Plant, Grow, and Care for Cleome Flowers

Despite its glamorous and fantastical flowers, this plant is exceptionally easy to grow! Gardening expert Lindsay Miller explains how to grow and care for this beautiful flower in your garden.

I grew cleome from seed in my cutting garden last year....

for the first time and was delighted with, well, so many parts of this plant! First, it’s height: it grew at warp speed and was easily 5 feet tall by the latter half of the summer. Farmer florists and cut flower growers can rejoice at this plant’s long, strong, straight stems.

Secondly, those flowers. Covered in whiskery white, pink, magenta, and purple flowers, it’s no wonder that cleome is also commonly called “spider flower”. The flowers were like little jewels on the end of a magic wand, and they looked airy and delicate next to my chunky (yet very beloved) sunflowers and marigolds.

Lastly, its hardiness. My gardens experienced both flooding, as well as periods of drought last year which definitely wreaked havoc on some members of my garden. Not cleome! It flowered steadily from summer through fall’s first hard frost with little assistance from me.

I can’t tell if its look is elegant, or more otherworldly and weird – either way, this low-maintenance plant is worth trying. Read on and learn more about growing cleome in the garden.
What Is It?
Cleome is an herbaceous flowering plant that is most commonly grown as an annual, although it may be hardy year-round in our absolute warmest growing zones. It is known for its one-of-a-kind, spider-like flowers, which attract hummingbirds, butterflies, bees, and moths. This species is thought to be mostly pollinated by bats in its native tropical habitat.

Characteristics
This plant features tall, stalk-like stems that are slightly hairy in texture. These glandular hairs can be sticky and may give off a musky, not totally unpleasant scent. Stems branch out to palmate leaves composed of 5-7 leaflets that are slightly fuzzy in texture. Small spines protrude from the base of each leaf petiole. Although the fragrance and leaf shape of this plant strongly resembles that of Cannabis sativa, cleome is not at all related.

Cleome is a long-flowering annual, and the blooms persist from early summer to the first hard frost. The flowers are really the stars of this plant! An unbranched 6-8 inch wide cluster of flowers (called a raceme) forms at the very top of the stem. Each individual flower features white, pink, or rosy purple petals that eventually open to show 3-inch long, thread-like stamen.

Elongated seed pods that resemble miniature green beans emerge from each individual flower. Gardeners interested in seed saving can collect and dry the pods, which open quite easily. Or, seed pods can be left on the plant, adding to its otherworldly vibe. Cleome self-seeds readily, although the plants aren’t overly aggressive or considered invasive. Some sterile hybrid cultivars may not produce seeds at all.

This genus grows rapidly and some varieties can easily reach 6 feet tall. Several newer cultivars have been bred to be more manageable for the home gardener and stand a compact 2-3 feet tall, with spineless, easy to handle stems and minimal fragrance.

Native Area
There are over 100 species of the genus Cleome spread throughout South America, Africa, and areas of Asia. There is even one native to North America: C. serrulata, also called the Rocky Mountain bee plant.

Cleome houtteana, which is the spider flower most widely grown by gardeners as an ornamental plant, is native to Paraguay, Uruguay, Argentina, and parts of Brazil. Most types of cleome are found in disturbed areas including roadsides, gravelly ditches, thickets, and meadow edges.

Planting
This is a versatile flower that works beautifully in beds, borders, mass meadowscapes, and containers. The lower stems of some cleome cultivars tend to be bare of leaves, so consider positioning them behind a mounded and floriferous perennial, such as coreopsis or hardy geranium.

Pair them with other sun-loving, fuss-free annuals like zinnias, cosmos, and sunflowers for a colorful cutting garden. Create a charming purple and pink cottage border by interplanting cleome among lavender and roses.

In containers, this plant shines as a “thriller plant” with its tall, upright stems that rarely need staking. Try them in the back of a pot filled with yellow gem marigolds and creeping jenny for heat-tolerant, pink and gold patio display. Shorter cultivars like ‘Linde Armstrong’ stand just 12-18 inches tall, perfect for containers.