Members of the Cleome plant genus are half hardy annual and perennials. Plants can reach from 90 cm to 1.2 m (1 to 4 feet) in height.
Some Common names for members of this genus include Spider Flower and African Cabbage. They bloom from summer to late in the autumn. When in bloom, they carry pink, white, or purple spiky flower heads.
The Cleome genus is also referred to as being the Spider Flower Genus. It includes about 170 species. These largely consist of Perennial plants, though there are also quite a few shrubs and annuals in the genus.
As it is a native to the subtropical regions of the world, it is also often grown as an annual by gardeners who live in more temperate regions.
It is a very interesting genus of plants scientifically, as it seems to be an evolutionary step between the C3 and C4 photosynthesis classes.
It is speculated that three members of the Cleome genus (C. gynandra; C. oxalidea; and C. angustifolia ) were able to acquire the ability of C4 (NAD-malic enzyme) photosynthesis independently.
Cleome lutea by Matt Lavin.
Cleome hassleriana (Spider Flower Cleome) are grown for their attractive leaves (palmate). They also carry attractive racemes of four-petalled pink flowers.
The species Cleome gynandra (Shona cabbage, Wild Spinach) is native to Africa, and is often grown as a green vegetable.
Both the leaves and shoots have culinary uses in Africa. Where they are usually boiled and used in stews, while in Thailand they are fermented into a pickle.
It is also thought that Cleome gynandra may have some medicinal use, as its leaves are a strong antioxidant, which is though to play a role in the support of inflammation.
Cleome hassleriana syn. Cleome houtteana syn. Tarenaya hassleriana
Cleome hassleriana (Spider Flower / Spider Plant / Pink Queen), photograph by Carl Lewis; CC.
Cleome spinosa (Spiny Spiderflower), photograph by 阿橋 HQ; CC.
Cleome serrulata (Rocky Mountain Beeplant / Stinking-clover / Beeweed / Skunk Weed), photograph by Matt Lavin; CC.
Cleome gynandra (Shona Cabbage / Cat's Whiskers / Spiderwisp), picture by Forest and Kim Starr; CC.
Cleome seeds grown outdoors should be sown on the surface in a partially shaded or sunny area of the garden.
They can grow in most soils. Ideally the soil should have a pH of 6 to 7.
When planning on growing spider flower seedlings indoors first, then the process should be started about one and a half months before you plan to put them out.
Germination takes about two weeks. Seeds should be imbibed by placing the seeds (within soil) in a black bag, then placing in the fridge for two weeks.
Seeds should then be sown out at a temperature of 21 to 24 Centigrade (70 to 75°F).
Seedlings of Cleome should be planted out with a spacing of about 50 to 60 cm (20 to 24 inches) following the last frost of spring.
Plants of the Cleome genus are easy to look after. They should be fertilized and watered whilst growing.
Remove seed pods before they have chance to shatter.
I hope that you enjoyed this guide on how to grow Cleome plants. You may also enjoy the following Gardener's HQ deer resistant plant growing guides: How to grow Ginkgo biloba, Iris plant, Hibiscus plant, and Puschkinia plants.