Introduction
Cleome, often called spider flower, is a striking annual ornamental plant valued for its tall growth, unusual flower structure, and ability to create dramatic garden displays. It is especially admired for its airy clusters of blooms and long stamens that give the flowers a spider-like appearance. Because of its height and open branching habit, cleome is widely planted in the background of flower beds, mixed borders, and cottage-style gardens.
Native to South America, cleome adapts well to warm climates and grows successfully in many parts of Nepal during spring and summer. Gardeners appreciate cleome because it grows easily from seed, tolerates heat, and produces flowers for a long time once established.
Its combination of height, unique flower form, and pollinator attraction makes cleome one of the most useful annual plants for adding structure and visual interest to ornamental gardens.
Scientific Classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Brassicales
Family: Cleomaceae
Genus: Cleome
Species: Cleome hassleriana
Common name: Spider flower
Native origin: South America
Modern garden varieties include compact forms for smaller gardens and tall varieties for background planting.
Identification of Plant
Cleome is an upright annual herb that develops strong stems and an open branching structure. The leaves are palmately divided into several narrow leaflets, giving the plant a distinctive foliage pattern.
The flowers appear in loose clusters at the top of stems. Each bloom has four petals and long protruding stamens that create the characteristic spider-like shape. Colors include pink, white, lavender, and purple shades.
As the plant grows, it continues producing flower clusters along the stem, resulting in a prolonged blooming display. Because of its tall growth, divided leaves, and unique blooms, cleome is easily recognized in ornamental gardens.
Climate and Soil Requirement
Cleome prefers warm and sunny conditions and grows best in temperatures between 20–32°C. It performs very well in Nepal during spring and summer in sunny open spaces.
Choose a location receiving at least six hours of sunlight daily. Soil should be well drained and moderately fertile. Mixing compost into the soil before planting improves growth and flowering.
Cleome tolerates relatively poor soils but performs best when drainage is good. Excess fertilizer should be avoided, as it may encourage leafy growth instead of flowers.
Propagation and Planting Method
Cleome is commonly grown from seed and can be sown directly into prepared beds or raised in nursery trays.
For direct sowing, place seeds about 1–1.5 cm deep in loose soil and keep the area moist until germination. Seeds usually sprout within 7–12 days in warm conditions.
If seedlings are raised in trays, transplant them when they reach about 10–12 cm height. Maintain spacing of about 35–45 cm between plants because cleome grows tall and needs space for airflow.
Planting is usually done in late winter or early spring so that flowering continues into summer.
Care and Maintenance
Cleome is a relatively low-maintenance plant but benefits from basic care practices.
Water plants moderately, allowing the soil to dry slightly between watering. Once established, cleome tolerates short dry periods but flowers best with consistent moisture.
Applying compost before planting usually provides enough nutrients for the season. Additional fertilizer is rarely required unless soil fertility is extremely poor.
Tall plants may require light support in very windy areas, especially when grown in exposed beds. Removing faded flower clusters can help encourage further blooming and improve plant appearance.
Weeding during early growth stages ensures plants establish properly and receive sufficient nutrients.
Pest and Disease Management
Cleome is generally resistant to pests and diseases, but minor issues may occasionally occur.
Aphids may appear on tender shoots and buds, causing reduced growth. Caterpillars may sometimes chew leaves, though damage is usually limited.
Neem oil spray applied weekly works well as an organic preventive treatment. Removing affected leaves early helps reduce pest spread.
Fungal problems such as leaf spots or stem rot may occur in overcrowded or poorly drained beds. Proper spacing, sunlight, and moderate watering usually prevent such issues.
Healthy plants grown in sunny, airy locations rarely face serious problems.
Flowering and Garden Uses
Cleome usually begins flowering about 70–80 days after planting and continues blooming for several weeks. Because the plant keeps producing new flower clusters along the stem, the display can last for a long period.
In home gardening, cleome is widely used for:
Background planting in flower beds
Mixed seasonal ornamental displays
Cottage-style garden design
Pollinator-friendly planting schemes
Adding height variation in landscapes
Because of its unique flowers and tall structure, cleome is especially effective in creating layered and visually interesting garden compositions.