To grow spider flowers (cleome) from seed, it is best to start in early spring when the weather is warm. Begin by sowing the seeds in a warm, well-lit spot under cover. This could be in a greenhouse, on a windowsill, or in a heated propagator. It is important to provide the seeds with the right conditions to germinate successfully.
When sowing the seeds, make sure to space them out evenly in the containers or trays. This will give each seedling enough room to grow without competing for space. Gently press the seeds into the soil, but avoid burying them too deep as they need light to germinate.
After sowing, keep the soil consistently moist but not waterlogged. Check the moisture levels regularly and water as needed, especially during dry spells. It is important to keep the soil evenly moist to promote healthy seedling growth.
As the seedlings emerge, they will need plenty of light to grow strong and healthy. If growing indoors, ensure they receive adequate sunlight or use artificial grow lights to supplement the light. If the seedlings are not getting enough light, they may become leggy and weak.
Once the seedlings have grown a few sets of true leaves, they can be transplanted into individual pots or a larger container. This will give them more space to grow and develop before they are ready to be planted outdoors.
Before planting the spider flowers outside, it is crucial to harden them off. This involves gradually acclimating the seedlings to outdoor conditions. Start by placing them in a sheltered spot outdoors for a few hours each day, gradually increasing the time over the course of a week or two. This will help the seedlings adjust to the fluctuating temperatures, wind, and direct sunlight.
When all risk of frost has passed, and the seedlings have been hardened off, they can be planted in their final position in the garden. Choose a sunny spot with well-draining soil. Spider flowers can tolerate some shade, but they will produce more flowers in full sun.
Prepare the planting area by loosening the soil and removing any weeds or debris. Dig a hole slightly larger than the root ball of the seedling and gently place it in, making sure the top of the root ball is level with the soil surface. Backfill the hole and firm the soil gently around the seedling.
Water the newly planted seedlings thoroughly to settle the soil and ensure good root-to-soil contact. After planting, continue to water regularly, especially during dry spells. Spider flowers prefer evenly moist soil but avoid overwatering to prevent root rot.
To encourage abundant flowering, it is beneficial to feed the plants. Use a balanced fertilizer or organic compost and follow the instructions on the package for application rates. Apply the fertilizer around the base of the plants, being careful not to let it touch the foliage.
As spider flowers grow taller, they may need staking to protect against wind damage. Use bamboo stakes or other supports to keep the plants upright. Tie the stems to the stakes using soft plant ties or twine, leaving enough room for growth.
Throughout the growing season, remove any dead or faded flowers to encourage continuous blooming. Spider flowers are known for their long-lasting blooms, and regular deadheading will prolong their flowering period.
Growing spider flowers from seed requires sowing in warmth, providing ample light, and keeping the soil consistently moist. Hardening off the seedlings before planting outside is essential, as is choosing a sunny location with well-draining soil. Regular watering, feeding, and staking may be necessary to ensure healthy growth and abundant flowering. By following these steps, you can enjoy the beauty of spider flowers in your garden.
