Cleome, commonly known as spider flower, is a stunning addition to any garden. Its unique flowers and tall, airy structure create a striking visual appeal. This resilient plant thrives in various conditions, making it an excellent choice for gardeners in Colorado. In this article, we will explore the ins and outs of growing cleome in this region, from selecting the right variety to planting, caring for, and maintaining your cleome throughout the growing season.
Before diving into the specifics of cultivation, it’s essential to familiarize yourself with the characteristics of cleome. Native to South America and Africa, this annual flowering plant belongs to the Capparaceae family. Cleome typically grows between 3 to 5 feet tall and boasts large clusters of flowers that bloom in shades of pink, white, and lavender.
The plant has a unique fragrance that attracts pollinators like bees and butterflies, making it an excellent choice for flourishing gardens. Additionally, cleome is drought-resistant once established, which is particularly advantageous for Colorado’s often arid climate.
When growing cleome in Colorado, selecting the right variety is crucial. There are several species available; however, the most popular are:
Cleome hassleriana: This is the most common species found in gardens. It features large clusters of pink or white flowers and blooms from late spring until frost.
Cleome lutea: Known for its yellow blooms, this variety is less common but can add diversity to your garden.
Cleome ‘Queen’ series: This cultivar has been bred for compactness and improved flower color. Varieties like ‘Queen Pink’ or ‘Queen White’ are excellent choices for smaller spaces.
Consider your garden’s requirements and select a variety that aligns with your aesthetic preferences and space availability.
Cleome thrives in full sun; therefore, choose a location that receives at least six hours of direct sunlight daily. In Colorado, the intense sun can sometimes be overwhelming, so consider partial shade during the hottest parts of summer if you live in a higher altitude area.
Cleome prefers well-draining soil with good fertility. Conduct a soil test to determine pH levels; cleome thrives best in slightly acidic to neutral soil (pH 6.0 to 7.0). If necessary, amend the soil with organic material such as compost or well-rotted manure to improve drainage and nutrient content.
Due to their tall stature, cleomes require ample spacing between plants to ensure air circulation and proper growth. Space them approximately 12-18 inches apart to prevent overcrowding.
In Colorado, it’s best to plant cleome after the last frost date in your area—typically around mid-May in most regions. Starting seeds indoors six to eight weeks before the last frost can give your plants a head start if you’re eager for early blooms.
You can either direct seed cleome into your garden or transplant seedlings started indoors:
Direct Seeding: If you choose this method, prepare the soil by loosening it and removing any weeds. Sow seeds about 1/4 inch deep and water gently.
Transplanting: If starting indoors, transplant seedlings outdoors when they are about 4-6 inches tall and have developed several true leaves.
Regardless of your method, ensure that seedlings or seeds are placed at the correct depth for optimal growth.
Once planted, cleomes need consistent watering until they establish a robust root system. During their initial growth phase, water them regularly—about once a week—depending on rainfall and temperature conditions.
Once established (usually within 3-4 weeks), cleomes become drought-tolerant. However, during exceptionally dry spells or extreme heat waves typical of Colorado summers, consider supplemental watering every two weeks.
While cleomes are mildly tolerant of poor soils due to their drought-resistant nature, they benefit from occasional fertilization throughout the growing season:
Initial Application: When planting, mix balanced slow-release fertilizer into the soil according to package instructions.
Mid-season Boost: Apply a diluted liquid fertilizer every four weeks during peak growth (late June through July) to promote vibrant blooms and healthy foliage.
However, avoid over-fertilizing as excessive nutrients can lead to lush foliage at the expense of flowers.
To encourage continuous blooming throughout the summer months, practice deadheading by removing spent flowers regularly. This practice not only keeps your plant looking tidy but also redirects energy towards new growth rather than seed production.
If your plants become leggy or unkempt later in the season, prune back some stems by one-third after blooming peaks around mid-July. This rejuvenation can lead to bushier growth and additional flowering.
Cleomes are generally pest-resistant; however, watch out for common pests such as aphids or spider mites. If infestations occur:
Maintaining healthy plants through good cultural practices will also help minimize pest problems.
Being an annual plant in cooler climates like Colorado’s mountainous regions means that cleomes will not survive frost. However, you can collect seeds from mature flowers at season’s end for next year’s planting:
While you don’t need specialized winter care for cleomes themselves due to their annual nature, preparing for next year’s planting cycle by ensuring you have enough seeds will pay off!
Growing cleome in Colorado can be a rewarding experience whether you’re an experienced gardener or just starting out. With their unique beauty and resilience against tough environmental conditions, cleomes create stunning displays throughout summer months while requiring minimal maintenance once established.
By selecting suitable varieties, preparing adequate planting sites with proper watering and fertilizing schedules—alongside pest management techniques—you’ll reap bountiful rewards when it comes time for those gorgeous blooms! Happy gardening!