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Butterfly Pea Seeds, Thai Double Sky Blue
(Clitoria ternatea). Butterfly pea is one of our favorite heat-loving flowering vines, and this serene, sky-blue variety will complete your tranquil garden setting. This vigorous climber will produce a wall of powder blue double blooms. This rare shade is eye catching, and it also makes a lovely cup of tea.
- Perennial in zones 10-11 or as annual in cooler climates
- Sprouts in 7–21 days
- Days to maturity: 75–90 days
- Full sun
- Planting depth: 1 inch
- Plant spacing: 6 to 12 inches
- Height at maturity: 3–6 feet (climbing vine)
- Ideal temperature: 70°F to 90°F
- Frost hardy? No
Growing Tips
Thai Double Sky Blue butterfly pea produces stunning double-petaled blooms in a soft sky-blue hue. This vigorous climber thrives in warm, sunny conditions and benefits from trellising or fencing. Well-draining, organically rich soil and regular watering will yield the most prolific flowering. The plant is easy to maintain and adds both beauty and soil-enrichment to gardens.
When to Grow
Start indoors 8-10 weeks before final spring frost or plant Thai Double Sky Blue seeds after the final frost date once soil temperatures consistently stay above 65°F. It’s ideal for late spring and early summer planting in most climates. In frost-free zones, start earlier or grow year-round. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'
How to Sow and Plant
To enhance germination, soak seeds in warm water for 12–24 hours before sowing. Plant them 1 inch deep in moist, well-drained soil in a location receiving at least 6 hours of sunlight. Space plants 6 to 12 inches apart and provide a vertical support structure at planting time to encourage early vining growth.
How to Grow
Maintain even moisture, especially during dry spells, and mulch around plants to retain soil moisture and reduce weed competition. Encourage continuous blooming by regularly harvesting flowers and removing spent blooms. Light pruning can manage growth and shape, especially in small garden spaces. Feed occasionally with compost for additional vigor.
How to Save
- Let pods to fully mature and dry on the vine before harvesting
- Harvest when pods are brown and beginning to crack open
- Remove seeds from pods and discard any that are moldy or damaged
- Let seeds air-dry for a week in a shaded, well-ventilated space
- Store in a labeled paper envelope or glass jar in a cool, dark place
FAQ
What makes Thai Double Sky Blue butterfly pea different from other varieties?
This variety features unique double-layered petals in a soft sky blue tone, giving it a fuller, more ornamental bloom. It’s especially popular for floral arrangements and decorative culinary uses.
Can Thai Double Sky Blue butterfly pea be used for tea or dye like the single blue types?
Yes, although its color is slightly lighter, the petals still contain anthocyanins that create a vibrant blue tea. The blossoms can also be used as natural food coloring or pH-reactive dye.
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