Thai Blue Butterfly Pea is a stunning vining edible flower native to Southeast Asia, prized for its enormous indigo blooms that serve double duty as both a natural food dye and a calming herbal tea. This heirloom variety, discovered in Thailand, produces single and double blue flowers that literally smother the vines in dazzling color. Hardy in zones 10-11, it reaches harvest in 75-100 days and grows vigorously on trellises or supports, rewarding gardeners with weeks of gorgeous blooms and culinary possibilities.
6
Full Sun
Moderate
10-11
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High
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The flowers are genuinely spectacular: deep indigo petals so vibrant they've been used for centuries to dye everything from rice to desserts and silk in Thailand. When you brew the fresh blooms into tea and add a drop of lemon, the color shifts dramatically from blue to pink, creating a visual magic that delights both kids and adults. Beyond the show, these vines produce abundant flowers on a vigorous growing frame, making them both a stunning ornamental edible and a functional kitchen garden staple.
The flowers are the main harvest: brew them fresh or dried into a calming herbal tea, use them as a natural food dye for rice, desserts, and other dishes, or float them fresh in beverages and on plates for striking visual impact. The color-shifting property when citrus is added makes the tea a beloved kid-friendly drink and a conversation starter at any table. In traditional Southeast Asian cooking, the flowers tint everything from sticky rice to cocktails with their deep blue hue.
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Direct sow seeds into warm soil after all frost danger has passed. This tropical plant germinates reliably in warm conditions and grows quickly once established, so starting seeds directly where they will grow is often the simplest approach for gardeners in warm zones.
Pick flowers when they are fully open and the indigo color is at its deepest and most vibrant, typically in the morning after dew has dried. Fresh flowers are ready to use immediately for tea or culinary applications, or they can be dried by laying them flat in a shaded, well-ventilated space for 1-2 weeks and stored for later use. Harvest flowers regularly throughout the 75-100 day growing window to encourage continued blooming.
Pinch back growing tips early in the season to encourage branching and fuller vine coverage on your trellis. Deadheading spent flowers will keep blooms coming all season, though leaving some flowers to mature allows the plant to set seed for future harvests. Remove any dead or damaged vines as they appear to keep the plant vigorous and attractive.
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“This variety hails directly from Thailand, where the flowers have been woven into local food culture for generations. The single and double flowered types that Baker Creek sources were specifically found in Thai gardens and markets, where they remain a traditional ingredient in culinary applications and natural dyeing practices. By bringing this variety to Western gardeners, the catalog preserves a centuries-old tradition and makes accessible a plant that Thai cooks and dyers have relied upon long before it appeared in English-language seed catalogs.”