Where to Buy Culinary Butterfly Pea Flowers for Thai Cooking

You can buy culinary butterfly pea flowers at Thai and Southeast Asian grocery stores (fresh or frozen), online specialty tea and spice retailers (dried, food-grade), and some farmers markets or nurseries if you want to grow your own. Look for vibrant blue petals labeled “butterfly pea flower,” “blue pea flower,” “dok anchan,” or “Clitoria ternatea”—and ensure the package says food-grade or culinary use, not just for planting.

Why Butterfly Pea Flowers Matter in Thai Food

Butterfly pea flower (Clitoria ternatea) is a striking indigo blossom used in Thai cooking mainly for its natural blue color, not its flavor. The petals have almost no taste—just a faint earthy, green-tea-like note—but when steeped in hot water they release a brilliant cobalt blue. Add a squeeze of lime or lemon and the liquid shifts to violet or magenta. This color-changing trick is used in drinks like nam dok anchan (butterfly pea tea) and in desserts like sticky rice or panna cotta. The flower is also pressed into rice to make blue rice, a beautiful base for savory dishes.

Where to Buy Butterfly Pea Flowers

Thai and Southeast Asian Grocery Stores

If you live near a Thai, Vietnamese, or general Asian supermarket, check the produce section for fresh butterfly pea flowers—sometimes sold in small clamshell packs—or the freezer aisle for frozen whole flowers. Dried flowers are usually in the tea aisle, next to jasmine, pandan, or chrysanthemum teas, or in the spice section. Packages may be labeled in Thai script: อัญชัน (anchan). Fresh flowers should look deep blue-purple, not wilted or brown. Frozen flowers keep their color well; just thaw and use as you would fresh. Dried flowers should be whole, not crumbled to dust, and deeply colored.

Online Retailers for Dried Butterfly Pea Flowers

For most home cooks, dried butterfly pea flowers are the easiest to find online. Look for sellers that specialize in Thai ingredients, culinary herbs, or tea. Search for “dried butterfly pea flowers food grade” on general marketplaces, but read descriptions carefully: avoid flowers sold for cosmetic or crafting use unless they are explicitly labeled food-grade. Reputable spice companies and tea shops often carry them in 1-ounce to 1-pound bags. Expect to pay more for organic or hand-picked flowers. Check reviews for color intensity—the best dried flowers brew a deep blue tea within minutes.

Farmers Markets and Local Growers

In warm climates, butterfly pea grows easily as a vine. Some farmers markets sell fresh cut flowers or small potted plants. If you find a plant, you can harvest your own blossoms all summer. The flowers are edible straight from the vine, but only if grown without pesticides. Fresh flowers can be used immediately or dried on a screen in a dark, dry place for a few days, then stored in an airtight jar.

How to Choose Good Butterfly Pea Flowers

Whether fresh or dried, quality matters because the color payoff depends on pigment concentration. Look for:

• Color: Deep blue or indigo petals, not pale lavender or brownish. Brown spots mean age or moisture damage.
• Intact petals: For dried, whole flowers are better than broken fragments; they store longer and release color more evenly.
• Packaging: For dried, a sealed, opaque bag or jar protects from light and humidity. If buying in bulk, the container should smell faintly grassy, not musty.
• Labeling: “Food grade,” “culinary,” or “edible flowers” are good signs. Avoid anything marked “for external use only” or “dye flowers.”

Using Butterfly Pea Flowers in the Kitchen

The basic method is simple: steep the flowers in hot water to make a blue tea, then use that tea as a coloring liquid for rice, noodles, cocktails, or desserts. Here’s a quick guide:

Making Butterfly Pea Tea (Blue Tea)

1. Rinse a small handful of fresh butterfly pea flowers (about 10-15) or 1 tablespoon of dried butterfly pea flowers.
2. Place in a heatproof cup or teapot. Pour 1 cup (240 ml) of just-boiled water over the flowers.
3. Steep for 5 minutes; the water will turn vivid blue. Strain out the flowers.
4. Sweeten with honey or sugar if desired. Serve hot, or chill for iced tea.
5. To see the color change, add a few drops of fresh lime juice and watch the blue turn purple-pink.

This blue tea has almost no flavor, so it’s often mixed with lemongrass, pandan, or honey. For a stronger color, use more flowers or steep longer (up to 15 minutes).

Making Blue Rice

1. Prepare the blue tea as above, using 1/2 cup (120 ml) water and 2 tablespoons dried flowers for intense color.
2. Use the strained blue liquid as part of the water called for when cooking jasmine rice. For example, if your rice needs 2 cups water, use 1/2 cup blue tea + 1 1/2 cups plain water.
3. Cook rice normally. The grains will turn a soft periwinkle blue.
4. Serve with Thai dishes like massaman curry or pad prik king. The color fades slightly with heat but still looks striking.

Coloring Sticky Rice for Desserts

In Thai desserts like khao niew dok anchan (butterfly pea sticky rice), the blue tea is used to soak or steam glutinous rice. To make blue sticky rice: soak 1 cup glutinous rice in 1 cup blue tea (made strong with 3 tablespoons dried flowers) for at least 4 hours or overnight. Then steam the rice (with the blue water discarded) for 20-25 minutes. The result is a beautiful indigo-tinted rice often served with sweetened coconut milk and mango.

Substitutes for Butterfly Pea Flowers

If you can’t find butterfly pea flowers, there is no perfect substitute for the natural blue color—blue is rare in food. The closest option is blue spirulina powder (a blue-green algae), which gives a similar azure hue but has a slight seaweed taste and does not change color with acid. For purple color shifts, you can use purple sweet potato powder or red cabbage juice, but both add flavor and turn blue only when alkaline (e.g., with a pinch of baking soda). These alternatives work in some recipes but lack the same visual magic and neutral taste.

Storing Butterfly Pea Flowers

Keep dried butterfly pea flowers in an airtight container away from light and heat; they’ll stay vibrant for up to a year. Fresh butterfly pea flowers should be used within a day or two, or frozen in a single layer on a tray, then transferred to a zip-top bag. Frozen flowers can go directly into hot water for tea.

With a little hunting at a Thai grocery or online, you’ll be ready to turn your kitchen into a color-changing laboratory—one blue flower at a time.