How to Make Butterfly Pea Flower Tea (Hot, Iced & Color-Changing)
How to Make Butterfly Pea Flower Tea
The bluest cup in the tea world — and the only one that changes colour in front of you. Here's exactly how to brew butterfly pea flower tea hot and iced, why a squeeze of lime turns it from sapphire to violet to pink, and what else those little blue petals can do.
A climbing vine with an electric-blue flower.
Butterfly pea (Clitoria ternatea) is a fast-growing vine found across South and Southeast Asia — in Sri Lanka it's nil katarolu, a familiar sight scrambling over garden fences. The deep indigo petals are picked and dried whole, and they've been brewed for generations: as nam dok anchan in Thailand, as the blue in Malaysia's nasi kerabu rice, and as a caffeine-free household infusion across the region. Ours are grown in Sri Lanka and dried whole to keep the petals — and their colour — intact.
Butterfly pea is a vine; blue lotus is a water lily — completely different plants that both happen to brew a blue-tinted cup, which keeps the internet confused. If you're comparing blue botanicals, our lotus & water lily comparison guide untangles that side of the family.
The basic blue cup — hot or iced.
Butterfly pea is forgiving: no bitterness to fight, no precise temperatures to hit. The petals give up their colour fast and their flavour is mild, so the brew is really about how deep a blue you want.
Butterfly Pea Flower Tea
1 cup · ~6 minutes · naturally caffeine-free
Ingredients
- 5–8 dried butterfly pea flowers (about 1 teaspoon), or 1 tea sachet
- 1 cup (8 oz) water, just off the boil
- Honey and a wedge of lemon or lime, optional — but the lemon is the magic trick
Method
- Put the flowers in a cup or teapot and pour over the hot water.
- Steep 4–5 minutes, until the water is a deep sapphire blue. Longer deepens the colour; past 10 minutes it picks up a slightly grassy edge.
- Strain. Drink it blue as-is, or sweeten with honey.
- For the show: squeeze in lemon or lime and watch the cup turn violet, then pink, in seconds.
Brew double-strength (10–12 flowers per cup), cool, and pour over ice. Blue ice cubes work too — freeze strong tea in a tray and drop the cubes into lemonade or sparkling water for a slow colour change as they melt.
Why the colour changes — pH, in a glass.
The petals are rich in anthocyanins — natural pigments that read the acidity of whatever they're dissolved in and answer with a different colour. It's the same pigment family that colours blueberries and red cabbage, unusually concentrated in these petals. No dyes, no additives — just chemistry you can drink.
Blue — neutral
Plain water sits near neutral pH, and the tea brews a clean sapphire blue. This is the resting state.
Violet — a little acid
A few drops of citrus nudge the pH down and the pigments shift purple — the in-between shade every video pauses on.
Pink — more acid
A full squeeze of lemon or lime lands the drink in bright violet-pink. More acid, warmer colour.
Serve the blue tea and the lemon separately and let guests do the pour — the change happens in seconds and never stops being satisfying. Milk does something gentler: it turns the tea a soft lavender-grey for blue lattes.
Five ways to use the blue.
Colour-changing lemonade
Layer blue tea over iced lemon water and let the drink shift as it mixes — full recipe below. The summer showpiece.
Blue latte
Strong blue tea + warm frothed milk + honey. The milk softens the blue to lavender — a caffeine-free latte that photographs like a dream.
Blue rice
Steep 10 flowers in the cooking water, remove, then cook the rice in it — the Malaysian nasi kerabu method. Works in any rice cooker.
Colour-shift ice cubes
Freeze double-strength tea into cubes. In lemonade, tonic or sparkling water they melt from blue toward violet as they go.
Mocktails & cocktails
Blue tea is a bartender's favourite base — it changes colour the moment citrus hits the shaker. Syrups made from it do the same.
Natural blue for baking
Steep petals in the liquid of a recipe — milk for pancakes, water for agar jellies — for a plant-based blue with no artificial colouring.
Colour-Changing Butterfly Pea Lemonade
2 glasses · ~15 minutes · the one to make for guests
Ingredients
- 1 tablespoon dried butterfly pea flowers (about 10 flowers)
- 1 cup hot water
- 2 tablespoons honey or sugar, to taste
- ½ cup fresh lemon or lime juice
- 1 cup cold water + plenty of ice
Method
- Steep the flowers in the hot water for 5 minutes until deep blue. Strain, stir in the honey, and let cool.
- Mix the lemon juice with the cold water and divide between two tall glasses full of ice.
- Pour the blue tea slowly over the back of a spoon so it layers on top of the lemon water.
- Serve with a stirrer — as the layers mix, the drink runs blue → violet → pink from top to bottom.
Two forms, two jobs.
Both brew the same blue — the choice is about how you'll use them.
-
1Whole loose flowers — the versatile form.
Best for lemonade, rice, lattes, ice cubes and anything where you control the strength. Shop loose flowers → -
2Tea sachets — the everyday cup.
One sachet, one mug, zero straining. Best for desks, travel and gifting. Shop 30 sachets → -
3Either way, whole petals win.
Intact dried flowers hold their pigment; crushed dust fades faster and brews murky.
What good butterfly pea flowers look like.
The colour tells you almost everything: vivid deep indigo-blue petals mean careful, shade-dried flowers. Pale, brownish or crumbled flowers brew a weak, grey-ish cup.
Whole intact flowers, not fragments · deep indigo colour · clean floral smell · a seller who lab-tests — ours are batch-tested with certificates published. Our full guide to cheap vs premium blue pea flower covers what the price difference actually buys.
Airtight jar, cool and dark — light is the enemy of the pigment. Kept properly, the flowers hold their colour for a year or more.
Butterfly pea tea FAQs
How many flowers do I use per cup?
5–8 dried flowers (about a teaspoon) per cup, or one sachet. Steep 4–5 minutes and strain. More flowers deepen the colour more than the taste — for iced drinks, double it.
Why does the tea change colour?
The petals are rich in anthocyanins — pigments that respond to acidity. Neutral water reads blue; add citrus and the pigments shift violet, then pink. It's pH chemistry made visible, with no dyes involved.
What does it taste like?
Very mild — lightly floral, gently earthy, a bit like a delicate green tea without any bitterness. The colour is the show, which is why it pairs so well with lemon, honey, lemongrass and ginger.
Does it have caffeine?
None — butterfly pea is unrelated to the tea plant, so the infusion is naturally 100% caffeine-free and works at any hour.
Is butterfly pea the same as blue lotus?
No — butterfly pea (Clitoria ternatea) is a climbing vine; blue lotus is a water lily with its own separate tradition. They're often confused because both brew a blue cup. Our lotus comparison guide covers the water-lily side.
Is blue matcha the same thing?
"Blue matcha" is simply powdered butterfly pea flowers — no tea-plant matcha in it at all. It behaves the same in drinks: blue in water, purple-pink with acid.
Can I drink it every day?
It's enjoyed as an everyday caffeine-free infusion across South and Southeast Asia. As with any botanical you plan to use regularly, check with a healthcare professional first if you're pregnant, nursing, on medication, or managing a health condition.
Where can I buy butterfly pea flowers in the USA?
Dried flowers ship easily: our Sri Lankan-grown butterfly pea flowers and 30-sachet tea come lab-tested by batch, with tracked delivery to all US states, typically 8–12 days.
The blue that does the trick.
Whole dried butterfly pea flowers, grown in Sri Lanka, shade-dried to keep their indigo, and lab-tested by batch — as loose flowers for lemonades, lattes and blue rice, or 30 sachets for the everyday cup. Tracked shipping to the USA in 8–12 days.
Keep reading: hibiscus tea, hot & iced · how to use guava leaves · blue lotus vs white lotus vs red water lily.
