HerbsButterfly Pea
Clitoria ternatea
Butterfly pea is a fast-growing vine with sky-blue flowers that you can start from seed in full sun. Its flowers are used as a natural food coloring.
How to grow butterfly pea
Side by side
Pick two or three seeds to see how they grow, side by side: sprouting, spacing, sun, water, frost and pet safety in one table.

Comparing Butterfly Pea vs. Cumin
The comparison
| Fact | ![]() | ![]() |
|---|---|---|
| Difficulty | Easy | Moderate |
| Life cycle | Not yet verified | Annual |
| Germination time | 14–21 days | 7–14 days |
| Sowing depth | Not yet verified | 6 mm–1.5 cm¼–½ in |
| Spacing between plants | Not yet verified | 10–20 cm4–8 in |
| Sun | Full sun | Full sun |
| Frost tolerance | Not yet verified | Tender (no frost) |
| Links |
Up close
What each one is, in a few lines, with the full growing guide one click away.
HerbsClitoria ternatea
Butterfly pea is a fast-growing vine with sky-blue flowers that you can start from seed in full sun. Its flowers are used as a natural food coloring.
How to grow butterfly pea
HerbsCuminum cyminum
Cumin is a warm-season annual herb grown from seed for its aromatic spice seeds. It needs full sun and about 120 frost-free days from planting to harvest.
How to grow cuminKeep comparing
Add a third seed, or swap one for a close relative from the same category.


Butterfly Pea vs. Cumin vs. BasilAdd basil as a third

Butterfly Pea vs. Cumin vs. Bee BalmAdd bee balm as a third

Butterfly Pea vs. Cumin vs. BorageAdd borage as a third
Butterfly Pea vs. BasilButterfly Pea against another herb
Cumin vs. BasilCumin against another herb
Butterfly Pea vs. Bee BalmButterfly Pea against another herbThe table, row by row
Every row is a fact from each seed's own profile, lined up so the differences stand out.
Germination time and temperature
How many days the seeds take to sprout, and the temperature range they sprout in.
Sowing depth and spacing
How deep to sow each seed and how far apart the plants should grow. “On the surface” means the seed isn't covered.
Days to maturity and life cycle
How long until the plant is ready, counted from sowing or from transplanting (each value says which). Annuals live one year, biennials two, perennials longer.
Sun and water
Full sun means 6 or more hours of direct sun a day, partial shade a few hours. Water needs are rated low, moderate or high.
Containers, frost tolerance and soil pH
Whether it grows in a pot, with the smallest pot when it's known. Frost tolerance runs from tender (no frost) to hardy. Soil pH 7 is neutral.
Toxicity to cats and dogs
Whether the plant is toxic to cats and dogs.
Quick wins
Days from sowing until the first shoots appear, in good conditions.
Pet friendly
Listed as non-toxic to both cats and dogs. Each seed's page has the details.
Not safe for pets: borage, buckwheat, caraway, carnation and 14 more.
Comparing
Each seed's page explains how to grow it from seed, with facts researched and reviewed by our editors.