Jun 11, 2026 / By Anas Heaba / in Growing Guides
Blue Tea, also known as Butterfly Pea (Clitoria ternatea), is a fast-growing climbing vine prized for its striking pea-like flowers, which open up to about 5 cm across in vivid blue (sometimes white) with a yellow centre. Those petals are what give the famous colour-changing blue tea its hue. The vine is a warm-loving legume that thrives in heat, which makes it a natural fit for Egypt's long, hot summers. It climbs vigorously, reaching up to around 4.5 m, so it doubles as a quick ornamental screen on a fence or trellis. Because it is a nitrogen-fixing legume, it even improves the soil it grows in.
Butterfly Pea is frost-sensitive and warm-loving. It grows best at roughly 18-28 C and is checked or killed by frost, so sow it only after winter's cold has passed. In the Nile Delta and Lower Egypt, where the odd near-frost night occurs from December to February, sow from mid-March to May once nights are reliably warm and the soil is above about 16-18 C. In warmer Upper Egypt (Aswan, Toshka) you can start earlier, from about March to April. A field trial in Toshka found mid-spring sowing best, with a mid-May sowing giving the highest forage yield. Avoid sowing into cold soil below about 15 C, as germination stalls and seedlings suffer from the chill.
The seeds have a hard coat, so a little preparation pays off. Gently scarify each seed with a knife or sandpaper, then soak it in warm water for 12-24 hours before sowing to speed and improve germination. Sow seeds about 2.5 cm deep, spacing them roughly 7.5 cm apart, in full sun (6 or more hours of direct sun daily). Soil temperature should be around 18-27 C. Seeds germinate in about 10-21 days. Once seedlings are up, thin them to about 15-30 cm apart. You can also start seeds indoors 6-8 weeks before the last frost and transplant out once frost danger has passed. The vine tolerates a wide range of soils, from loam to clay to sand, and pH from about 5.5 to 8.9, but it needs good drainage, so loosen heavy ground and add organic matter. Set up a trellis, fence or other support early for the climbing stems.
As a nitrogen-fixing legume, Butterfly Pea makes its own nitrogen through root-nodule bacteria, so it needs little to no nitrogen fertilizer. On Egypt's sandy or desert soils that may lack the right bacteria, inoculating the seed with a broad-spectrum cowpea-group rhizobium strain helps the plant establish. A Toshka field trial showed phosphorus, not nitrogen, is the key fertilizer response in low-fertility desert soils, so a modest dose of phosphorus supports growth and yield where the soil is poor.
Butterfly Pea prefers consistent moisture and well-drained soil. Water moderately once it is established. The plant is notably drought tolerant and can endure a long dry season, but it performs best with steady watering. Avoid waterlogging and overwatering, which cause root rot. Train the climbing stems onto their support as they grow. Watch for whiteflies and spider mites, and stay alert for anthracnose and bacterial soft rot, both of which are less likely on a healthy, well-drained, well-spaced plant.
Butterfly Pea blooms in spring, summer and autumn, and flowering begins within a few months of a warm-season sowing. Forage data show the plant covers the ground 30-40 days after sowing, so growth is quick once it gets going. Pick the open blue flowers in the cooler morning hours, when they are freshly unfurled and at their most colourful. Harvest regularly to encourage more blooms through Egypt's long warm season. Outside frost-free pockets, treat the plant as a warm-season annual, as frost will end its season.
To get the rich blue flowers right, start with quality seed. At tna W rna you can choose fast-growing climbing blue tea seeds for the classic blue blooms described above, or pick up the ready harvested organic blue tea if you want to brew it straight away. If you would also like to grow the white-flowered relative, try the Thai white tea seeds. All grow the same easy, climbing way described in this guide.
Jun 11, 2026 by Anas Heaba
Jun 11, 2026 by Anas Heaba
