Jun 11, 2026 / By Anas Heaba / in Growing Guides
Roselle, known in Egypt as karkade, is one of the country's most beloved crops. Its deep crimson calyces are dried to brew the famous tart, ruby-red tea served hot in winter and ice-cold in summer. Roselle is a heat-loving plant that thrives in Egypt's long, hot summers, which makes it a natural fit for gardens here, especially in Upper Egypt where most of the national crop is grown. The plant is generous: a single mature bush is large and bushy, and once the calyces start forming you can keep harvesting for weeks.
Roselle is a short-day, frost-sensitive crop that needs a long, warm season of roughly six months and only begins flowering as autumn days shorten. So timing in Egypt centres on a spring sowing and an autumn-winter harvest. In Upper Egypt (Aswan, Qena, Fayoum), sow once the cold ends, from about late March through May or June, giving the plants the full summer heat for strong leafy growth; the calyces then form and ripen from October to December. In the Delta, sow in April or May, and the milder winter lets the harvest stretch into late autumn or early winter. Avoid sowing from November to February: winters are too cool for germination and there is too little summer heat left ahead for a full crop.
Sow seeds about 1.3 cm deep into moist, well-drained soil; a shallower placement of around 0.5 cm also works. Soaking the seed in water for about 24 hours first, or lightly scarifying it then soaking in hot (not boiling) water, speeds and improves germination. At an optimal soil temperature of about 24-29 C, seeds sprout in roughly 5-10 days. In cooler conditions you can start seeds in flats and transplant to the field after 4-6 weeks, but only once all danger of frost has passed. Space plants about 45 cm apart, in rows about 90 cm apart, because mature plants grow large and need room. If you direct-seed, sow a few seeds per spot and thin to the strongest seedling once the plants reach about 5-8 cm tall.
Roselle responds well to a fertile start. Mix compost into the soil at planting, and then apply fertilizer about 2-4 weeks after planting, ideally guided by a soil test. Be careful with nitrogen: too much nitrogen pushes the plant into leafy growth at the expense of flowering, which means fewer calyces to harvest. A phosphorus source, on the other hand, supports good calyx development, so lean toward balanced feeding rather than heavy nitrogen.
Give roselle full sun. Strong vegetative growth and a heavy set of calyces depend on plenty of light; in shade the plants grow weak and bloom poorly. The soil should be well-drained but kept consistently and generously moist, especially during dry stretches. Roselle tolerates heat well but should not be left to dry out while it is actively growing. Watch for problems: the most serious is root-knot nematode, which galls the roots and can sharply cut yield, so rotate planting sites each season and mulch to suppress it. In wet soils, fungal foot, stem and root rots can appear, and in hot, dry spells spider mites may show up on the leaves.
Flowering is triggered by the shortening days of autumn, roughly late September into October. The pale, creamy blooms open and drop, and the fleshy red calyces swell behind them. Harvest the calyces while they are well-formed, plump, tender and a rich crimson, but before they begin to dry out on the plant, which is about 8-10 days after each calyx forms. Pick regularly to keep the plant producing, then dry the calyces for tea.
Start with quality seed for a reliable crop. At tna W rna you can order Roselle (Hibiscus sabdariffa) seeds for your spring sowing, with a larger karkade seed option if you are planting a bigger patch. If you'd like to compare varieties, you can also browse hibiscus (zahret al-khatmeya) seeds. Soak your seeds, sow them in warm spring soil, and look forward to a crimson autumn harvest.
Jun 11, 2026 by Anas Heaba
Jun 11, 2026 by Anas Heaba
