How to Grow Cassia (Sicklepod) from Seed in Malaysia
How to grow cassia seed (sicklepod, Senna obtusifolia) in Malaysia: soaking hard seeds, sowing, pots, care, pests and harvesting dry pods.
- Difficulty
- Easy
- Days to harvest
- 90–120 days
- Updated
- 2026-11-05
Yes — cassia, also called sicklepod (Senna obtusifolia, 草决明), is one of the easiest plants you can raise in lowland Malaysia. It loves heat and strong sun, copes with poor soil, and needs very little fussing. Expect yellow flowers from about 2 months and dry pods ready to pick from about 3–4 months after sowing. The one tip that matters: soak the hard seeds overnight in warm (not boiling) water before sowing, or many will sit in the soil for weeks without sprouting.
The seeds are traditionally roasted and brewed as a tea. This guide is about growing the plant; it is not medical advice.
Quick facts
| Item | Cassia |
|---|---|
| Sun | Full sun, 6 hours or more |
| Sowing depth | 1–2 cm, after soaking overnight |
| Germination | About 4–10 days after soaking |
| Spacing | 30–40 cm between plants |
| Days to harvest | Flowers from about 60 days; dry pods from about 90–120 days |
| Container | At least 30 cm wide and deep per plant; a large polybag or bucket |
| Support | Not usually needed; a stake helps in windy spots |
Choosing a spot and container
Cassia grows into a bushy, upright plant about 60–120 cm tall, so treat it like a small shrub. A sunny fence line, the edge of a terrace-house yard or a roof terrace suits it well. On a balcony, give it a large container in the brightest corner — in shade it stretches and sets few pods.
Use a pot or polybag at least 30 cm wide and deep for one plant. Big pots of wet soil are heavy; check the load before lining up several on a condo balcony:
A nice detail: the leaflets fold together in the evening and open again in the morning. That is normal, not a sign of thirst.
Soil and potting mix
Cassia is not fussy. Ordinary garden soil works, as long as water drains away after rain. For pots, mix:
- 2 parts garden soil or potting mix
- 1 part compost
- 1 part burnt rice husk (sekam bakar) or coarse sand for drainage
Avoid heavily fertilized soil: too much nitrogen gives leafy plants with fewer pods.
How to sow cassia step by step
- Soak the seeds. Pour warm water (never boiling) over the seeds in a cup and leave overnight. Swollen seeds are ready; any that stay hard can soak another night.
- Prepare the spot. Fill your pot or loosen the bed, mix in a little compost and water it well.
- Sow. Push two seeds into each spot, 1–2 cm deep. Sow directly where the plant will grow; cassia grows a taproot and is happiest left undisturbed.
- Cover and firm. Cover with soil and press lightly.
- Keep moist, not soggy. Water gently so the surface stays damp. Seedlings usually appear in 4–10 days.
- Thin. When seedlings are about 10 cm tall, keep the strongest one in each spot. Snip the other at soil level rather than pulling it, so you do not disturb the roots. Final spacing is 30–40 cm.
If you start them in trays, use deep cells and transplant at 3–4 true leaves, keeping the root ball intact.
Cassia Seeds
Easy, heat-loving annual with yellow flowers and long pods; the seeds are traditionally roasted for tea.
Watering in hot and rainy weather
- Seedling stage: keep the soil evenly damp for the first 3–4 weeks.
- Once established: cassia copes with dry spells far better than most vegetables. In the ground, water only in long dry weeks. In pots, water when the top 2–3 cm of soil feels dry — on a hot balcony that may be every day.
- Rainy season: the main risk is waterlogging. Make sure pots drain freely, raise them off wet ground, and do not let soaked seeds sit in puddles, or they rot before they sprout.
Feeding
Mix a handful of compost into the soil at sowing. After that, cassia needs little. If plants look pale after 6–8 weeks, give one light feed of compost or a half-strength balanced fertilizer.
Pruning and keeping it tidy
Cassia needs no pruning. If a plant grows too tall, pinch the top once at about 40 cm to make it branch lower.
Be aware that cassia can become weedy: pods that split on the plant scatter seeds that sprout readily, and it is a common weed in farming areas. Pick pods before they open and pull up stray seedlings.
Common pests and problems in Malaysia
- Caterpillars. Green caterpillars of the sulphur butterflies (the yellow and lime butterflies you see around gardens) love Senna leaves and can strip a young plant. Check the leaves every few days and pick them off by hand. Older plants usually outgrow the damage.
- Aphids and mealybugs. Clusters on new shoots and flower stems. Hose them off, or spray with diluted neem oil or a mild soap solution in the evening.
- Leaf spots in wet weather. Remove spotted leaves, give plants space, and water at the base in the morning.
- Few flowers. Usually too much shade or too much fertilizer.
Harvesting and drying the seeds
Pods are long, slender and curved like a sickle, which gives the plant its English name. Leave them on the plant until they turn brown and dry, then:
- Pick the dry pods on a sunny morning, before they split.
- Spread them on a tray in a dry, airy place for a few more days.
- Split the pods and shake out the shiny, angular seeds.
- Dry the seeds fully — they should rattle and feel hard — then store them in an airtight jar in a cool, dark place.
One plant keeps producing pods for several weeks, then slows down; sow a fresh batch every few months. Store seeds and pods away from young children and pets.
FAQ
My seeds did not sprout after two weeks. Why? Most likely they were not soaked long enough, or the water was too cool. Dig one up: if it is still small and hard, soak the rest again overnight before sowing.
Is this the same as the big cassia trees in parks? No. Several plants share the cassia name, including large flowering trees. This is a short-lived, shrubby plant grown from seed each season.
Can I grow it in a small pot? It will survive, but stays small and gives few pods. A 30 cm pot per plant is the practical minimum.