How to Grow Coriander (Daun Ketumbar) from Seed in Malaysia

Yes, you can grow coriander (daun ketumbar) in Malaysia, and you can start cutting leaves about 4–6 weeks after sowing. The catch is that coriander is a cool-weather herb: in our heat it bolts (runs to flower) quickly, so each sowing gives leaves for only a few weeks. The key tip: crush the seeds lightly before sowing, sow directly in a deep pot in a spot with afternoon shade, and sow a new batch every 2–3 weeks so you always have young plants.

Quick facts

Item	Coriander
Sun	4–5 hours of morning sun; shade in the afternoon
Sowing	Direct sow 0.5–1 cm deep; crush seeds lightly and soak overnight first
Germination	7–14 days, sometimes up to 3 weeks
Spacing	5–10 cm between plants for leaf harvest
Days to harvest	30–45 days for leaves
Container	At least 20 cm deep; coriander has a long taproot

Choosing a spot and container

Coriander wants bright light but not heat. On a condo balcony, morning sun followed by shade from around midday is ideal. On a west-facing balcony, place it behind taller plants, under a shade net, or move the pot into shade every afternoon. A bright corridor that gets a few hours of direct sun also works.

Coriander grows a long taproot and dislikes being moved, so sow it straight into its final container. Choose a pot or polybag at least 20 cm deep. Wider pots let you sow more plants together, which is the best way to get a useful bunch of leaves at one time.

Soil and potting mix

Use a light, free-draining mix with some compost:

• 2 parts potting mix
• 1 part compost
• 1 part burnt rice husk, coarse sand or perlite for drainage

Coriander hates waterlogged roots. In heavy soil it yellows and rots, especially during the rainy season.

How to sow coriander step by step

What we call a coriander "seed" is actually a small round fruit holding two seeds inside. Splitting it helps it sprout faster and more evenly.

1. Crush lightly. Place seeds on a cutting board and press gently with the flat of a jar or rolling pin until most of them split into two halves. Do not grind them to powder.
2. Soak. Soak the split seeds in water for about 12–24 hours. Drain.
3. Prepare the pot. Fill it with moist mix to about 2 cm below the rim.
4. Sow. Scatter the seeds over the surface about 2–3 cm apart, or sow in short rows 10 cm apart.
5. Cover. Cover with 0.5–1 cm of mix and press lightly.
6. Keep moist and shaded. Water gently and keep the pot in shade until seedlings appear. Mist daily if the surface dries. Be patient — coriander is slow, usually 7–14 days.
7. Thin. When seedlings are 5 cm tall, thin to roughly 5–10 cm apart. Use the thinnings as micro-greens.

To work out how much seed to sow for the size of your pot:

CalculatorsSowing Density & Seed CalculatorSowing density calculator: how many plants fit your bed or pot and how many seeds to sow for kangkung, choy sum, lettuce, chili, tomato and more.

Succession sowing: the secret to steady coriander

In the lowlands, even well-grown coriander usually starts to bolt within a few weeks of your first harvest. Instead of fighting this, plan for it: sow a new pot every 2–3 weeks. Two or three pots at different stages give you a continuous supply. Bolting plants are not wasted — let them flower and set seed (see below).

Watering in hot and rainy weather

• Keep the soil evenly moist but never soggy. Dry spells are the main trigger for early bolting.
• Hot weather: water in the morning and check again in the evening. A thin mulch of dry leaves or cocopeat keeps roots cooler.
• Rainy season: move pots under the eaves during long downpours. Waterlogged coriander yellows and collapses quickly. Make sure pots drain and do not stand in saucers of water.

Feeding

Coriander does not need heavy feeding. Mix compost into the potting mix before sowing, and once seedlings have 4–5 leaves, give a diluted liquid fertilizer every 10–14 days at the label rate. Too much fertilizer gives soft, weak growth with less aroma.

Common problems and pests in Malaysia

• Bolting. The plant sends up a tall stem with fine, feathery leaves and white flowers. Heat, drought and age cause it. Harvest regularly, keep soil moist, give afternoon shade and keep sowing new batches.
• Seeds not sprouting. Usually seeds that were not split or soaked, too deep, or allowed to dry out. Coriander also simply takes longer than most crops — wait at least 2 weeks before resowing.
• Damping off and root rot. Seedlings collapsing or older plants wilting with brown roots. Use a free-draining mix, avoid overwatering and keep the pot raised.
• Aphids. Clusters on young shoots and flower stems. Rinse off with water or spray diluted neem oil or a mild soap solution, and wash leaves before eating.
• Caterpillars. Occasional leaf chewing. Hand-pick.
• Yellow lower leaves. Often waterlogging, or old leaves at the end of the plant's life. Check drainage first.

More natural methods:

GuidesOrganic Pest Control for Malaysian Home GardensIdentify aphids, whiteflies, mealybugs, thrips, spider mites, caterpillars, leaf miners, snails and fruit flies, and control them organically and safely.

Harvesting

• Start when plants are 10–15 cm tall, about 30–45 days after sowing.
• Cut the outer stems near the base and leave the central growing point. The plant keeps producing new leaves from the centre, so you can cut several times.
• Never take more than about a third of the plant at once.
• Once it bolts, harvest the remaining broad leaves quickly — the feathery new leaves on the flower stem are edible but less tasty.

Coriander wilts quickly after cutting. Pick just before cooking, or stand the stems in a glass of water in the fridge.

Saving seed

Saving coriander seed is easy and practical, because bolting happens anyway:

1. Let one or two bolted plants flower. Small white flowers also attract helpful insects.
2. Green seeds form, then slowly turn light brown and dry on the plant.
3. When most seeds are brown, cut the stems and hang them upside down in a paper bag in a shaded, airy place for a week or so.
4. Shake or rub the seeds off, and store fully dry seed in an airtight jar.

These dried seeds are the same ketumbar used as a spice, and you can crush and sow them for your next batch.

FAQ

Why does my coriander flower so fast? Heat is the main reason, made worse by dry soil and age. In the lowlands, plan on sowing every 2–3 weeks.

Can I sow ketumbar spice seeds from the kitchen? Sometimes they sprout, but spice seed may be old, treated or not stored for sowing, so germination is unpredictable. Seed packed for sowing is more reliable.

Can I transplant coriander seedlings? It is possible when they are very small, but coriander resents root disturbance and often bolts early after moving. Direct sowing is better.

How many pots do I need? For a household that uses coriander often, two or three pots sown a few weeks apart is a practical start.

Watch it grow