How to Grow Kalmegh (Andrographis) From Seed in the Monsoon
Kalmegh earned the name “king of bitters” honestly: one leaf on the tongue and you will never mistake it again. For anyone wondering how to grow kalmegh plant at home, it is a one season annual: sow the tiny seed in May or June, transplant or thin in the monsoon, and cut the whole plant when it starts flowering in autumn. Then save seed, because next year starts from scratch.
Kalmegh quick facts
- Plant: Andrographis paniculata, an upright annual herb 30 to 90 cm tall
- Sow: May to June in the plains (nursery tray), transplant in July
- Pot: 8 to 10 inches wide and deep (5 to 8 litres) per 2 to 3 plants
- Mix: 2 parts soil, 1 part compost, 1 part sand
- Sun: full sun to light shade; tolerates partial shade under trees
- Harvest: at flowering, roughly 90 to 120 days after sowing
- Taste test: intensely bitter leaves, with no smell to speak of
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How to identify kalmegh
- Stem: square in cross section (roll it between your fingers), dark green, branching at the top.
- Leaves: simple, lance shaped, smooth, 3 to 7 cm long, in opposite pairs.
- Flowers: tiny, two lipped, white with purple or rose spots on the lower lip, on long thin branching stalks.
- Pods: slim, flattened capsules that split and throw tiny brown seeds.
- Taste: extremely bitter, the surest check.
Lookalikes
Dried kalmegh in markets gets mixed with chirayta (Swertia), another bitter herb. Swertia has round, smooth stems and small greenish yellow, four or five petalled flowers, not two lipped ones. In the garden, small leaved Justicia or Ruellia seedlings can look similar until they flower; the square stem plus spotted white lips confirms kalmegh.
When to sow, by zone
| Zone | Sow | Note |
|---|---|---|
| Karachi, coastal | April to July | Easy; may last into winter |
| Multan, Sukkur, Bahawalpur | Late May to June, in shade | Seedlings need 50% shade until the monsoon |
| Lahore, Faisalabad, Delhi | May to June | Transplant with the first monsoon rain |
| Islamabad, Peshawar | June | Harvest before November cold |
| Hills | Skip | Season too short and cool |
Growing kalmegh from seed
The seed has a hard coat and often germinates slowly and unevenly. A short soak helps.
- Soak seed in lukewarm water for 12 to 24 hours.
- Mix it with fine sand and sprinkle over a tray of moist, fine mix; cover with a thin dusting of soil.
- Keep the tray in light shade and damp, misting rather than pouring.
- Expect seedlings in one to three weeks; some come up late, so don’t tip the tray early.
- Transplant seedlings with four to six leaves, 30 cm apart in beds, or two to three to a 10 inch pot.
Our herb propagation guide covers cuttings for similar soft herbs; with kalmegh, 10 cm tip cuttings can root in monsoon humidity, but seed is the usual route.
Sow twice, a fortnight apart
Because kalmegh germinates unevenly, sow half your seed in late May and half in mid June. Whichever batch meets the monsoon at the right size will carry the season, and you won’t lose a year to one failed tray.
Care through the season
- Water: keep seedlings evenly moist; established plants need water when the top 3 cm is dry. Drain pots well in the rains.
- Feeding: mix compost into the soil at transplanting and side dress once a month. The potting mix guide has the base blend.
- Pinching: nip the growing tip at about 20 cm to get a bushier plant with more leaves.
- Weeds: keep the first six weeks weed free; young kalmegh is slow.
Pests and problems
| Sign | Cause | Response |
|---|---|---|
| Seedlings collapse at soil level | Damping off in wet, crowded trays | Sow thinner, water less, more air |
| Yellow lower leaves in rain | Waterlogging | Improve drainage |
| Chewed leaves | Caterpillars, grasshoppers | Hand pick; neem spray |
| Wilting with root rot | Heavy clay | Add sand next time |
Most pests avoid it thanks to that bitterness.
When to harvest kalmegh
Cut the whole plant just above the soil when it begins flowering, usually September to October in the plains. Leave a few plants standing until pods brown, for seed. Dry the cut plants in shade, in a thin layer with good air, until stems snap. Store in a closed jar in the dark; discard anything damp or musty.
Kalmegh is used in Ayurvedic and folk tradition for fevers, and comes with real side effects. All of that, including who should avoid it, lives in our kalmegh cautions post.
Saving seed for next year
- Leave two or three of the strongest plants uncut after the main harvest.
- Watch the slim pods: when the first ones turn brown, they are close to splitting.
- Tie a paper bag over the flowering tops, or cut the stems and lay them on newspaper indoors.
- Once the pods have burst, sieve out the tiny seeds, dry them in shade for a week, and store them in a labelled glass jar.
Home saved seed keeps reasonably for a year in a cool, dry cupboard. Older seed sprouts more slowly, so sow it more thickly.
Kalmegh is not for pregnant or breastfeeding women, young children, or anyone on blood pressure, blood thinning, diabetes or immune suppressing medicines without a doctor’s advice. Allergic reactions, including rashes and, rarely, serious reactions, have been reported. A fever lasting more than three days, a fever in a baby, yellow eyes or dark urine needs a doctor, not a garden herb. Keep pets from chewing the plants.
Grow it or skip it?
Grow it if you want to know and recognise a classic herb, or keep reliable, correctly identified stock. It is undemanding in the monsoon. Skip it if you hoped for a culinary herb: it is far too bitter to cook with. Find kinder herbs in Kitchen Garden.
Kalmegh growing questions
When should kalmegh be sown?
May to June in a seed tray in the plains, transplanted with the first monsoon rain. Karachi can sow from April.
Why are my kalmegh seeds not germinating?
The hard seed coat slows them. Soak for 12 to 24 hours, sow shallow in warm soil, and wait up to three weeks.
Is kalmegh an annual or perennial?
An annual in most of Pakistan and North India; it flowers, seeds and dies within a season.
Can kalmegh grow in a pot?
Yes. A 10 inch pot holds two or three plants with a sandy, compost rich mix.
How do I identify kalmegh plant?
Look for a square stem, smooth lance shaped paired leaves, tiny white flowers spotted purple, and an extreme bitter taste.
Kalmegh ka paudha kaise lagaye?
Soak seed overnight, sow shallow in a tray in May or June, and transplant the seedlings 30 cm apart once they have a few leaves.
Can kalmegh be grown from cuttings?
Soft tip cuttings can root in monsoon humidity, but seed is more reliable for an annual.
Does kalmegh need full sun?
It grows in full sun or partial shade. In Multan heat, light shade keeps young plants going.