Why herbs bolt suddenly

Bolting is when herbs shoot up a flower stalk and shift from leaves to seeds, often catching growers off guard.

What's happening

The plant redirects energy into flowers and seeds. A central stem elongates, leaves become smaller and bitter, and flower buds appear. Coriander is notorious for bolting within weeks in Indian summers.

Why this happens

Heat is the primary trigger. When daytime temperatures cross 35°C consistently, many herbs read this as a signal to reproduce. Long days and root stress from small pots accelerate it. Once triggered, it's hard to reverse.

What usually helps

Grow bolt-prone herbs in cooler months (October–February). In summer, provide afternoon shade and harvest frequently. Pinch emerging flower buds immediately. Choose slow-bolt desi coriander varieties. Consistent soil moisture also helps, since drought hastens bolting.

What to expect next

Once bolting is advanced, leaf flavour turns bitter. Let the plant set seed, collect them, and start fresh. Successive sowings every 2–3 weeks ensure you always have young, productive plants ready.