How to Grow Cilantro Indoors (Coriander) Without It Bolting in a Week

Last updated: 26.06.2026.

Cilantro is the herb that breaks people’s confidence. You grow it, it looks great for two weeks, then it shoots up a tall flower stalk, the leaves turn wispy and bitter, and it is basically over. This is called bolting, and it is the single reason most people give up on growing cilantro indoors. Known as coriander to UK and many European readers, it has a reputation for being temperamental.

Here is the reframe that fixes everything: cilantro is not a plant you keep alive for months like basil or mint. It is a fast, short-lived herb you grow in quick succession. Once you stop fighting its nature and work with it, fresh cilantro indoors becomes easy and reliable. Here is how.

Why cilantro bolts (and why that changes your whole approach)

Cilantro is genetically programmed to grow fast, flower, and set seed (those seeds are the spice coriander). Heat and stress speed this up dramatically. In a warm indoor room, or when the roots get disturbed or dry out, the plant panics and rushes to flower, which is bolting. Once it bolts, leaf production stops and the flavor turns soapy and bitter.

You cannot really stop a cilantro plant from eventually bolting. So the winning strategy is not “keep one plant going forever,” it is succession sowing: start a new small pot every 2 to 3 weeks so you always have young, leafy plants coming on while older ones fade. This one mental shift is the difference between cilantro success and frustration.

Starting cilantro the right way

A key detail: cilantro hates being transplanted. It has a taproot that resents disturbance, and moving a seedling often triggers bolting. So unlike most herbs, do not start it in a tray and move it. Sow the seeds directly in the pot you will grow it in.

1. Use a pot at least 8 inches (20 cm) deep with a drainage hole, to give the taproot room. Deeper is better for cilantro than for most herbs.
2. Fill with organic potting mix.
3. Scatter cilantro/coriander seeds over the surface, cover lightly with about a quarter-inch (half cm) of soil, and water gently.
4. Tip: lightly crushing the round seeds before sowing can speed and improve germination, since each “seed” is actually two.

Seeds germinate in 7 to 14 days. Sow fairly densely and do not thin too aggressively, since cilantro is happy growing in a clump and you will harvest it fairly young anyway.

Light and temperature: keep it cool

Here is where cilantro differs from sun-baking herbs like basil. Cilantro likes bright light but prefers cooler temperatures, around 50 to 75°F (10 to 24°C). Heat is what pushes it to bolt, so a blazing hot south-facing sill in summer is actually counterproductive.

Aim for 4 to 6 hours of light a day in a bright but not scorching spot. An east-facing window, or a west window that is not too hot, works well. A cooler room is better than a warm one. In winter, or in a dim north-facing London flat or shaded Berlin Altbau, a grow light keeps it from getting leggy, and the do you need a grow light guide helps you decide. Keeping it cool is genuinely the main trick to slowing the bolt.

Watering

Cilantro likes consistent moisture but not sogginess. Let the top half-inch (1 cm) of soil dry, then water well, and never let the pot sit in water (the usual overwatering caution). Do not let it fully dry out either, since drought stress is another bolting trigger. Steady, even moisture keeps it calm and leafy.

Harvesting to slow the bolt

Harvest cilantro often and from the outer leaves, snipping the older outer stems at the base and leaving the young central growth to keep producing. Regular harvesting actually helps delay bolting, because you keep removing mature growth and encouraging fresh leaves.

When you do see a central flower stalk starting to shoot up, you can pinch it out to buy a little more leaf time, but once a plant is determined to bolt, it will. That is your signal to lean on the next pot you started. And do not feel bad about a bolted plant, since you can let it flower and set seed to harvest your own coriander spice, or just compost it and move to the next sowing.

The honest expectation

Set your expectations correctly and cilantro is easy. One sowing gives you a few weeks of good leaf harvest, not months. With a fresh pot started every couple of weeks, you will have a continuous supply of fresh cilantro year-round, which is far more than the sad supermarket bunch that rots in the fridge in days.

Cilantro rewards the grower who works with its fast, fleeting nature instead of against it. Sow direct, keep it cool, harvest often, and always have the next pot coming. Do that and the herb with the worst reputation becomes one of the most reliable things on your windowsill. For the broader approach to a whole herb windowsill, see how to grow herbs indoors without sunlight.