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You can plant coriander indoors pretty much any time of year, and it’s easier than most people think.
All you need is a sunny windowsill, a decent-sized pot, and a little patience.
Coriander (also called cilantro) grows fast indoors, but it does have a few quirks you’ll want to know about before you start.
If you’ve been wondering how to plant coriander indoors without it bolting or turning bitter, this guide will walk you through every step.
In this post, we’ll cover how to plant coriander indoors from seed, the best soil and light conditions, and how to keep your plants producing fresh leaves for weeks.
Let’s dig in.
How to Plant Coriander Indoors: Step by Step
Learning how to plant coriander indoors starts with choosing the right setup.
Coriander has a long taproot, so it hates being transplanted.
That means you should plant coriander indoors directly into its final pot rather than starting it in tiny seed trays.
Here’s how to do it properly.
1. Pick the Right Pot and Soil
Choose a pot that’s at least 10 to 12 inches deep and wide.
Coriander roots need room to stretch down, and shallow pots cause stressed, spindly plants.
Fill your pot with a loose, well-draining potting mix.
You can mix in some perlite or coarse sand to improve drainage.
Good drainage matters because coriander hates soggy roots.
2. Sow the Seeds Directly
When you plant coriander indoors, press the seeds about a quarter-inch deep into the soil.
Space them roughly two inches apart so the seedlings have breathing room.
Here’s a trick most beginners miss: coriander seeds are actually two seeds fused together.
Gently crush them with the back of a spoon before planting to boost your germination rate.
Water lightly after sowing and keep the soil consistently moist, not soaked.
3. Give It Plenty of Light
Coriander needs at least six hours of direct sunlight daily.
A south-facing windowsill is ideal for how to plant coriander indoors successfully.
If your window doesn’t get enough natural light, use a grow light for 10 to 12 hours a day.
Without enough light, your coriander will grow leggy and weak.
4. Keep the Temperature Mild
Coriander prefers temperatures between 60 and 70°F.
Hot, stuffy rooms make coriander bolt, which means it shoots up a flower stalk and stops producing leaves.
So keep your pot away from radiators and heating vents.
Caring for Coriander Indoors
Once your seeds sprout, usually within 7 to 10 days, the real work begins.
If you want to know how to plant coriander indoors and actually keep it alive, these care tips matter.
1. Water Consistently
Coriander likes evenly moist soil.
Check the top inch of soil with your finger before watering.
If it feels dry, give it a drink.
If it’s still damp, wait another day.
Overwatering is the fastest way to kill indoor coriander.
2. Fertilize Lightly
Feed your coriander with a diluted liquid fertilizer every two to three weeks.
Don’t overdo it.
Too much nitrogen produces lots of leaves but weak flavor.
3. Harvest Often
Harvesting is part of how to plant coriander indoors successfully.
Snip the outer leaves first, starting when the plant is about six inches tall.
Never cut more than a third of the plant at once.
Frequent harvesting encourages bushier growth and delays bolting.
4. Watch for Bolting
If your coriander starts growing tall and flowering, it’s bolting.
This happens when the plant gets too hot or too stressed.
Once coriander bolts, the leaves turn bitter and the plant stops producing.
The fix?
Start new seeds every few weeks so you always have a fresh supply.
Common Mistakes When You Plant Coriander Indoors
Even seasoned gardeners mess up how to plant coriander indoors.
Here are the mistakes to avoid.
1. Using Small Pots
Coriander’s taproot needs depth.
Small pots stunt growth and cause early bolting.
2. Planting Too Densely
Crowded coriander competes for light and nutrients.
Thin your seedlings so they stand about four inches apart once they’re a few inches tall.
3. Skipping Drainage Holes
No drainage means root rot.
Always use a pot with holes at the bottom.
4. Ignoring Pests
Aphids and whiteflies love indoor coriander.
Check the undersides of leaves weekly and rinse pests off with a gentle spray of water.
So, How to Plant Coriander Indoors?
You plant coriander indoors by sowing seeds directly into a deep pot with well-draining soil and giving it six hours of sunlight daily.
Keep the soil moist, the temperature mild, and harvest often to delay bolting.
Start new seeds every few weeks for a steady supply of fresh leaves.
With these tips, you now know exactly how to plant coriander indoors and keep it thriving all year long.
Happy growing.