When should I plant lemongrass outdoors in Canada?

Move it outdoors (still in its container) after your last frost date once nights are reliably warm — lemongrass is tropical and stalls badly in any cool weather, similar to basil but even more heat-demanding. Bring it back indoors well before your first fall frost date, since even a light frost will damage or kill the foliage.

Should I grow lemongrass from seed, or start with a stalk?

Starting from a fresh stalk (often a grocery-store lemongrass stalk with the base intact, rooted in water) is faster and more reliable than seed, which can be slow and inconsistent to germinate. Either way, plan for a full season of growth before harvesting a meaningful amount — lemongrass takes time to bulk up.

Why does lemongrass need to be in a container from the start?

Because the whole plant, roots included, has to move indoors before frost — planting it directly in garden soil means either abandoning it at season's end or the difficult task of digging up and potting a large, established root mass under time pressure. Starting in a container from day one makes the fall move simply a matter of carrying the pot inside.

How do I care for lemongrass indoors over winter?

Give it the brightest indoor spot available — a south-facing window is minimum, and supplemental grow light helps considerably, since a Canadian winter provides far less light than lemongrass wants. Growth slows dramatically indoors regardless; the goal for winter is keeping the plant alive, not productive, until it goes back outside in spring.

How do I harvest lemongrass?

Cut or twist off individual stalks at the base once they're at least 30 cm tall and about the thickness of a finger, taking outer stalks first and leaving the centre to keep producing. The tender lower few centimetres of each stalk (the part used in cooking) is more concentrated once the plant has had a full warm season to mature.

CANADA GROWING GUIDE

Growing Lemongrass in Canada — Container From the Start

Q: Is lemongrass hardy anywhere in Canada?

No — lemongrass (Cymbopogon citratus) is hardy only to roughly Zone 10, a tropical/subtropical rating no part of Canada reaches. It has zero realistic chance of surviving a Canadian winter outdoors, even in the mildest coastal BC gardens, and must be treated as a container plant that comes indoors for winter.

A tropical grass with zero hardiness anywhere in Canada — plant it in a container from day one so moving it indoors for winter is simple, not a rescue operation.

Lemongrass is about as far from cold-hardy as a garden herb gets — Zone 10, meaning no part of Canada, not even coastal BC, comes close to keeping it alive outdoors through winter.

The fix is simple if you plan for it from the start: grow it in a container all season, so bringing it indoors before frost is just carrying the pot in, not digging up an established root mass under time pressure.

Growing lemongrass in Canada: tropical (Zone 10) — zero hardiness, no part of Canada keeps it alive outdoors. Grow in a container from day one; move outdoors after last frost once nights are warm, bring back indoors well before first fall frost. Start from a rooted stalk rather than seed for faster, more reliable results.

When should you plant lemongrass where you garden?

Get your city's frost dates, indoor seed-starting dates, and this week's planting jobs — three free tools.

📅 What to Plant Now ❄️ Frost Dates 🌱 Seed Starting

🌱 Need seeds? West Coast Seeds (a BC company) sells untreated, Canadian-grown herb seed.

🥦 Shop herb seeds at West Coast Seeds →

🌿 Growing another tender herb? See Growing Rosemary in Canada — the same "container from day one" logic, though rosemary is at least much less frost-sensitive than lemongrass.

Why Lemongrass Has to Be a Container Plant Here

Lemongrass's Zone 10 rating puts it firmly out of reach of every Canadian climate, including the mildest coastal BC gardens. There's no microclimate trick or winter mulch that changes this — it simply has to come indoors.

Plant it in a container from the very start of the season — moving an established clump from open ground into a pot at the last minute before frost is far harder than simply relocating a pot that was always there.

Move the container outdoors after your last frost date once nights stay reliably warm, and bring it back in well before your first fall frost — lemongrass has essentially no frost tolerance at all, less even than most tender herbs.

Getting Lemongrass Through a Canadian Winter

Give it your brightest indoor spot

A south-facing window is the minimum; supplemental grow light helps significantly. Growth slows dramatically indoors regardless — the goal is survival, not production, until spring.

Water sparingly over winter

Slowed indoor growth means less water demand. Let the soil dry somewhat between waterings to avoid root rot during the dormant-ish winter period.

Divide an overgrown clump in spring

A container-grown lemongrass clump multiplies over a season or two. Dividing it when moving back outdoors in spring keeps the pot manageable and gives you extra plants.