How to Grow Alexanders Canada

By the SoilCommander Editorial Team, under the guidance of Nitin Sharma, Co-Founder · · How we check our facts

On this page
  1. Alexanders (Smyrnium olusatrum)
  2. Quick Facts
  3. Soil & Growing Conditions
  4. Growth Stages
  5. Harvest & Storage
  6. Alexanders, a Forgotten Pot Herb
  7. Plan your Alexanders planting
  8. Growing Alexanders in another region
  9. Sources

Alexanders (Smyrnium olusatrum) — biennial.

Core growing advice on this page is checked against named horticultural sources — see References.

Alexanders (Smyrnium olusatrum)

A mass of Alexanders plants growing wild — “Alexanders, Smyrnium olusatrum - geograph.org.uk - 7471399” by Chris Morgan is licensed under CC BY-SA 2.0.

4 sources cited · Verified

Quick Facts

A mass of Alexanders plants growing wild — “Alexanders, Smyrnium olusatrum - geograph.org.uk - 7471399” by Chris Morgan is licensed under CC BY-SA 2.0.
“Alexanders, Smyrnium olusatrum - geograph.org.uk - 7471399” by Chris Morgan is licensed under CC BY-SA 2.0.
Factor Value
Soil texture sand, clay, chalk or loam (RHS)
Drainage well-drained
Lifecycle biennial
Edible parts leaves, stems, flowers, seeds, roots

Soil & Growing Conditions

A whole flowering Alexanders plant — “Smyrnium olusatrum RF” by Robert Flogaus-Faust is licensed under CC BY 4.0.
“Smyrnium olusatrum RF” by Robert Flogaus-Faust is licensed under CC BY 4.0.

Water: moist but well-drained or well-drained (RHS)

Growth Stages

Close-up of Alexanders' greenish-yellow flower umbel — “(MHNT) Smyrnium olusatrum - inflorences - Jardin Botanique Henri GAUSSEN” by Didier Descouens is licensed under CC BY-SA 4.0.
“(MHNT) Smyrnium olusatrum - inflorences - Jardin Botanique Henri GAUSSEN” by Didier Descouens is licensed under CC BY-SA 4.0.
Stage BBCH Notes
Sowing 0 Propagate by seed, in free-draining soil in full sun (RHS).
Semi-evergreen leaf growth 3 Vibrant green, glossy leaves develop on the solid, later hollow and grooved stem, growing well in coastal areas (RHS, Foraging and More).
Flowering 6 Greenish-yellow flowers with a pungent, myrrh-like scent appear in umbrella-like clusters (RHS).
Harvest (all parts edible) 8 All parts can be harvested -- leaves, stems, flowers, seeds and roots -- with older leaves and stems typically cooked to reduce bitterness (Foraging and More).

Harvest & Storage

An Alexanders plant flowering among wildflowers in a field — “Smyrnium olusatrum Przewłoka warzywna 2023-02-22 02” by Agnieszka Kwiecień, Nova is licensed under CC BY-SA 4.0.
“Smyrnium olusatrum Przewłoka warzywna 2023-02-22 02” by Agnieszka Kwiecień, Nova is licensed under CC BY-SA 4.0.

When to pick: All parts are edible -- leaves, stems, flowers, seeds and roots -- with a very strong celery-like taste; older leaves and stems are typically cooked due to their bitterness (Foraging and More).

Plan your Alexanders planting

When to sow and plant Alexanders depends on your own frost dates. Check the Canada vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.

Growing Alexanders in another region

Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.

Sources

The full list of 4 sources behind this guide (Foraging and More, Foraging Course Company, Plants For A Future (PFAF) and others) is in the references of our UK guide to alexanders; they describe the plant itself, which is the same wherever it grows.

Plan next season before the problems start

Short-season growing is arithmetic before it is technique: days to maturity against frost-free days decides what will finish at all. The Canada Garden Planner does that subtraction for your region before you sow.

Get the Canada Garden Planner →

Instant PDF download · Written for Canadian growing conditions

SoilCommander Editorial Team — under the guidance of Nitin Sharma, Co-Founder

Every growing guide is checked against RHS, USDA Cooperative Extension, and other named horticultural authorities before publishing. How we check our facts.

How this guide is put together

The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against Canadian hardiness-zone and frost-date data, with provincial agriculture and university extension sources cited directly where one exists for a crop. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.

Vegetable Growing Guides Canada

Last verified 2026-09-02

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