How to Grow Tree Collards Canada
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Tree collards (Brassica oleracea var. acephala) — perennial or partial perennial, living several years.
Unlike an annual crop, the work here is front-loaded into establishment: get the planting and the site right and the same plants crop for several seasons.
Core growing advice on this page is checked against named horticultural sources — see References.
Tree Collard (Brassica oleracea var. acephala)
1 sources cited · Single source
Soil & Growing Conditions
Water: moderate, in rich fertile soil (Gardening Know How)
Growth Stages
| Stage | BBCH | Notes |
|---|---|---|
| Propagation | 0 | Take 12-inch stem cuttings in spring, plant vertically with a third above the soil; rooting takes about six weeks (Gardening Know How). |
| Establishment | 3 | Full sun preferred, though partial shade produces more tender leaves; well-draining, nutrient-rich soil, moderate water (Gardening Know How). |
| Perennial growth | 3 | Develops a tall, woody stem up to 12ft over multiple years; prune every few months to the first leaf axil to prevent it becoming tall, spindly and leggy (Gardening Know How). |
| Leaf harvest | 8 | Harvest young leaves for sweetness year-round in mild climates, never taking more than a third of the foliage at once (Gardening Know How). |
Quick Facts
| Factor | Value |
|---|---|
| Soil texture | well-draining, nutrient-rich; tolerates heavy clay (Gardening Know How) |
| Drainage | well-drained |
| Lifecycle | perennial or partial perennial, living several years |
| Edible parts | leaves |
At a Glance
Harvest & Storage
When to pick: Harvest young leaves for their sweetness -- all foliage is edible, but older leaves need cooking. Never take more than a third of a plant's foliage at once. Leaves keep several days refrigerated (Gardening Know How).
Diseases
Pests
Tree Collard, Cutting to Woody Perennial
Plan your Tree Collards planting
When to sow and plant Tree Collards 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 Tree Collard 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 1 sources behind this guide (Gardening Know How) is in the references of our UK guide to tree collards; they describe the plant itself, which is the same wherever it grows.
Frequently Asked Questions
What problems affect tree collards?
Our data links 1 disease and 1 pest to this crop. See the sections above for each one and how to manage it.
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
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
Related Problem Guides
Last verified 2026-08-29
Related guides
More from the same group (brassicas & mustards):
Growing advice for your part of Canada
Timing and conditions change a lot inside one country. These guides cover frost dates and growing seasons region by region.
Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Keep going
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.