When to plant Rhubarb in Cool Australia

Cool zone — applies to Hobart, Canberra, Ballarat, Orange, Armidale and similar areas. Growing elsewhere? Temperate · Tropical · Subtropical · Arid.

Sow rhubarb direct in October or November in the cool zone — a deliberately narrow window, because the young plants are frost tender and need to emerge after the late-October to November last frosts have passed. Hobart and Armidale gardeners are otherwise well placed for this crop, and seed germinates quickly in warming spring soil, in around 5–10 days. Allow 100–140 days for plants to establish, at a generous 40–50 cm spacing with rows 40–60 cm apart. Sown at 10 mm deep in rich soil, a spring sowing builds a plant that will occupy its corner for years.

Sowing calendar — cool zone

Green months are your sowing window: October to November.

Growing notes

The timing logic is all about the seedling stage. In a district like Armidale or Ballarat, frosts can run into November, so sow at the later end of the window if your garden sits in a frost hollow — an October sowing caught by a freak late frost can be wiped out overnight, which is the risk that keeps this window so tight. Once through their first summer and properly established, plants settle into a rhythm of dying down in the cold months and re-emerging in spring; it is the young, newly germinated plants that cannot take a freeze.

Give rhubarb the best position you can spare permanently: deep, rich soil with plenty of compost or aged manure, full sun, and reliable moisture through its first summer. At 40–50 cm spacing the plants look absurdly far apart as seedlings — hold your nerve, because mature crowns fill every centimetre.

The most common failure is greed in the first season. The 100–140 days to maturity gets the plant established, but pulling stems hard in year one starves the crown and produces a permanently weak plant; take nothing, or at most a stem or two, until the second spring. When you do harvest, pull stems with a twist rather than cutting, and never eat the leaves — they are toxic and belong in the compost.

Rhubarb at a glance

Common questions

When should I plant rhubarb seed in Hobart?

Sow direct in October or November, after the danger of late frosts has passed. The seedlings are frost tender even though the crop suits cold-climate gardens once established.

How long before I can pick rhubarb grown from seed?

Plants take 100–140 days to establish, but resist harvesting in the first season. Let the crown build strength and start pulling stems from the second spring for a plant that lasts years.

Why did my rhubarb seedlings die after a cold night?

Young rhubarb plants are frost tender, and a late spring frost can kill them outright. If your garden is frost-prone, sow at the November end of the window rather than early October.

Are rhubarb leaves safe to eat?

No — only the stems are edible. The leaves are toxic and should go in the compost, where they break down safely.

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