When to plant Stock in Cool Australia

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

Raise stock seedlings under cover from January to April, transplanting once they hold three or four true leaves. Seed germinates in 10–20 days at a steady, cool temperature, so sow into trays kept out of harsh sun. Sow just 3 mm deep and press the mix down lightly, as stock germinates better with a little light. Space plants 20–40 cm apart with rows 20–30 cm across. Stock is fully hardy and takes a long run to flower, roughly 140 days, which is why an autumn sowing suits cool districts like Hobart, Orange and Armidale where the cold months develop strong, scented spikes for spring.

Sowing calendar — cool zone

Green months are your sowing window: January to April.

Growing notes

Stock rewards patience in the cold. In cool gardens, the long 140-day maturity means an autumn-sown crop sits through winter as a leafy rosette and then throws its fragrant flower spikes as the days lengthen. Give it an open, sunny position with free-draining soil; stock hates wet feet and will sulk in heavy, waterlogged ground through a Ballarat winter.

The most common failure here is damping-off in the seedling stage. Cold, damp trays with poor airflow rot young stems at soil level overnight. Sow thinly, water from below where you can, and keep trays somewhere bright and ventilated rather than a closed, humid spot. Once transplanted, mulch lightly and feed with a balanced fertiliser to build sturdy plants before the coldest weeks.

A second problem is leggy, floppy growth from too much shade or crowding. Give each plant its full 20–40 cm and pinch nothing; stock flowers on a single strong stem and does not need topping. In frost-prone spots like Canberra, the hardy foliage shrugs off cold, but a hard black frost can scorch open blooms, so an autumn sowing that flowers into milder spring gives the cleanest spikes.

Stock at a glance

Common questions

when to sow stock seeds in cool climate Australia

In cool zones, sow stock from January to April and raise the seedlings under cover. This autumn window lets plants establish before winter and flower through the following spring. The long 140-day maturity means earlier sowings give you the strongest scented spikes.

why are my stock seedlings dying at the base

That is almost always damping-off, a fungal collapse of the stem at soil level in cold, damp, still air. Sow thinly, improve airflow around the trays, and water from below rather than overhead. Keeping seedlings bright and ventilated is the best prevention.

does stock survive frost in Canberra

Yes, stock is fully hardy and its foliage tolerates Canberra frosts without trouble. A hard black frost can mark open flowers, so timing an autumn sowing to bloom into milder spring gives cleaner spikes. The plants themselves come through winter reliably.

how far apart to plant stock

Space stock 20–40 cm apart with rows 20–30 cm across. Give the wider spacing in rich soil where plants grow large, and the closer spacing for compact bedding types. Good spacing keeps airflow up and reduces mildew.

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