When to plant Lemon Balm in Cool Australia

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

Raise lemon balm seedlings under cover in October and November, transplanting out once the soil has warmed. The seed of this hardy perennial herb (Melissa officinalis) is fine and slow, germinating anywhere from 7 to 28 days, and is best surface-sown or barely covered at 3 mm as light aids germination. Plant out 50 cm apart in rows 30–60 cm apart, and expect usable, leafy growth in around 70–80 days. In cool gardens around Hobart, Canberra and Ballarat, lemon balm dies back over winter and returns reliably each spring.

Sowing calendar — cool zone

Green months are your sowing window: October to November.

Growing notes

Lemon balm is an easy, forgiving perennial for the cool zone, hardy enough to shrug off frost and quick to re-establish each spring after dying back over winter. It grows happily in sun or part shade and is not fussy about soil, which makes it a low-effort source of lemon-scented leaves for teas and cooking in gardens around Orange and Armidale.

Its great vice, and the usual regret, is self-seeding and spread. Once established, lemon balm sets abundant seed and colonises surrounding ground, and its roots creep outward season by season. The fix is to cut it back hard before it flowers to prevent seeding, grow it in a large pot or a contained bed, and lift and divide clumps every couple of years to keep them vigorous and in bounds.

Germination is the fiddly part: the seed is tiny and needs light, so press it onto the mix rather than burying it, keep it moist, and be patient across the long 7–28 day window. Cutting the foliage regularly keeps growth soft and aromatic and delays flowering; plants left to bloom become woody and lose leaf quality. Powdery mildew can appear in humid, crowded conditions, so space plants and thin congested clumps to keep air moving.

Lemon Balm at a glance

Common questions

Does lemon balm come back every year?

Yes. It is a hardy perennial that dies back over a cool-climate winter and reshoots each spring. Once planted, it returns reliably for years and often self-seeds around the original clump.

How do I stop lemon balm spreading?

Cut it back before it flowers to stop it seeding, grow it in a pot or contained bed, and divide clumps every couple of years. Left unchecked it self-seeds freely and creeps outward through the garden.

Why is my lemon balm seed slow to germinate?

The seed is tiny and needs light to sprout, so it can take anywhere from 7 to 28 days. Surface-sow or barely cover it at 3 mm, keep it consistently moist, and give it the full window before assuming failure.

Can lemon balm survive Hobart winters?

Comfortably. Lemon balm is fully hardy and treats a Hobart winter as a rest period, dying back to the ground and returning with fresh growth in spring.

Keep exploring