When to plant Lemon Balm in Temperate Australia
Temperate zone — applies to Sydney, Melbourne, Adelaide, Perth, Newcastle and similar areas. Growing elsewhere? Cool · Subtropical · Tropical · Arid.
Raise lemon balm from seedlings and transplant out, sowing in the milder shoulders of the year from March to April and again from September to December. This hardy perennial herb has fine seed that needs light to germinate, so barely cover it at 3 mm and expect a variable 7–28 days to sprout. Space transplants a generous 50 cm apart with 30–60 cm between rows, as established clumps spread widely. Leaves are ready to pick in around 70–80 days. In temperate gardens around Melbourne, Adelaide and Newcastle, lemon balm settles into a semi-shaded, moist corner and returns reliably each spring.
Sowing calendar — temperate zone
Green months are your sowing window: March to April and September to December.
Growing notes
Lemon balm is an easygoing perennial in the mint family, grown for its lemon-scented leaves. Once established it is almost indestructible, so the main jobs are getting it going and then keeping it in bounds.
Start the fine seed in warmth and do not bury it, since it needs light to germinate; press it onto the surface and cover only to 3 mm. Germination is famously erratic, spread over anywhere from one to four weeks, so do not give up on a tray too early. Transplant seedlings once they are sturdy, choosing a spot with morning sun and some afternoon shade in hotter temperate gardens; full Adelaide or Perth summer sun can scorch the leaves and turn them papery.
Like its mint relatives, lemon balm spreads and self-seeds vigorously. The classic failure is letting it flower and seed unchecked, after which seedlings pop up across the garden for years. The fix is to trim plants back hard before they flower, which both curbs the spread and encourages fresh, aromatic new growth. Growing it in a pot or contained bed is wise if you value a tidy garden.
Cut plants back to the ground in late autumn and they will reshoot vigorously in spring. Regular harvesting keeps the clump bushy and productive.
Lemon Balm at a glance
| Sowing depth | 3 mm |
|---|---|
| Plant spacing | 50 cm |
| Row spacing | 30-60 cm |
| Germination | 7-28 days |
| Days to maturity | 70-80 days |
| Frost tolerance | Hardy |
| Method | Plant Seedlings |
Common questions
- Does lemon balm come back every year?
- Yes, lemon balm is a hardy perennial that dies back in winter and reshoots strongly each spring. In temperate gardens a single plant can last for years with little care.
- Why is my lemon balm seed not germinating?
- Lemon balm seed needs light and is naturally erratic, taking anywhere from 7 to 28 days. Surface-sow and cover only lightly to 3 mm, keep the mix warm and moist, and give the tray plenty of time before giving up.
- How do I stop lemon balm spreading everywhere?
- Lemon balm self-seeds freely, so trim plants back before they flower to prevent seedlings appearing across the garden. Growing it in a pot or a contained bed keeps it firmly in check.
- Does lemon balm grow well in Melbourne?
- Very well. Melbourne's temperate climate suits it, particularly a spot with morning sun and afternoon shade to protect the leaves from scorching. Keep the soil moist and it will thrive for years.
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