How to Grow Carrot in Australia

Carrots demand more soil preparation than almost any other vegetable, but in a well-built raised bed, much of this work is already done for you. The key requirements are deep (30cm+), loose, stone-free, well-drained soil with no fresh manure (which causes forking and hairy roots). If your raised bed mix is heavy in compost, add some coarse propagating sand to improve drainage and texture.

Carrot seed is tiny and slow to germinate — patience is essential. Sow seed shallowly (5mm deep) in rows or broadcast across a wide band, thinning to 6–8cm spacing once seedlings reach 5cm tall. Keep the surface moist during the 10–20 day germination period — a layer of fine vermiculite or shade cloth draped over the bed helps retain moisture without crusting. Don't let the surface dry out, as carrot seeds will fail to germinate in dry conditions.

Choose variety length to match your bed depth. Short-rooted varieties like 'Paris Market' (round) and 'Chantenay Red Cored' suit shallower beds (20–25cm deep); standard varieties like 'Nantes' and 'Melbourne Market' need 25–30cm; long varieties like 'Detroit Dark Red' and 'Yates Top Weight' need 30cm+.

Carrots do not transplant — always direct sow. They are slow to establish and can be interplanted with quick-maturing radish, which breaks up the soil as it grows and is harvested before carrots need the space. Succession sow every 4–6 weeks for continuous harvest through autumn, winter, and spring.