How to Grow Carrots in New Zealand
Updated June 2026
Carrots are one of the most rewarding crops in a New Zealand garden, and one of the easiest to get slightly wrong. The secret is not feeding or fussing, it is the soil. Loose, fine, stone-free ground gives you long straight roots, while lumpy or freshly manured beds give you forks and twists.
Carrots are sown straight into the bed where they will grow. They hate being transplanted, so do not start them in punnets. The seed is fine and slow to wake up, often taking two to three weeks to appear, so patience and a damp surface are everything in the first fortnight.
In the warm north you can sow carrots almost all year. In the cooler south the window is shorter but the cool, steady autumn gives some of the sweetest roots of the season. Use the calculator below to work out how many seeds to sow and what you will end up with after thinning.
Carrot sowing and thinning calculator
What it looks like as it grows
Position and soil
Carrots want full sun and the lightest, finest soil you can give them. Before sowing, dig the bed over to at least a spade's depth and break up every clod. Remove stones, sticks and old roots, because anything in the way makes the carrot fork around it.
Do not add fresh manure or high-nitrogen fertiliser. Rich soil pushes lots of leafy top growth and hairy, forked roots. If your soil is heavy clay, either grow short stumpy varieties like Chantenay or build a raised bed filled with a sandy, free-draining mix. A handful of old compost worked in is fine, but keep it gentle.
Sowing
Sow carrot seed direct, about 1cm deep, into a finely raked seedbed. Mix the fine seed with a little dry sand to spread it more evenly and avoid sowing too thick. Water the row gently and keep the surface damp until the seedlings appear, which can take two to three weeks.
A common trick is to lay a board or a sheet of damp hessian over the row to hold moisture, lifting it the moment the first green shows. Sow a short row every three to four weeks for a steady supply rather than a single glut.
Spacing and thinning
Thin in stages. The first thin happens when the seedlings are a few centimetres tall, removing the weakest to leave about 2cm between plants. A second thin a few weeks later takes them out to their final spacing of 3 to 5cm. Closer spacing gives smaller, sweeter carrots, wider spacing gives bigger roots.
Thin on a still evening and firm the soil back around the remaining plants. The crushed foliage smell attracts carrot rust fly, so do not leave thinnings lying on the bed. The baby thinnings are delicious in a salad.
Watering and feeding
Keep the soil evenly moist, especially during germination and through dry spells. Erratic watering, a dry patch followed by a soaking, is the main cause of split roots. Carrots need very little feeding. If the leaves look pale you can give a light liquid feed, but avoid anything heavy in nitrogen.
Common problems
Forked or twisted roots
Caused by stones, lumpy soil or fresh manure. Dig the bed deep and fine before sowing, and never add fresh manure to a carrot bed.
Carrot rust fly
The larvae tunnel into the roots leaving rusty trails. Cover the bed with fine insect mesh, thin in the evening, and firm the soil back to hide the scent. See our NZ pest and disease guide for organic control.
Split or cracked roots
Uneven watering, often a heavy soak after a dry spell. Keep moisture steady and mulch lightly to even it out.
All leaf and no root
Too much nitrogen or too much shade. Move to a sunnier spot and lay off the rich feeding.
Harvest and storage
Baby carrots are ready in about 8 to 10 weeks, maincrop carrots in 12 to 16 weeks. Pull a test carrot to check the size before lifting the whole row. Water the bed first if the ground is hard, then ease the roots out by hand or with a fork.
Carrots store well left in the ground in milder regions, pulled as you need them. For longer storage, twist off the tops and keep the roots in a box of damp sand in a cool dark place. The tops draw moisture out of the root, so always remove them before storing.
Best carrot varieties for NZ
| Variety | Notes |
|---|---|
| Nantes / Topweight | Sweet, blunt-tipped all-rounder, the reliable home garden choice. (Kings Seeds, Egmont Seeds) |
| Egmont Gold | A New Zealand favourite maincrop, heavy cropping and good for storing. (Egmont Seeds) |
| Chantenay | Short, broad-shouldered roots that cope with heavier soils. (Kings Seeds, Egmont Seeds) |
| Baby / Amsterdam Forcing | Fast, slender baby carrots, ideal for containers and early sowing. (Kings Seeds) |
| Purple Dragon | Purple skin with an orange core, a colourful novelty that tastes sweet. (Kings Seeds, Egmont Seeds) |
When to sow by region
New Zealand stretches across many climates, and carrots do not all go in at the same time. As a guide for the southern hemisphere seasons:
- Warm north (Auckland, Northland): sow from August to April, almost year round.
- Temperate (Waikato, Wellington, Nelson): sow September to March.
- Cooler south (Canterbury, Otago, Southland): sow October to February.
- Central Otago (cold inland): sow October to January.
Track your carrots from seed to harvest
The Planting Season app gives you a sowing calendar tuned to your exact New Zealand region, thinning reminders, and a harvest log that tots up what you have grown.
Open the app →FAQ
When is the best time to sow carrots in New Zealand?
In the warm north (Auckland, Northland) sow from August to April. Temperate regions sow September to March, cooler southern regions October to February, and Central Otago October to January. Carrots are sown direct, not transplanted.
Why are my carrots forked or twisted?
Forked roots come from stony or freshly manured soil. Dig the bed deep, remove stones, and never add fresh manure before sowing. Loose, fine, low-nitrogen soil gives long straight roots.
How deep do I sow carrot seed?
Sow carrot seed about 1cm deep in a fine seedbed. Keep the surface damp until the seedlings appear, which can take two to three weeks.
How far apart should I thin carrots?
Thin in stages to a final spacing of 3 to 5cm between plants. Closer spacing gives smaller, sweeter carrots, wider spacing gives larger roots.
How do I avoid carrot rust fly?
Carrot rust fly is drawn to the smell of crushed foliage. Thin on a still evening, firm the soil back, and cover the bed with fine insect mesh. Avoid leaving thinnings lying about.
How long do carrots take to grow?
Baby carrots are ready in about 8 to 10 weeks. Maincrop carrots take 12 to 16 weeks. You can leave them in the ground and pull as needed.
Where can I buy carrot seed in NZ?
Try Kings Seeds and Egmont Seeds for a good range of carrot varieties suited to New Zealand conditions.