What to plant in your New Zealand garden this October

October is the month the summer garden finally arrives. Frost risk is mostly behind us in the north, soil temperature is climbing past 15°C, and the Labour Weekend tomato-planting tradition is genuinely sound agronomy — it’s the earliest you can reasonably expect tomatoes to survive without heat-lover stunting.

What you should plant this month depends enormously on where you are. A gardener in Whangārei has a completely different window from one in Alexandra. Our free interactive tool — the Newswire NZ Gardener’s Planting Calendar — lets you pick your region and see exactly what to sow, plant and harvest this month for your patch. Worth keeping open in a tab while you read the rest.

Labour Weekend — plant the tomatoes

Everyone in New Zealand has a nana or uncle who says “never plant tomatoes before Labour Weekend.” They’re usually right. The last frosts in most of the country are in October, soil temperature stabilises around now, and plants set out later catch up with earlier ones within two weeks. Stake at planting, mulch, and pinch laterals on indeterminate types.

Warm-soil crops to plant now

• Capsicum, chilli, eggplant — outdoors in the warm north; under cover elsewhere for another fortnight.
• Cucumber, zucchini, pumpkin — direct sow once soil is warm (check with a thermometer).
• Sweet corn — plant in blocks of four rows minimum for wind pollination.
• Beans — dwarf and climbing go in direct. Sow every three weeks for a continuous crop.
• Basil — outdoor sowing works in Auckland onwards; the south can wait until November.

Kūmara — warm north only

Kūmara slips (tupu) are the last of the summer plantings to go in. Plant them in warm, sandy, well-drained mounds from mid-October in Northland and coastal Auckland. Everywhere else, wait for November at the earliest. Kūmara needs a long warm growing season and won’t thrive south of Christchurch.

Keep succession sowing

October is when the salad garden hits its stride. Succession sow lettuce, spinach, rocket, coriander and radish every two to three weeks for a continuous supply. Plant spring onions, leek seedlings and more carrots. Thin what’s already coming through.

Cold south — finally the main event

In Central Otago and Southland, October is your September — everything the north did a month ago, you do now. Potatoes still go in. Peas, broad beans, brassicas. The first hardy flowers and dahlias. Tomatoes stay in the glasshouse until the end of the month.

Ornamentals

Dahlia tubers still go in. Plant out summer annuals — cosmos, zinnia, marigold, sunflower, sweet pea. Roses are coming into full bloom; feed them with a rose-specific fertiliser and keep them watered.

Strawberries flowering

Strawberry plants are flowering and starting to fruit. Mulch thickly with straw (that’s where the name comes from) to keep the fruit clean and conserve moisture. Net against birds once the first fruit starts to blush.

What NOT to plant this month

Brassicas for summer harvest — cabbage, cauliflower and broccoli need cool weather and will bolt in mid-summer heat. Save those for late December sowing aimed at autumn harvests.

Use the tool

The hardest part of gardening in Aotearoa is that generic planting advice — the kind you’ll find on the back of seed packets imported from the UK or California — is almost always wrong for our conditions. Even advice written for New Zealand is often written for Auckland and quietly fails gardeners south of Christchurch.

That’s why we built the Newswire NZ Gardener’s Planting Calendar. Pick your region once, and it shows you exactly what to sow, transplant, and harvest this month — plus a reverse lookup where you can type in any plant (tomato, feijoa, dahlia, pōhutukawa) and see the ideal window for your patch. It’s free, it works on your phone, and it’ll save you a lot of guesswork.

What are you planting this month? Drop a comment below and tell us what’s going in the ground in your garden — and which region you’re in, so other readers can compare notes.

This article was written by AI, briefed to report the facts, hopefully without some of the bias people bring to the job 🙂