What to plant in your New Zealand garden this May

May is the point in the year when most casual gardeners pack it in for winter and experienced ones get really busy. The soil is still holding warmth from summer, the rain is reliable, the bugs are gone, and anything you plant now has six months to settle in before spring. If you missed April, this month is your second chance.

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.

Winter greens — the everywhere crops

These go in nationwide this month and feed you right through the short days:

• Silverbeet and kale — the two toughest leafy greens in the NZ vegetable patch. Frost sweetens the kale.
• Spinach — true spinach finally stops bolting. Sow direct; thin as you eat.
• Cabbage, cauliflower, broccoli — plant seedlings now for winter heads. Net against white butterfly until the first real cold.
• Brussels sprouts — need frost for best flavour. Stake tall ones.
• Rocket and mesclun — milder in autumn than in summer heat. Ready in six weeks.
• Leek and spring onion — quiet winter growers that flush in spring.

Warm north — squeeze in the last of autumn

North of Taupō the soil stays warm well into May. If you’ve got a sheltered corner, you can still plant strawberry runners, pop in citrus trees (Meyer lemon, mandarin), and sow one last round of radishes. Glasshouse owners can keep lettuce, bok choy and coriander going all winter.

Cold south — garlic window opens

In Central Otago, Southland and the high country, your first proper frost is either arrived or imminent. The star of the show this month is garlic — the shortest day to longest day rule is a good approximation, but cold-region gardeners can plant from late April through to July. Plant cloves pointy-end-up, 5cm deep, in well-drained soil. Broad beans also go in now — they’ll sit quietly through winter and flower first thing in spring.

Bulbs and spring colour

If you want a spring garden, now is the time. Tulips, daffodils, freesias, ranunculus, anemones and Dutch iris all go in during autumn and will sulk if you wait until August. In warm regions, chill tulip bulbs in the fridge for six weeks before planting — they need a cold trick to flower properly. Everywhere else, bury them 15cm deep and forget about them until July.

Trees and shrubs — bare-root season is coming

May is the transition month for tree planting. Natives still go in well — kōwhai, tī kōuka (cabbage tree), harakeke (flax), mānuka and five-finger will all establish faster planted now than in spring. Deciduous fruit trees are sold bare-root from late May onwards. Use this month to prepare planting sites: dig generous holes, incorporate compost, and sort out your pollinator pairings.

What NOT to plant this month

Anything heat-loving. Tomatoes, capsicum, chilli, cucumber, zucchini, pumpkin, sweetcorn, beans and basil are all October–November crops. Even in the warm north, May soil is already below the 15°C threshold they need. Save yourself the disappointment and wait.

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.