How to Grow Tomatoes in New Zealand

Updated June 2026

Varieties, planting times, feeding, pots and staking for every region from Kerikeri to Invercargill

Tomatoes are the favourite summer crop in the New Zealand home garden, and for good reason. Nothing from a supermarket comes close to a tomato picked warm and ripe straight off the vine. A handful of well-chosen plants will keep a family in salads, sandwiches and sauce right through the season.

Two decisions matter more than anything else: which variety you grow, and when you plant it out. Get those right and the rest is easy. Use the interactive variety picker below to find the right tomato for how you want to use it, including a one-tick filter for the sweetest tomatoes you can grow.

What it looks like as it grows

When to Plant in Your Region

Tomatoes are frost-tender, so plant them out only after the last frost in spring, once the soil and the nights have warmed up. A cold check in the ground stalls young plants for weeks. In the warm north you can start early. In the cold south you wait, then lean on early varieties and a little protection.

To get a head start, New Zealand gardeners often sow tomato seed indoors 6 to 8 weeks before the last frost, then harden the seedlings off before planting out.

For a calendar tuned to your exact spot, use Find My Region or open the Planting Season app.

One more thing to understand before you choose a variety: tomatoes come in two growth habits. Determinate (bush) types grow to a fixed size and ripen one concentrated flush of fruit, which is ideal for sauce and bottling and for pots, and they need little pruning. Indeterminate (vine) types keep growing and fruiting all season, so they reward you over a long stretch but need staking and regular pruning.

Tomato Variety Picker

There is no single best tomato, only the best tomato for what you want to do with it. Use the picker to filter by use, growth habit, or tick Sweetest only to find the sweetest types. Every variety listed is a real one grown in New Zealand gardens.

No varieties match those filters. Try clearing the sweetest toggle or changing the use.

Feeding Tomatoes

Tomatoes are heavy feeders, but what they need changes through the season. Match the feed to the stage and you get fruit instead of a leafy green bush.

• Early (planting to first flowers). Nitrogen helps build a strong plant, but go easy. Compost and aged manure dug in at planting usually cover this stage. Too much nitrogen now gives you a big green bush and very little fruit.
• Flowering and fruiting. Switch to potassium (potash), which drives fruit set and flavour. Liquid feed every one to two weeks once flowers appear, using a tomato or flowering-plant fertiliser.

Organic feeding options

• Compost and worm castings. Top-dress around the plants through the season. This is the homestead loop in action: your kitchen scraps feed the worm farm, and the worm farm feeds the tomato bed.
• Comfrey tea. A free, high-potassium liquid feed made by steeping comfrey leaves in water. Ideal once fruit is forming.
• Blood and bone. A slow-release source of nitrogen and phosphorus. Work it into the bed before planting.

If your plant is dark green and leafy but setting no fruit, it has had too much nitrogen. Cut the nitrogen and switch to a potassium-rich feed to turn that growth into tomatoes.

Growing Tomatoes in Pots and Containers

• Pot size. Use a pot of at least 40 cm (about 40 litre) for a full-size tomato. Dwarf and bush types are happy in a 30 cm pot.
• Best container varieties. Choose compact determinate or dwarf types. Tumbling Tom is made for hanging baskets, Patio and Roma do well in pots, and Tommy Toe thrives in a large tub.
• Watering. Water daily in summer and never let the mix dry out, as uneven watering invites blossom end rot.
• Feeding. Feed weekly once flowering, because potting mix runs out of nutrients fast.

Pruning and Staking

How you prune depends entirely on the growth habit, so check your variety first.

• Indeterminate (vine) types. Remove the side shoots, also called laterals or suckers, that form in the leaf axils where a branch meets the main stem. This puts the plant's energy into fruit. Tie the main stem to a stake as it grows.
• Determinate (bush) types. Do not prune the laterals. On a bush tomato those side shoots carry much of your crop, so removing them cuts your harvest. Just support the plant with a stake or cage.

Support options:

• Single stake. Drive in a sturdy stake and tie the main stem to it with soft ties as it grows.
• Tomato cage. A wire cage works well for bushy determinate types that hold themselves up.
• String or twine trellis. Run a length of twine from above and twist the growing stem around it. Good for vine types in a glasshouse or tunnel.

Put your stake in at planting time, not later, so you do not drive it through the root ball of an established plant.

Common Problems

Blossom end rot

A sunken dark patch on the base of the fruit. It is a calcium problem brought on by uneven watering rather than a disease. Water evenly and consistently, and mulch to keep soil moisture steady, especially for plants in pots.

Tomato/potato psyllid

A serious New Zealand pest. The tiny nymphs feed on the undersides of leaves and spread a bacterium that causes psyllid yellows, stunting the plant and ruining the crop. Check the undersides of leaves regularly, use a fine mesh cover to keep adults off, and remove badly affected plants before the problem spreads.

Early and late blight

Fungal diseases that are worst in humid New Zealand summers, showing as brown spots and rapidly collapsing foliage. Space plants for airflow, avoid overhead watering, remove affected leaves promptly, rotate where you grow tomatoes each year, and never compost blighted plants.

Fruit cracking

Splits in the skin, usually after rain following a dry spell, when the fruit takes up water faster than the skin can stretch. Even, regular watering and a good layer of mulch keep moisture steady and prevent most cracking.

Flowers but no fruit

If plants flower but do not set, heat is the usual cause. Above about 30 degrees Celsius the pollen fails and flowers drop. Shade plants during heatwaves, keep the water up, and choose heat-tolerant types in hot districts. Too much nitrogen also stops fruit set, so ease off and switch to potassium. Set usually returns once the weather cools.

Plan Your Varieties in the App

The picker helps you decide, and the app helps you grow it. When you add a tomato you choose your variety from the in-app dropdown, and the app tracks it from sowing through to harvest with reminders tuned to your New Zealand region. Grow a cherry for snacking, a paste type for sauce and a beefsteak for sandwiches all on the one plan, and see exactly what to do next for each. Open the Planting Season app to get started.

Frequently Asked Questions

See also: Tomato in the Plant Library and How to Grow Strawberries