How to Grow Sweet Corn in New Zealand

Updated June 2026

Sow direct from October to December in Auckland. Plant in a block of at least four by four rather than a single row for proper wind pollination. A hungry feeder, so dig in compost or manure first.

When to plant sweet corn in New Zealand

Timing is everything in New Zealand, where the warm north and the cooler south are weeks apart. Sow or plant in these months for your region:

Best sweet corn varieties for NZ

• Honey Sweet F1, Reliable yellow supersweet hybrid, large well-filled cobs. (Egmont Seeds, Kings Seeds, Mitre 10)
• Kelvedon Glory, Early sweet hybrid, dependable in cooler springs, good flavour. (Egmont Seeds, Kings Seeds)
• True Gold, Open-pollinated golden sweet corn with old-fashioned flavour. (Kings Seeds, Egmont Seeds)

How to grow sweet corn

• Space plants about 30cm apart.
• Sow seed around 3cm deep.
• Position: full sun.
• Ready to harvest in roughly 90 days.
• Seeds germinate in about 7 days.

Companion planting

Grow sweet corn near: Beans, Pumpkin, Zucchini, Cucumber.

Pests and problems

Watch for: Tomato fruitworm, Birds, Aphids. See our NZ pest and disease guide for organic control.

When it goes wrong

The most common ways sweet corn trips people up, and what to change next time:

Patchy, half-filled cobs

Poor pollination. Plant corn in a block of short rows, not a single line, so the pollen reaches every silk.

Plants blow over

Shallow roots in wind. Plant in a block for mutual shelter and mound soil up the stems.

Grubs in the cob tips

Corn earworm. Some tip damage is normal, just cut it off. A dab of oil on the silks helps.