New Zealand’s vegetable gardening calendar runs differently to what you’ll find in British or American guides. Our seasons are flipped, our climate varies enormously from Northland to Southland, and a lot of the advice that circulates online simply doesn’t apply here. This guide is written for NZ conditions, so you can stop second-guessing the timing and just get on with it.
NZ Growing Zones: What You Need to Know
There are three broad zones to work with.
Warm/Northern (Northland, Auckland, Bay of Plenty) has the longest frost-free windows and mild winters. Gardeners here can push both ends of the season.
Temperate/Central (Waikato, Taranaki, Wellington, Nelson, Christchurch) has proper seasons — cold winters, warm summers — and suits a wide range of vegetables with good timing.
Cool/Southern (Otago, Southland) has shorter summers and harder winters. Fast-maturing varieties and cold-tolerant selections are the sensible choice here.
Warm zones can generally shift two to four weeks earlier than the dates in this guide. Cool zones should move the same amount later.
January
January can be tough on a garden. Soil dries out fast, and plants that looked great in November start to struggle if watering drops off. The smart move is to stick to fast crops that won’t sit there suffering in the heat and go to seed before you can eat them.
What to plant: Beans, beetroot, carrots, spring onions, lettuce (choose bolt-resistant varieties), radish, silverbeet, cucumbers, zucchini.
Succession sow every two to three weeks rather than doing one big planting. You’ll get a much more useful harvest and avoid the glut-and-gap cycle. Water in the mornings rather than evenings to keep disease pressure down, and if beds aren’t mulched already, sort that out now.
February
The heat starts to back off through February and you’ve still got warm soil to work with, which is exactly the right condition for getting brassicas established before autumn sets in. Broccoli, cauliflower, and cabbage started now will head up properly before the cold arrives — leave it much later and you’re fighting the calendar.
What to plant: Broccoli, cabbage, cauliflower, beetroot, carrots, spinach, kale.
If summer crops are looking pale or the older leaves are yellowing, that’s often magnesium deficiency rather than a general feeding problem. A foliar application of SeaFeed addresses this directly — it carries 6,000 mg/L of magnesium along with boron and a range of other trace elements that standard NPK fertilisers don’t cover. It’s cold-extracted from NZ wild-harvested seaweed, which matters because heat degrades the bioactive compounds that actually do the work.
March
March is genuinely one of the best months in the vegetable garden. Warm soil, cooling nights, brassicas are happy, and there’s enough season left to get real production from whatever you plant now. Don’t waste it.
What to plant: Broccoli, cauliflower, cabbage, silverbeet, beetroot, spinach, spring onions.
Mulch heavily as temperatures start dropping at night. It holds warmth in the soil, keeps moisture where it’s needed, and reduces the watering frequency through the drier parts of autumn considerably. If you’re running liquid fertilisers through the season, this is a good time to keep the rotation going — consistent feeding through autumn helps plants go into winter in better condition.
April
Root crops settle in well during April’s cooler conditions, and peas can go in now across most of the country. In warmer regions, garlic can go in from April onwards. It needs a period of cold to develop properly, so there’s no benefit in planting it earlier.
What to plant: Beetroot, carrots, radish, spinach, peas, lettuce, garlic (warm zones).
Growth is slowing, but it hasn’t stopped. If you’ve been running a granular base fertiliser through the season, SteadyGro’s coated urea release is still working with the soil temperature, so there’s still nitrogen available to crops even as things cool down. That steady supply matters more than people realise for autumn root development.
May
Growth slows noticeably in May, especially south of Wellington and at altitude. That’s not a problem — it’s the garden adjusting. The goal now is to get the right crops in for winter and not chase varieties that won’t perform in the cold.
What to plant: Broad beans, onions, spinach, garlic (nationwide by now), lettuce (cold-hardy varieties).
Broad beans planted in May will outperform anything planted in late winter or spring. They get a proper cold period, develop a stronger root system, and produce better. If you’re in a frost-prone area, plant them out with a bit of protection — a cloche or fleece over young plants on the worst nights is usually enough.
June
Winter proper. The planting list gets short, but it doesn’t disappear entirely.
What to plant: Broad beans, peas, onions, garlic.
In areas with regular frosts, cloches or a basic tunnel house extend what’s possible by a meaningful margin. Even just a few degrees of overnight protection changes what you can grow through winter. It doesn’t need to be complicated — old windows propped over raised beds work fine.
July
The quietest month in the garden, but a good one for getting organised. Planting is limited, but preparation isn’t.
What to plant: Garlic (if not already in), broad beans, peas.
July is the right time to start tomatoes, capsicums, and chillies from seed indoors. They need a long lead time, and plants started now will be ready for outdoor transplanting in October or November with a proper root system behind them. Starting them in September gives you something smaller and less established, which shows up in the harvest later.
It’s also a good time to prepare beds for spring. Dig in compost, check your pH (most vegetables prefer 6.0–7.0), and plan what’s going where. If you’re going to apply SteadyGro as your base fertiliser, do it in August or September once soil temperatures start rising — that’s when the coated release mechanism works as intended.
August
Spring is close. Soil temperatures are rising in the North Island and coastal parts of the South Island, and the longer days start to shift how the garden behaves.
What to plant: Potatoes (warmer regions), peas, spinach, broccoli, cabbage, lettuce, beetroot.
August is the right month to apply SteadyGro to beds you’re preparing for the season. At 50–100 g per m², it’ll carry the base nutrition — 18% nitrogen, 6% phosphorus, 12% potassium, plus sulphur, magnesium, and trace elements — through to mid-season without needing constant reapplication. The nitrogen releases gradually as soil temperature rises, which means no burn risk and no leaching loss after heavy rain. Apply it now, water it in, and you’re set to focus your monthly liquid applications on supporting active growth and soil biology rather than chasing the NPK baseline.
September
One of the biggest planting months of the year. Soil is warming, frost risk is dropping in most regions, and the list of what you can sow or transplant opens up considerably.
What to plant: Tomatoes (warm zones and under glass), cucumbers, zucchini, beans, corn, pumpkins, capsicum, lettuce, carrots, beetroot.
Inland and southern areas should hold off on frost-sensitive crops (tomatoes, capsicum, basil) until late October. Putting them out too early doesn’t gain you anything and usually sets the plants back.
September is the time to get your weekly liquid rotation started. SeaFeed, BioSpark, FishBio, and VegeBoost each do something different, and rotating through them covers more bases than using any single product every time. BioSpark is worth paying attention to at the start of the season in particular. The VAM (Vesicular Arbuscular Mycorrhizae) component colonises root systems and extends hyphae into the soil profile further than root hairs can reach, improving access to phosphorus and bound trace minerals. On soils that have been low in biological activity through winter, getting that mycorrhizal network re-established early has a real payoff through summer.
October
The classic spring burst. Frost risk drops to near zero across most of the country, and you can plant with confidence.
What to plant: Tomatoes, peppers, chillies, pumpkins, courgettes, beans, sweetcorn, potatoes.
Stake tomatoes at planting time, not after they’ve grown. Disturbing established roots causes more stress than most people account for. The same logic applies to feeding — consistent, regular applications through the season deliver better results than one heavy feed followed by neglect.
VegeBoost is a good addition to the rotation from October onwards. Its 60% organic matter content contributes to soil biology with every application, not just plant nutrition, and the amino acid complex genuinely helps transplants while they’re re-establishing. Amino acids reduce the energy cost of protein synthesis for the plant, which matters most when it’s under stress — including the normal stress of going from pot to garden bed.
November
Warm soil and long days mean fast growth from everything in the ground. The main risk now is water stress, not nutrition, so stay on top of irrigation.
What to plant: Tomatoes, cucumbers, zucchini, lettuce, basil, beans, corn, carrots, beetroot, pumpkins.
Shallow-rooted crops like lettuce and radish can go from fine to wilted in a day of early summer heat. Mulch helps, but it’s not a substitute for consistent soil moisture. Keep the liquid feeding rotation going through November — FishBio is a good choice at this point. The organic nitrogen is gentle and steady rather than a sharp flush, and the sulphur content (12,000 mg/L) addresses a deficiency that standard fertilisers often miss. Sulphur is commonly low in NZ soils, particularly lighter sandy ones, and it plays a real part in protein synthesis and root function.
December
Still good planting conditions, particularly for fast crops to keep salads and summer staples going through the holidays.
What to plant: Beans, cucumbers, zucchini, beetroot, lettuce, spring onions, radish.
Succession sowing is worth keeping up through December. Sow every two to three weeks and you’ll avoid the inevitable glut of everything ripening at once. In areas with harsh afternoon sun, shade cloth over young transplants (30% is usually enough) makes a real difference while they’re getting their roots down
Feeding Your Garden Through the Season
Plants pull nutrients from soil continuously, and a garden that’s producing well — whether that’s vegetables, flowers, fruit trees, or ornamentals — is working through its reserves faster than most people account for.
The approach that works best across the garden is a granular base fertiliser applied at the start of the season, topped up with liquid feeding every two to four weeks through active growth. SteadyGro handles the base. Its coated urea technology releases nitrogen in line with soil temperature rather than all at once, so plants get a consistent supply rather than a spike and a drop-off. Apply it in August or September at 50–100 g per m² and you’re largely covered for base nutrition until mid-season. It suits vegetable beds, ornamental borders, fruit trees, and shrubs equally well.
For the liquid top-ups, rotating through SeaFeed, BioSpark, FishBio, and VegeBoost weekly covers different nutritional and biological needs across the season. SeaFeed addresses trace elements, particularly magnesium and boron, both of which are commonly deficient in NZ soils and rarely covered by standard granular fertilisers. BioSpark brings the biology: mycorrhizal fungi and beneficial microorganisms that improve how efficiently plants access what’s already in the soil. FishBio adds organic matter and a broad mineral profile, including meaningful sulphur, and feeds gently enough to suit ornamentals and perennials that don’t need a heavy push. VegeBoost is the nitrogen-forward option, with an amino acid complex that’s useful during heat, drought, or transplant stress.
Each can be applied as a soil drench or foliar spray. Foliar application gets nutrients into the plant faster, which is useful during visible stress or when you need a quick response. Soil drench feeds through the roots and supports the biology underneath. Alternating between the two depending on conditions and plant type makes the most of both.
SteadyGro as the foundation, four liquids rotating through the season: that’s how professional growers structure their programmes, and it works just as well across a mixed home garden as it does in a dedicated vegetable plot.