July technically reopens the sowing calendar in New Zealand's cool/mountain gardens: coriander and onion are the first two windows to open since the autumn crops closed out. But this is the coldest month in the coldest zone, and both windows stay open for weeks yet — so unless you're gardening under cover, July is less a sowing month than a harvest-and-prepare one, with the real planting rush still a month away.

The two windows that open — and why you can take your time

Coriander can be sown from July through November here, and onion from July through September. Both are genuinely cold-tolerant, which is why their windows open in the depth of winter. But "open" and "ideal" aren't the same thing in this zone: soil is at its coldest now, and seed sown into cold ground germinates slowly, if at all.

That matters less than it might, because neither window is short. Onion runs to September and coriander all the way to November, so there's no penalty for waiting a few weeks for the soil to lift a degree or two. The following is general cold-climate guidance rather than anything from our planting data: if you want to start now, raise seed in a cold frame, cloche or on a windowsill rather than sowing straight into the garden; if you'd rather not fuss, hold off until August or September, when the same windows are still open and germination is far more reliable. Either way, direct-sow onion once you do commit it to the bed — it's a long-season crop, roughly 160–200 days to a January–March harvest, and it resents being moved. Keep it out of freshly manured or high-nitrogen soil, which pushes leaf at the expense of the bulb.

If past coriander sowings have run straight to seed on you, Why Is My Coriander Bolting Immediately in NZ Cool/Mountain? covers why a winter start actually helps.

Coriander cultivars: Picante (Kings Seeds NZ), direct sown and suited to a wide spread of seasons; or NZH (Koanga Institute), whose notes suggest raising in trays and pricking out if you'd prefer to transplant. We don't have a specific onion cultivar in our catalogue yet — choose a NZ-suited long-day type from your usual supplier.

What's still cropping

The harvest list is short but real, and one crop is at its best right now:

  • Jerusalem artichoke harvests through to August, and the hard winter is a positive here — the cold sharpens the tubers' flavour and colour. Dig them a few at a time as you want them; they keep better in the ground than lifted.
  • Beetroot (to July) and carrot (to August) sit through frost without protection. Pull them as needed rather than leaving roots to sit in waterlogged cold soil.
  • Silverbeet keeps producing to July if you take the outer leaves and leave the crown. Growing Silverbeet Year-Round in NZ covers getting it through the coldest stretch.

July jobs that matter more than sowing

With planting optional this month, July's real value is preparation. None of this comes from planting-window data — it's general winter garden practice, worth checking against your own conditions:

  • Get beds ready for August. The reopening next month is a big one, so clear and compost the beds that will take the new sowings now, while there's time. Cold, wet soil is easily compacted — work it only when it's not saturated.
  • Protect bare soil. Ground left open to winter rain loses structure. Mulch it, or sow a green-manure crop, on any bed not currently holding a root or leaf crop.
  • Order seed now. August through November is the busiest sowing stretch of the year in this zone. Have seed and trays sorted before the rush rather than during it.
  • Check stored crops and tools. Cold, damp weeks are when stored produce starts to rot — use anything turning. And a quiet month is the time to clean and sharpen tools before they're needed daily.

What's coming next month

August is where this zone wakes up. The sowing list jumps from two crops to more than a dozen — broccoli, kale, onion, shallot and the winter brassicas all open, and tomato's window reopens for an early start under cover. After a near-dormant June and July, August is the first genuine sowing rush of the season, which is exactly why July's preparation pays off.

Know your zone? Explore the full NZ Cool/Mountain Planting Calendar for month-by-month sowing and harvest timing.