June is the quietest sowing month of the year in New Zealand's cool/mountain gardens — but not a closed one. Unlike warmer temperate gardens, where nothing at all goes in this month, cool/mountain gardeners still have garlic on the table: its window here runs May through June, so June is the last call to get cloves in. Beyond that single crop, June is about the harvests still standing in cold ground and the unglamorous winter jobs that decide how well spring goes.

What you can still sow: garlic, and only garlic

Garlic is the one crop with a June sowing window in this zone. It's the tail end — the window closes at the end of the month — so if you haven't planted yet, don't leave it any later. Set individual cloves 5cm deep and 15cm apart in a sunny, free-draining bed worked over with compost, and expect roughly seven months to a December–January harvest.

June planting suits the cool/mountain zone specifically: garlic needs a long, cold spell to split each clove into a full bulb, and the coldest gardens can plant latest and still get it. The precise May–June window is our own recommendation for this zone rather than a figure from a seed packet — most NZ suppliers quote a broad April–May without splitting it by climate — so treat late June as the outer edge and adjust to your own frost pattern. When to Plant Garlic in Canterbury NZ walks through the timing for a cold South Island garden in more detail, and Rust and White Rot in NZ Garlic covers the two diseases worth setting the bed up against from the start.

What's still growing and ready to pick

Nothing new joins the beds, but several crops keep cropping through the cold:

  • Silverbeet (harvest to July) and beetroot and carrot (both harvesting well into winter) sit out frost without protection. Keep taking silverbeet's outer leaves and pulling roots as you need them. Growing Silverbeet Year-Round in NZ covers keeping it productive through the cold months.
  • Pak choy and radish both reach the end of their harvest windows this month — pick or pull the last of them rather than leaving them to go woody or bolt in cold soil.
  • Pumpkin also closes its harvest window in June. Bring in any fruit still outside, and cure it in a dry, airy spot before storing rather than putting it straight into the cupboard.
  • Jerusalem artichoke is the one crop that the cold improves — its harvest runs to August, and the tubers hold better left in the ground than lifted. Dig a few at a time as you want them.

June garden jobs that set up spring

With only garlic to plant, June's real work is preparation. None of this is drawn from planting-window data — it's general cold-season garden practice, worth cross-checking against your own site:

  • Mulch the new garlic. A layer of straw or wood-chip mulch over just-planted cloves steadies soil temperature and keeps weeds down while the garlic roots into cold ground. After a hard frost, check for any cloves heaved up by the freeze and firm them back in.
  • Protect the soil, not just the plants. Established roots and greens take frost in their stride, but bare beds don't benefit from sitting open to winter rain. A cover of mulch or a sown green-manure crop protects soil structure and feeds it for spring — decide which beds get which now.
  • Do the maintenance the growing season never leaves time for. Clean and sharpen tools, wash out seed trays, and turn the compost. Check any stored crops from autumn and use up anything starting to turn.
  • Order seed for the spring rush. The calendar reopens next month, and the busiest sowing weeks aren't far behind. Sorting seed and bed space in June beats scrambling once the windows open.

What's coming next month

July ends the sowing lull: coriander and onion both open their windows, the first new sowings since the autumn crops closed out. Everything harvestable now — beetroot, carrot, silverbeet and the rest — carries on regardless. June's job is to have the beds, the seed and the tools ready so you can move the moment July arrives.

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