01/08/2026
NICKI'S GUIDE FOR AUGUST IN THE GARDEN
Spring is just around the corner! While it may still feel like the depths of winter, August is all about preparing for the busy growing season ahead. Stock up on seeds, refresh garden beds, feed your soil, and make any final layout changes before the sowing frenzy begins next month.
What to Sow
If you're in the far north, or have a heat pad and a sunny windowsill, you can get an early start on tomatoes, chillies and capsicums. These heat-lovers, as well as aubergine, cucumbers and zucchini, most definitely need consistently warm soil conditions for successful germination.
Direct sow broad beans and radishes.
Sow peas into cardboard rolls and plant out once established to protect from birds and slugs.
Tray sow brassicas (broccoli, cabbage, cauliflower, kohlrabi, kale), celery, lettuces, spinach, beetroot, bok choy, onions (spring, red and brown).
Carrots can be sown in pots if kept somewhere warm and sheltered.
What to Plant
Brassicas, celery, onions, silverbeet, spinach, parsley, mizuna, tatsoi, rosemary, sage and thyme. Lettuces, beetroot, bok choy, rocket and coriander can be planted out in milder regions. Elsewhere grow them in the greenhouse. Asparagus crowns, rhubarb and yacon.
Winter is the perfect time to plant strawberries, they love a chill - plant into well-fed soils with a layer of mulch.
Add flowers such as alyssum, calendula, borage, cornflowers, cosmos, poppies, snapdragons, hollyhocks and sweet peas to attract beneficial insects.
Feed Your Soil
Dig in established cover crops, add compost, aged manure, vermicast or seaw**d fertiliser, such as Ocean Organics NZ Soil+, then finish with a generous layer of mulch to nourish and protect the soil. Plant summer cover crops of lupins and phacelia if you don’t need the beds for a while.
Pruning
Finish pruning apples and pears, tidy citrus, and prune roses, feijoas, passionfruit, hydrangeas and grapes. Leave stone fruit until summer to reduce the risk of silverleaf disease.
If leaf curl or black spot were problems last season, apply a copper spray as buds begin to swell and repeat two weeks later. Mulch around fruit trees and consider underplanting with comfrey, calendula, chives or herbs.
Potatoes & Kūmara
Start chitting potatoes now if you want a Christmas harvest, and get your kūmara tipu (sprouts) underway by placing kūmara in a moist sandbox or standing upright in half a glass of water.
Garden Jobs
• Liquid feed garlic twice a month to boost bulb development.
• Divide established perennials to prevent overcrowding and rejuvenate plants (leave frost-tender plants until spring).
• Clean pots, seed trays and the greenhouse with warm soapy water to remove fungal spores and insects.
• Sharpen and oil your tools.
• Hunt slugs while it’s quiet and save countless seedlings later!
September is when the garden really bursts into life, so enjoy the quieter pace while it lasts.
Happy gardening!
Nicki - Vital Harvest