01/09/2026
NICKI’S GUIDE FOR SEPTEMBER IN THE GARDEN
There’s something pretty special about spring in the garden. After winter’s slower pace, everything suddenly wakes up - fresh growth and blossoms everywhere. Longer days, warmer temperatures and moist soil make this one of the best times to plant, but don’t put the frost protection away just yet!
Now is the time to plan what you’d like to eat over summer. If starting from seed, sow indoors or in a glasshouse, around twice the seed’s width in depth, and keep moist while germinating.
Spring is prime time for leafy greens - lettuce, silverbeet, bok choy, spinach, celery, cress, sorrel, fennel, rocket, coriander, mizuna, parsley, dill and chives. Sow every 2–3 weeks for continuous harvests.
Brassicas - broccoli, cauliflower, kale and cabbage - should be protected with fine insect mesh from day one to prevent cabbage white butterflies laying eggs.
Root crops including spring onions, beetroot, radish, daikon, parsnips and carrots can be sown directly. Keep carrot seed consistently moist for the roughly two weeks it takes to germinate. Protect from birds and keep up the slug and snail patrol.
Don’t rush summer crops such as tomatoes, chillies, capsicums, cucumbers, pumpkins and zucchini. Soil temperature matters more than a sunny afternoon. Tomatoes need soil temps of at least 18°C and night temps around 13°C or warmer. If conditions are borderline, use a cut-off soda bottle as a mini glasshouse over individual seedlings.
Harden off all seedlings for 4–7 days before planting outdoors, including nursery-bought plants. An Ocean Organics NZ seaw**d feed at planting time can help reduce transplant shock and encourage strong root growth.
Don’t make the garden all about vegetables! Flowers provide colour, habitat and food for pollinators and beneficial insects. Plant sweet peas, calendula, cornflowers, cosmos, poppies, nasturtiums, marigolds, sunflowers, echinacea, snapdragons and zinnias.
Plant your seed potatoes now, get kumara slips underway for planting out in November and when around half the leaves of your garlic have browned, dig up a bulb to check whether the cloves are ready to harvest.
Plant citrus, passionfruit, tamarillos and avocados. Stake young trees securely and keep them well watered while establishing.
Spring winds are an issue, so shelter is an important part of your garden design. Taller plants on the border but also low-growing shrubs in pots can help protect vulnerable areas. Make sure climbing structures are sturdy. Reinforcing mesh strung between two stakes is excellent for tomatoes and other tall crops, while a simple bamboo teepee works well for beans.
As temperatures and humidity increase, watch for aphids, mealybugs and stink bugs. Check new growth and leaf undersides regularly. Squish pests on sight or blast soft-bodied insects off with water; for heavier infestations, regular applications of neem oil can help.
Spring is all about getting ahead - plant little and often, protect young crops, liquid feed, and make plenty of room for flowers. The work you put in now will reward you with a garden full of food, colour and life over the summer months ahead.
Happy growing!
Nicki - Vital Harvest