01/10/2025
NICKI'S GUIDE FOR OCTOBER IN THE GARDEN
October is go-time in the garden, but don’t rush heat-loving crops. Soil temperature - more than sunshine - is the real decider of success. Tomatoes, capsicums, chillies, pumpkins, melons, cucumbers, zucchini, eggplant, basil, beans and corn all need warmth at the roots. As a guide, most crops won’t thrive until soil temps reach 16°C, while tomatoes and chillies prefer 18–20°C. Don’t be fooled by sunny days - if nights are still cold, pot seedlings into larger containers with a rich compost/ potting mix and keep them sheltered indoors.
Crops to plant now: leafy greens (lettuce, spinach, bok choy, kale, celery, and herbs like fennel, rocket, coriander, mizuna, parsley and dill). Sow a little every few weeks for a steady supply. Legumes (peas and beans) don’t like their roots disturbed, so start them in cardboard tubes, such as toilet rolls, that can be planted straight out, tube and all.
Root crops: direct sow potatoes, carrots, parsnips, beetroot, radish and onions. Keep bird protection handy - cloches or netting work well. If you haven’t already, start sprouting your kumara, or look out for established tipu at farmers’ markets or garden centres. Here in the Waikato I plant mine in early November, once frost risk has passed, but planting in Northland can begin now.
Seed sowing - As a general rule, plant the seeds twice as deep as the width of the seed. A handy way to control the amount of mix you place over the seed is to 'dust' the seed mix like icing sugar on a cake through a plant pot with large holes. Space your seeds so that they won't get overcrowded in the tray as they grow.
Seedlings need a gentle introduction to the outdoors. Pop trays outside for 3–4 days before planting. After transplanting, give them a liquid seaweed feed to reduce shock and support strong root growth.
Spring winds are hard on plants and soil. Layers of protection works best: larger shelter trees on the boundary, evergreen shrubs and perennials close to the garden (citrus, feijoa, globe artichoke, Chilean guava, rosemary and pineapple sage are all excellent), plus large pots at the ends of raised beds for extra shelter.
Tall crops such as tomatoes, beans and sweet peas need solid supports - trellises, teepees or reinforcing mesh between posts. Stakes alone often aren’t enough. My tomato trellis has a cross bar across the top, with plants winding up taut strings from a loose noose (lol) at their base. Kings Seeds also recommend growing cucumbers on trellises, to improve airflow, reduce disease and produce straighter fruit. I usually grow mine along the ground over a thick layer of pea straw, but am going to go up this year - that way I can fit more in!
Flowers to sow this month: alyssum, borage, cosmos, sweet pea, poppy, nasturtium, echinacea, snapdragon, zinnia (my favourite companion plant - and the monarchs’ too), marigold, calendula, cornflower, salvia and sunflowers (in warmer areas). Plant dahlia tubers now as well.
In the orchard, plant citrus, passionfruit, tamarillo and avocado once frost danger has passed. Stake young trees, feed, and mulch well. If your trees had leaf curl last year, apply a copper spray as soon as fruit buds start to swell, then again two weeks later - ideally early in the morning before bees are active. Regular foliar feeds with seaweed or worm juice will keep trees strong and resilient. Plant a living mulch of herbs, garlic, chives, comfrey, borage and calendula at the base of fruit trees for health, protection and to attract pollinators and beneficial insects.
Preparing beds: loosen and aerate soil with a fork (don’t turn it over - come to a workshop and I’ll explain why!), add compost plus a broad fertiliser such as Ocean Organics NZ Soil+, then mulch with pea straw, untreated sawdust or wool. Wool is excellent for retaining moisture, suppressing weeds and deterring slugs.
Next Edible Gardening Workshop: 18th October. We’ll cover soil health, seed sowing, succession planting, composting and worm farming. Suitable for both beginners and seasoned gardeners. Message Vital Harvest to join.
Happy gardening!
Nicki – Vital Harvest