Summer is almost here on the Coast, and with it comes the joy, and challenge, of gardening in the heat. This year, the warmer season brings not only higher temperatures, but also the unpredictable conditions of a La Niña pattern. A La Niña brings warm humid northeasterly winds, muggy nights, bursts of heavy rain, thunderstorms, tropical lows, flooding, unsettled skies and lush plant growth, which can make gardening more demanding than usual. A La Niña has been underway throughout 2025 and according to NIWA these conditions are likely to continue into early 2026.
For the home gardener these rapid shifts can cause stress on both plants and soil, creating an ideal environment for fungal diseases, root rot, and inconsistent growth. Whether you grow in the ground or in raised beds, it’s important to adjust your routine to suit the season. Start by focusing on heat and humidity-tolerant plants. Mediterranean herbs like rosemary, thyme, and oregano thrive in dry conditions, while natives such as flaxes, hebes, and manuka are well-suited to local soils and climate.
Mulching remains one of the most effective ways to manage moisture and temperature fluctuations. Five to ten centimetre layer of mulch, such as pea straw, bark, or compost helps retain water during hot spells and protects roots from overheating. However, in damp conditions, take care not to pile mulch too closely around plant stems to prevent collar rot.
Watering as usual needs to be done early in the morning or later in the evening when the sun is low. I prefer morning as evening watering can encourage slugs and snails who love the humid conditions. This reduces evaporation and gives plants time to absorb moisture before the heat of the day.. Watch out for signs of disease, yellowing leaves, powdery mildew, and soggy stems are common in humid summers. Proper spacing between plants helps airflow and keeps mildew at bay.
Good drainage is also essential, especially in the humid bursts of La Niña. Raised garden beds and pots not only reduce strain on knees and backs but also allow for better control of soil conditions.
Despite the unpredictable weather, summer remains one of the most rewarding times to grow. Tomatoes, zucchinis, cucumber, capsicums, melons and basil all love the heat and, with a little attention, will thrive through the season.
With a bit of planning and care, gardens on the s Coast can stay healthy, productive, and beautiful, even during La Niña!
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