Seasonal Garden Maintenance Tips for Sydney’s Inner West & North Shore

The Four‑Season Maintenance Calendar 🌸 Spring (September – November): Wake‑Up Call Spring is when Sydney gardens accelerate quickly. The soil warms, daylight stretches and dormant plants burst into growth. This is the season to get ahead before everything becomes overgrown. Key tasks: Prune lightly – Remove any winter dieback and shape overgrown shrubs before the spring flush takes off. Hold off on heavy pruning of heat‑sensitive plants if an unexpected late heat snap arrives. Refresh mulch – A fresh layer of organic mulch (75–100 mm thick) suppresses weeds, retains moisture and keeps soil temperatures stable as the days warm up. Fine pine bark or lucerne are excellent choices for Sydney soils. Feed actively growing plants – Apply a balanced, slow‑release fertiliser to lawns, garden beds and containers. For lawns, choose a formula rich in nitrogen to encourage vigorous green growth, along with phosphorus for strong roots. Weed early – Removing weeds before they set seed saves a huge amount of effort later in the season. Hand‑pull annual weeds and spot‑treat persistent perennials. Aerate compacted soil – If the soil feels hard and water pools on the surface, use a garden fork or aerator to improve airflow and boost root growth. Plant spring vegetables and flowers – Broccoli, cauliflower, kale, silverbeet and lettuce can all go in now, along with annual flowers such as marigolds, petunias and snapdragons. ☀️ Summer (December – February): Managing Heat and Humidity Sydney summers are hot, humid and occasionally unpredictable, with average maximums around 27 °C and frequent afternoon storms. The challenge is keeping plants hydrated without wasting water, while also protecting them from heat stress and pests. Key tasks: Water deeply, less frequently – Aim for one thorough soaking session early in the morning (before 9 am) to minimise evaporation and allow foliage to dry before nightfall. Shallow daily watering encourages weak root systems. Apply and maintain mulch – A 50–80 mm layer of organic mulch keeps soil cool and dramatically reduces moisture loss. Just keep it a few centimetres away from plant stems to prevent rot. Protect vulnerable plants from heat – During a heatwave, sensitive plants can be shaded with 30 % shade cloth or moved into afternoon shade. Water pots and new plants thoroughly before and during extreme heat. Mow lawns higher – Raising the mower blade keeps grass roots cooler and helps the lawn retain moisture. Monitor for pests – Warm weather attracts aphids, caterpillars and lawn grubs. Check plants regularly and treat infestations early with eco‑friendly options. Control rapid growth – Prune back rampant summer growth to maintain shape and airflow, especially on hedges and fast‑growing climbers. 🍂 Autumn (March – May): Recovery and Preparation Autumn is arguably the most forgiving season for gardeners in Sydney. The soil is still warm from summer, the intense heat has eased, and the risk of scorching sun is gone. This is the ideal window for major soil work and planting cool‑season crops. Key tasks: Improve soil health – Top‑dress garden beds with compost or well‑aged manure. Let worms and autumn rain work the nutrients into the soil without heavy digging. Compost fallen leaves – Autumn leaf litter is a free source of carbon‑rich material for the compost bin. Shredding leaves speeds decomposition. Avoid composting diseased leaves. Apply a balanced fertiliser – A general‑purpose slow‑release fertiliser now will restore nutrients that summer crops have depleted, preparing plants for the cooler months. Reapply mulch – A fresh layer of mulch acts as a blanket, keeping soil warm and protecting roots from winter temperature swings. Plant cool‑season vegetables and perennials – This is prime time for planting brassicas (broccoli, cabbage, cauliflower), root vegetables (carrots, beetroot, parsnips) and leafy greens such as spinach and kale. Trim back spent summer plants – Remove finished vegetable vines and annuals to reduce disease carryover and tidy the garden. ⛄ Winter (June – August): Rest, Repair and Cool‑Season Crops Winter is the quietest season in the garden, but far from a time to do nothing. Days are mild (average maximums around 17 °C), nights can dip to 8 °C and frost is possible in elevated pockets of the North Shore. Key tasks: Protect from frost – If you live in an area prone to frost (such as St Ives, Turramurra or parts of Killara), cover sensitive plants with lightweight frost cloth overnight. Move potted specimens to sheltered spots near the house or under eaves. Reduce watering – Plants need much less water in winter. Over‑watering combined with cool, damp conditions can cause root rot. Check soil moisture before watering. Grow winter vegetables – This is the time for cool‑season champions: broccoli, cauliflower, cabbage, kale, spinach, silverbeet, carrots, beetroot, radishes and parsnips all thrive in Sydney’s mild winters. Leeks, spring onions and Asian greens are also excellent choices. Perform structural pruning – Many deciduous fruit trees and roses can be pruned hard while they are fully dormant. This is also the time to remove dead, diseased or crossing branches from evergreen trees. Mulch to insulate – Maintain a layer of organic mulch to buffer soil temperatures and reduce weed competition. Clean and organise tools – With slower garden growth, winter is a good opportunity to clean, sharpen and oil your hand tools and service mowers and trimmers. Soil Care That Makes the Difference Across both the Inner West and North Shore, soil quality is often the limiting factor in garden performance. Many properties have heavy clay that becomes waterlogged after rain and rock‑hard when dry. Others — especially nearer the coast — have sandy soils that cannot hold onto moisture or nutrients. The solution is consistent organic matter addition. Apply compost, aged manure or leaf mould at least twice a year (spring and autumn). This improves clay drainage, helps sand retain water and feeds the beneficial microorganisms that build long‑term soil health. For sandy soils, adding a wetting agent during summer can dramatically improve water penetration. For clay soils, avoid digging when wet, as this creates solid, brick‑like clods.