Autumn gardening tips

Up your Autumn gardening game with these seasonal gardening tips that will have your yard coming up roses.

Summer has been and gone, and we say hello to autumn, when the leaves begin to develop those signature tints. The start of the new season might have you wondering – what jobs should I be looking to tick off at home?

Gardening is a great place to start. Here’s what our friends from the Botanic Gardens of South Australia recommend for a season some say is the most important of the year for your garden:

Plant, plant, plant

Autumn’s the ideal time of year to plant – particularly trees, shrubs and perennials – because air temperatures have cooled, soil temperatures are still warm and you’ve hopefully had some rainfall to increase soil moisture. First consider the state of your soil because this is the time to undertake any soil improvements, such as mixing in soil conditioners, prior to planting.

When the soil’s warm and moist, new plantings will establish good root growth before slowing down in winter. You’ll see benefits again in early spring, when the plant you planted in autumn – which has had time to establish – puts on wonderful new growth ahead of next summer’s heat.

Autumn’s also a good time to begin transplanting shrubs or trees, and to make new plants from cuttings. Take 10-centimetre cuttings from hardwood herbs such as rosemary and bay, or natives such as banksias, grevillea and coastal rosemary. Remove the lower leaves, dip cuttings into hormone powder and pot in small containers of premium potting mix. Keep the cuttings just moist, and shelter them from strong wind and sun.

Kitchen garden planning

Start forward planning and planting now for your winter crops to ensure a bumper harvest. Try to get all brassicas – such as cabbage, kale, Asian greens, broccoli and cauliflower – in by the end of March.

Take a leaf out of the Botanic Gardens’ winter crop for the Little Sprouts Kitchen Garden, which includes beetroot, broad bean, broccoli, coriander, cabbage, celery, fennel, kohlrabi, lettuce, parsnip, snow and sugar snaps peas, silverbeet, swede, spring onion and turnip.

Fertiliser

Choose a well-balanced fertiliser – one that has equal ratios of nitrogen, phosphorus and potassium, and contains calcium. This will encourage plant cells to thicken, making your plants more resilient to fungus and disease during the cold and wet of winter.

Lawn care

Autumn’s ideal to help your lawn recover from the hot and dry summer, and to prepare it for the wetter and colder months. It’s a good time to fertilise your lawn, but ideally you want a lower nitrogen content fertiliser than what you use in spring and summer.

A more even balanced nitrogen, phosphorus and potassium fertiliser will help repair damaged areas by promoting new growth, but will also importantly promote new root growth before soil temperatures drop, giving your lawn a head-start for next spring.

Remove fallen leaves from your lawn regularly as these will deprive the lawn of light, causing it to die off and brown patches.

On the rose

For rose aficionados, autumn’s the time to fertilise to ensure your roses have a good supply for that final specky autumn flush.

Worms

Earthworms are a sign your soil is fertile. When you add organic matter such as leaves and cow manure to your garden soil, you'll attract earthworms, so there's no need to add more to your garden.

The worms you’ve attracted with organic matter will add nutrients from their castings, and make tunnels. Check for borer damage on all deciduous trees, paying attention to the trunk at soil level. It‘s easier to check when trees are dormant and bare.

Leaf matters

This time of year produces a lot of leaf matter and you can use this to start a compost of leaves – such as oak in particular. Traditionally ‘oak leaf mould’ was an integral part of potting mixes, but more recently it has been replaced by peat-moss – coir or natural – and pulverised composted pine bark.

Other handy hints

Good garden hygiene at this time is a great idea. Take care around the base of shrubs and trees to limit the build-up of mulch and other garden matter around the stem or trunk region, particularly in high rainfall areas such as the Adelaide Hills. This helps prevent collar rot and other fungal attack.

Pruning of some species of tree, for shape more than anything, is also a good idea. Some trees, maples in particular, will bleed if you leave it too late. Pruning too early or too late can also open the tree to fungal attack through the wound.

This season there will be a lot more downy and powdery mildews, particularly in the Adelaide Hills. The soft option is spraying it with milk, but there are also preparatory fungicides available too – just make sure to read the instructions well and check their impact on the environment. Some can contain harsh chemicals which can be damaging to sensitive ecosystems.

Trim hedges before the onset of winter to keep them compact and bushy from ground level.

Why not develop your gardening and horticulture skills by attending a Botanic Gardens Masterclass this year?

This story was originally published on the Botanic Gardens of South Australia blog. To have the latest news from the Gardens delivered to your inbox, subscribe to their monthly e-newsletter.

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