If you're planning to add deciduous trees this year, autumn is a great planting window. The science is clear: trees planted into cool soil in autumn settle in beautifully and have months to spread their roots before spring growth begins.
What Happens in Autumn
Once leaves drop, the tree's top growth slows almost to a stop. But the soil stays warm well into late autumn. That gives the root system months to spread out without competing demands from the canopy. By the time spring arrives, the tree is drawing on settled, established roots.
Spring planting also works well, with the tree pushing leaves and roots at the same time. A little more watering through summer is part of the deal, and the trees thrive.
Five Trees That Benefit Most
The Japanese Maple settles beautifully when planted in cool soil. Autumn planting gets the roots running before the next growing season.
The Snow Pear gives its strongest spring flush when planted in autumn. Roots establish through winter and the tree flowers with full energy.
The Crepe Myrtle 'Natchez' planted in autumn is ready to flower its first summer.
The Ginkgo is slow to grow at the best of times. Autumn planting gives it the best possible start.
The Liquidambar is a large shade tree that benefits from autumn planting. The cool soil sets up a generous root system at scale.
How to Plant in Autumn
The same rules as any season, with a few autumn-specific notes:
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Dig a wide hole. Two to three times the rootball diameter.
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Go easy on fertiliser. Roots are settling, not pushing top growth.
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Mulch immediately. 75mm to retain warmth and moisture.
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Stake for one year. Autumn winds can rock a fresh planting.
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Water through dry spells. Even in winter, dry soil slows establishment.
FAQ
How late can I plant in autumn?
Down to mid-winter in most parts of Australia. Inland gardens just slow watering through hard frost periods.
What if I miss autumn?
Late winter, spring and summer all work. Summer planting goes brilliantly with morning and evening watering for the first two weeks.
Do evergreens want the same timing?
Less critical. Evergreens can be planted any time of year with the right watering routine.
Final Word
Autumn-planted deciduous trees enjoy a head start on establishment, vigour and first-year growth. If you can plan ahead, plant in autumn - and any other time of year still works with the right care.
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