Planting this autumn? New plants still need watering
Autumn is the best time of year to plant in the UK — the soil is still warm, rain is more reliable, and roots get established long before summer returns. But 'the rain will do the watering' is the mistake that kills most autumn planting. New plants arrive with small root balls, and a dry, breezy fortnight in October is enough to set them back badly. Here's the routine that gets them through their first winter.
Why new plants can't wait for rain
Roots keep growing in UK soil until temperatures drop to around 4–5°C, which is usually well into November. A newly planted tree or shrub is trying to push roots out into surrounding soil right now — and if that root ball dries out even once, the fine new roots die back. Established plants can wait; new ones genuinely can't.
Soak at planting, then weekly in dry spells
Water thoroughly at planting time until the planting hole is saturated. After that, give each new tree or shrub 5–10 litres once a week whenever there's been no meaningful rain — a slow pour at the base, not a quick sprinkle over the leaves. A bucket with a few holes drilled in the base makes an easy trickle-waterer.
Don't trust autumn rain to reach the roots
Rain shadows are real: anything planted next to a wall, fence, or under tree canopies can stay bone dry through a month of showers. Pots under cover get nothing at all. Push a trowel 10 cm down beside the plant every week or two — if it comes out dry, water, whatever the weather has been doing.
When to finally stop
Once the ground is properly wet to spade depth and staying that way between checks — usually by mid-November — you can stop. The exceptions are evergreens and new hedging, which lose moisture all winter on bright, windy days. Check them monthly through dry, frosty spells and water if the soil beneath is dry.
The takeaway
Plant freely this autumn, but treat every new plant as your responsibility until November: a good soak at planting, 5–10 litres a week in dry spells, and a trowel check to see what the rain really reached.
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