How to prune a citrus tree
When
Best: Mar–May (northern hemisphere — southern hemisphere: add six months)
After your last frost, before summer heat — near bloom or just after fruit set. Dead, damaged or diseased wood can come off in any month. The exception is frost-damaged wood: wait for spring regrowth to show the true limit of the injury.
Never
- ✗ Never cut a branch flush with the trunk — cut just outside the raised branch collar.
- ✗ Never seal a citrus cut with wound paint or tar (whitewash against sunburn is a different thing).
- ✗ Never cut freeze-damaged wood straight away — wait until spring regrowth shows the true limit of the damage.
- ✗ Never move citrus prunings, clippings or plants out of an HLB or citrus canker quarantine area.
- ✗ Never shear a potted citrus all over — hard-prune no more than one branch a year.
- ✗ Never skirt a young or container citrus — it strips fruiting canopy and exposes thin bark to sunburn.
The rules
Months in these rules are northern-hemisphere — in the southern hemisphere, shift them by six.
- • Prune after your last frost and before summer heat, aiming just before bloom or just after fruit set.
- • Do no shaping or size-reduction cuts from September through January — new growth won't harden before frost.
- • Rub or cut off any shoot coming from below the graft union as soon as it appears, right back to the base.
- • Remove water sprouts — unusually long, thick, upright shoots — at their base rather than heading them back.
- • But on a freeze-damaged tree, keep the strongest well-placed sprouts above the graft union and train them to rebuild the canopy.
- • Cut out dead, damaged or diseased wood in any month; in winter keep those cuts under 1/2 in (1.25 cm).
- • Thin crossing branches and any branch shading the lower limbs, until dappled sun reaches the ground at midday.
- • On an established in-ground tree, clear the foliage that rests on the soil every couple of years.
- • Take no more than about a quarter of the canopy in a year.
- • June-August cuts are light work only — thin and take deadwood, then whitewash every limb you newly expose.
- • Whitewash newly exposed limbs with 50:50 white latex paint and water — bare citrus bark sunburns.
- • Disinfect blades with 70% alcohol or 10% bleach between trees and after any cut into diseased wood.
Sourced from US university cooperative-extension services and the RHS, then adversarially fact-checked — every rule carries its source.
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