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Lemon tree winter in the UK

Updated: October 2026

The first sharp night is in the forecast and the lemon is still on the patio in its pot. A lemon tree winter in the UK is a move, not a fleece left on a plant in the border. Frost kills it. A heated living room can spoil it in a different way, by warmth and dry air. The sources do not agree on one safe degree, so this page keeps their numbers apart. The plants are on the [lemon tree comparison](/hub/trees-and-palms/lemon-tree). Which room you use is the [indoor lemon tree](/hub/trees-and-palms/lemon-tree/sub/lemon-tree-indoors) page. Summer watering is on [how to grow a lemon tree](/hub/trees-and-palms/lemon-tree/sub/lemon-tree-how-to-grow). We did not overwinter a trial plant.

The first sharp night is in the forecast and the lemon is still on the patio in its pot. A lemon tree winter in the UK is a move, not a fleece left on a plant in the border. Frost kills it.

Our top picks

Carbeth Plants Carbeth mini lemon tree

Best overall

Carbeth Plants Carbeth mini lemon tree
6.7/10about £26.99
View offer
Gardens4you Gardens4you lemon and orange

Rank 2

Gardens4you Gardens4you lemon and orange
7.4/10about £34.99
View offer
Carbeth Plants Carbeth gift-wrapped lemon

Alternative

Carbeth Plants Carbeth gift-wrapped lemon
6.0/10about £29.99
View offer
On this page
  1. 1.Why the border is the wrong winter home
  2. 2.5°C, 10°C, and frost
  3. 3.Leaves, light, and winter water
  4. 4.Coming back outside

Why the border is the wrong winter home

The RHS rates Citrus × limon as H2. That band is 1 to 5°C, and the plant will not survive being frozen. The hardiness key adds a narrow exception: frost-free inner-city areas and coastal extremities. Everywhere else, an H2 plant needs glasshouse conditions in winter. The same RHS advice says citrus will not reliably overwinter outdoors even in the mildest parts of the UK. A sheltered wall in Devon does not turn the border into a greenhouse. These amazon plants have not been tested to H2 or to any other figure. Only the plain Carbeth, B09R4RLNQH, states a winter place: a greenhouse or bright indoors, and protect it from frost. The gift plant and the lemon-and-orange pair say indoor and leave the room to you. Fleece can take the edge off a brief chill while you move the pot. It does not hold a plant in the soil through January. The lemon tree buying guide is where that limit belongs before you pay.

5°C, 10°C, and frost

Read the three RHS sentences as three jobs, not as a vote you can average. The grow guide says some lemons are fine as low as 5°C, and that you bring plants in when autumn nights dip. The problems page says winter nights for lemons should not fall below 10°C. H2 is the survival band of 1 to 5°C, with freezing as the point the plant does not get past. A night at 5°C can sit inside the grow-guide line and inside H2, and still sit under the problems-page minimum. That is not a licence to pick the number on your thermometer. Frost is the hard stop on every one of those pages. Below zero is not a grey area we will soften. A Guardian column in December 2021 said many citrus overwinter around 4°C, and that cold plus wet is what kills them. That is a column, not the RHS. Do not treat a blog's 7–12°C as if the RHS had written it. What you can decide without a fake single number is the place: frost-free, bright, and cooler than a living room with the heating on. A porch that stays above freezing and gets winter sun fits better than a spare room at 21°C. The listings do not state that these plants have been held at 5°C or at 10°C.
Carbeth Plants Carbeth mini lemon tree

Testsieger

Carbeth Plants Carbeth mini lemon tree
6.7/10about £26.99
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Leaves, light, and winter water

Leaves need light all winter. A dark shed or a cellar fights that RHS line. BBC Gardeners' World says a calamondin copes with dry heat better than a lemon. Centrally heated rooms are too warm and too dry on the RHS grow page. Leaf drop in January is common, and it is not automatically the end of the plant. The problems page ties it to draughts, to a room that is too cold or too warm, and often to too much water at the same time. Scratch the bark. Green underneath means a bare plant, not a dead one. Winter water is spare. Let the surface dry partly, then give tepid rainwater, and never leave the pot in the saucer. From October, the change is less water, not a bigger pot in the shortest days.

Coming back outside

You may have to wait until mid-June before the plant goes out again. Hardening off takes about two to three weeks. Start with a sheltered part of the day, extend it, and bring the pot in if a late frost is forecast. There is no week number that works from Kent to Caithness. If the lounge is the only indoor space, read the indoors page before you treat bring it in as solved. Do not repay a bare winter with a large pot and a heavy feed on the first warm Saturday.

Common questions

Is 5°C safe, or is 10°C the rule?
Both figures are on RHS pages, and they are not the same rule. The grow guide says some lemons are fine as low as 5°C. The problems page says nights should not fall below 10°C. H2 is 1 to 5°C and excludes freezing. Use frost-free and bright as the decision, and keep the numbers labelled. These listings have not been trialled to either figure.
When do I bring a lemon tree indoors?
Bring it in when autumn nights start to dip, before a frost, not after the compost has frozen. There is no national date. The place you move it into has to be bright. A shift into a dark garage saves it from ice and then starves it of light.
Why did my lemon tree drop its leaves in January?
Leaf drop often follows a draught, a room that is too cold or too warm, and compost that stayed wet. The RHS lists those together. If the stem is still green under a light scratch, keep the plant, water less, and give it light. A hot, dry lounge can cause the same drop as a cold porch.
Should I keep watering a lemon tree in winter?
Yes, but much less than in summer. Let the surface dry partly, then use tepid rainwater, and empty the saucer. The pot should not stand in water. Daily summer watering, carried through December, is how cold and wet meet. The growing page covers the summer check.
Does a mild coastal garden change the winter plan?
It can change how often you see a hard frost. The hardiness key already names coastal extremities as the exception to routine glasshouse cover. It does not say a coastal border is a safe permanent home. Keep the plant in a pot. A mild postcode is a reason to watch the forecast, not a reason to plant it out.

Related pages

Best lemon tree

Lemon tree

Lemon tree UK: what the amazon listing actually is

How to grow a lemon tree in the UK: water, feed, pot

Indoor lemon tree in the UK: window, porch or room

Sources

Public UK sources used for this comparison, last checked in October 2026.

  1. RHS, How to grow citrus (retrieved October 2026)
  2. RHS, Citrus problems (retrieved October 2026)
  3. RHS, Citrus × limon (retrieved October 2026)
  4. RHS, Meyer’s lemon (retrieved October 2026)
  5. RHS, Garey’s Eureka lemon (retrieved October 2026)
  6. GOV.UK, Issue plant passports (retrieved October 2026)
  7. GOV.UK, Plants that need a plant passport (retrieved October 2026)
  8. PDSA, Cats and essential oils (retrieved October 2026)