Cold hardiness & minimum temperature

Is Meyer lemon (Citrus limon 'Meyer')cold hardy? Hardiness zone & min temp

Also called Meyer lemon, Improved Meyer lemon.

More about meyer lemon

About Meyer lemon

Citrus limon 'Meyer' · also called Meyer lemon, Improved Meyer lemon · edible

Meyer lemon is a hybrid between a lemon and a mandarin orange, producing thin-skinned, sweeter-than-typical lemons nearly year-round. More cold-tolerant than most citrus, it is the premier container citrus for temperate climates. It self-pollinates freely and adapts well to indoor growing with a south-facing window and regular fertilising.

Cold limit: USDA 8-11 · RHS H1c (13–29°C optimal; tolerates brief periods to -4°C)

Watch for — Leaf drop / flower drop indoors: Triggered by moving the tree, temperature fluctuations, low light, or inconsistent watering. Avoid repositioning a tree that is flowering or in fruit; keep away from radiators and cold draughts; maintain 6+ hours of direct light.

What meyer lemon's hardiness rating actually means

Meyer lemon is a tender fruiting plant, not a hardy one. It crops outdoors only in roughly USDA 8-11; in cooler zones it is a container plant moved under cover for winter. Its RHS rating of H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 8-11 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about 5 °C (and never frost). Meyer lemon fruits in warmth and is set back or killed by frost.

Concretely, for meyer lemon as it gets too cold:

Below about 5 °C the foliage and any fruit are damaged; a hard frost can kill the whole plant.
A light frost typically scorches leaves and ruins the current crop even when the framework survives.
Roots in a container freeze far faster than roots in the ground, so potted specimens need earlier protection.

Can meyer lemon go outside or overwinter — and where?

It can stay outdoors year-round only in USDA 8-11; in a UK or cold-US climate it is a conservatory or move-it-indoors plant for winter.
Summer it outside in full sun for the best crop, then bring it into a cool, bright, frost-free room before the first frost.
A bright unheated (but frost-free) glasshouse or porch is the ideal overwintering spot — cool and dormant, never freezing.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when meyer lemon can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Frost protection for borderline meyer lemon

Meyer lemon is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Move containers into a frost-free glasshouse, porch or cool room before the first forecast frost.
For borderline-zone ground plants, wrap the trunk and fleece the canopy, and mulch the root zone heavily.
Keep it on the dry side over winter — cold plus wet roots is what actually kills tender fruit.

Meyer lemon hardiness — frequently asked questions

Is meyer lemon cold hardy?

Meyer lemon is a tender fruiting plant, not a hardy one. It crops outdoors only in roughly USDA 8-11; in cooler zones it is a container plant moved under cover for winter. Frost-tender. Grow meyer lemon in the ground only within USDA 8-11; everywhere colder it lives in a large pot that comes into a frost-free space each winter.

What is the minimum temperature meyer lemon can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Meyer lemon fruits in warmth and is set back or killed by frost.

What hardiness zone is meyer lemon?

Meyer lemon is rated USDA 8-11 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can meyer lemon survive winter outside?

It can stay outdoors year-round only in USDA 8-11; in a UK or cold-US climate it is a conservatory or move-it-indoors plant for winter. Summer it outside in full sun for the best crop, then bring it into a cool, bright, frost-free room before the first frost. A bright unheated (but frost-free) glasshouse or porch is the ideal overwintering spot — cool and dormant, never freezing.

How do I protect meyer lemon from frost?

Move containers into a frost-free glasshouse, porch or cool room before the first forecast frost. For borderline-zone ground plants, wrap the trunk and fleece the canopy, and mulch the root zone heavily. Keep it on the dry side over winter — cold plus wet roots is what actually kills tender fruit.