Meyer Lemon
Citrus × meyeri · the Improved Meyer
It is a long-cultivated Chinese dooryard citrus, brought west from a Beijing doorstep in 1908. Not a true lemon at all but a hybrid of a lemon and a mandarin, it is one of the very few houseplants that will actually flower and fruit on a windowsill.
Family
Rutaceae
Origin
China
In the wild
A garden hybrid, no wild form
Indoors
0.6–1.2 m
Growth
Moderate
With pets
Toxic
Where it's from
China
A hybrid, not a species
Believed to be a cross of a lemon or citron and a mandarin. It has no real wild population.
Found near Beijing
The USDA plant explorer Frank Meyer shipped it from China in 1908 as accession S.P.I. #23028.
Outdoors: zones 9–11
The most cold-tolerant lemon, but still frost-sensitive. A container plant everywhere colder.
It fruits on a windowsill
Given a bright enough spot, the Meyer lemon flowers and sets fruit indoors. The waxy white blossom is intensely fragrant, and it can carry flowers and fruit at the same time. The fruit itself is rounder, thinner-skinned, juicier and sweeter than a common lemon, with an orange note from its mandarin parent.
Fragrant white flowers
Purple-tinged buds open to waxy, scented blossom that can appear nearly year-round in warmth.
Sweeter, thinner fruit
Less acidic than a standard lemon, prized for cooking, baking and drinks.
Hand-pollinate indoors
With no insects inside, moving a soft brush between flowers helps it set fruit.
How to keep it
LightFull sun
The brightest south window or a grow light indoors. Light is what drives flowering and fruit.
WaterSteady, let top dry
Regular and consistent, letting the top of the mix dry slightly between drinks. Avoid soggy soil. Less in winter.
HumidityModerate to highPrefers some humidity. Misting in active growth helps under glass.
TemperatureWarm, frost-shyLikes warm days and mild nights. It tolerates brief dips near freezing but is not reliably frost-hardy.
SoilWell-drained citrus mixSandy and free-draining, roughly neutral. In pots a loam-based citrus compost with added grit.
FeedingCitrus feed, regularlyCitrus are heavy feeders. Use a citrus-formulated fertilizer through the year, with extra nitrogen and micronutrients.
DifficultyModerateEasy to keep, harder to fruit indoors. It needs light, steady water and feeding to crop well.
With petsToxicEssential oils and psoralens. Vomiting, diarrhea, depression and skin irritation. The peel and oils are the real risk.
PropagationCuttings, not seedSemi-ripe cuttings in summer, or layering. Seedlings do not come true to type, so the named clone is grown vegetatively.
RepottingEvery 2–3 yearsWhen rootbound, refreshing the mix.
What the data says
What it costs
A mass-produced nursery citrus, though pricier than a foliage houseplant because it is grafted and certified.
$25–60
Larger fruiting specimens and variegated citrus run $80–150 and up. No collector bubble here.
IUCN · Not evaluated
In the wild
The twist here is not extinction. It is quarantine.
The Meyer lemon has no real wild population. By the 1940s most of California's Meyer lemons were found to be silent carriers of Citrus tristeza virus, which had devastated citrus worldwide. Infected trees were destroyed, and a clean selection was certified and released in 1975 as 'Improved Meyer'. The plant on your windowsill is a deliberately sanitized clone of a tree that was nearly eradicated to protect everyone else's citrus.
When it sulks
Leaf drop, no fruitToo little light, drafts, or inconsistent watering. Give it the brightest spot and steady moisture.
Yellowing leavesOverwatering and poor drainage, or a nutrient shortage. Citrus need iron, magnesium and nitrogen.
Flowers but no fruit setIndoor plants often need hand-pollination with a soft brush.
Pests under glassSpider mites, scale, aphids, mealybugs, whiteflies and thrips. Sooty mould follows sap-suckers.
Leaf or fruit spottingCitrus diseases such as anthracnose, scab, greasy spot and canker.
Varieties & company
The varieties
Improved MeyerVariegated Pink
Pairs with · keep apart from
CalamondinKumquatRosemaryCalatheaFernsPeace Lily
A new plant, every week.
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