Lemon

Sun

Full sun, preferably at least 6-8 hours daily; shelter from cold and drying winds.

Water

Water deeply, then allow the surface soil to dry slightly before watering again. Containers need frequent checks in warm weather, but roots must never sit in water.

Soil

Free-draining loam, ideally slightly acidic, around pH 5.5-6.5. For containers, use a free-draining citrus potting mix and a pot with open drainage holes.

Height

10-20 ft (3-6 m); trees on dwarfing rootstocks and container-grown trees usually remain smaller.

Spread

10-15 ft (3-4.6 m)

Flowers

White flowers, often pink-purple on the outside of the buds; mainly spring, with repeat flowering in warm conditions.

Foliage

Evergreen. Glossy, oval, dark green leaves with a lemon scent when crushed; branches often carry thorns.

Growth

Moderate in warm conditions; slow in cool climates or restricted containers.

Care needed

Medium

• Plant at the original root-ball depth, keeping the graft union above soil level.
• Water the root zone thoroughly; empty container saucers and reduce watering during cool winter conditions.
• Apply citrus fertiliser with trace elements during active growth, following the label; avoid heavy feeding in winter.
• Spread 2-3 in (5-8 cm) of organic mulch over the root zone, leaving a clear gap around the trunk.
• Move pots into bright, frost-free shelter before frost; temporary covers help garden trees through brief cold spells but not prolonged freezes.
• Move overwintered plants outdoors gradually after frost risk has passed to prevent leaf scorch.

Pruning. Prune lightly in spring once frost risk has passed, removing dead, damaged and crossing shoots and any growth below the graft. Avoid hard pruning, which reduces fruiting and exposes bark to sunburn.

Spring

Resume feeding as growth starts and inspect new shoots for aphids and scale insects.

Spring

Prune lightly after frost risk has passed; repot crowded container trees if needed.

Late spring

Gradually acclimatise overwintered pots to outdoor sun and refresh mulch around garden trees.

Summer

Check container moisture frequently and water deeply during hot, dry weather.

Autumn

Prepare frost protection and move container trees under cover before freezing nights.

Winter

Keep sheltered trees bright and cool, water sparingly without drying the root ball completely, and check for mites and scale.

Year-round

Harvest full-sized, fully coloured fruit as it ripens; timing varies with variety and climate.

• Grow in a large pot on a sunny terrace, where flowers and fruit can be enjoyed close to seating.
• Use as a small evergreen focal tree in a sheltered courtyard or edible garden.
• Train against a warm, sunny wall in suitable climates to save space and provide shelter.
• Combine with Mediterranean herbs planted beyond the regularly watered root zone for contrasting foliage and scent.

Garden styles it suits: Mediterranean, Modern Mediterranean, Modern courtyard, Potager (kitchen garden), Edible landscape and Sensory garden.

Plant it with: Thyme, Rosemary, Lavender, Sweet alyssum and Nasturtium.

Wildlife: Fragrant flowers provide nectar and pollen for bees and other insects. Lemons are generally self-fertile, although insect visits can improve fruit set; avoid spraying open flowers.

• Scale insects and aphids cause sticky honeydew and sooty mould: inspect stems and leaf undersides, remove small infestations by hand, and use a labelled horticultural oil or insecticidal soap where necessary.
• Spider mites cause pale stippling and fine webbing, especially indoors: rinse leaf undersides, reduce hot, dry conditions and use a labelled mite treatment if needed.
• Root and collar rot develop in wet soil: improve drainage, keep mulch away from the trunk and never leave pots standing in water.
• Yellow leaves with green veins can indicate nutrient unavailability, especially in alkaline soil: check drainage and soil pH before applying an appropriate citrus feed or chelated iron.

Toxic to cats, dogs and horses: peel, leaves and other oil-rich parts contain essential oils and compounds that can cause digestive upset and sometimes skin irritation. Small exposures are usually less serious than substantial ingestion or exposure to concentrated citrus oil. Ripe juice and flesh are edible for people and are not normally poisonous, though their acidity can irritate the mouth and stomach; concentrated oils can irritate skin.

• Meyer lemon (Citrus × meyeri)

  Usually bears rounder, thinner-skinned, deeper yellow to orange-yellow fruit with less acidic juice than a typical lemon.

• Citron (Citrus medica)

  Fruit generally has a much thicker, often rough rind and relatively little juicy flesh.

• Persian lime (Citrus × latifolia)

  Fruit is usually smaller and rounder, with a distinct lime scent; it is commonly picked green but turns yellow when fully ripe, so colour alone is unreliable.

The word lemon reached English through French limon, ultimately from Arabic and Persian names for citrus fruit.

Propagation. Usually budded or grafted onto selected citrus rootstocks to control size and improve adaptation to soil conditions. Cuttings are possible, but seed-grown trees may differ from the parent and take many years to fruit. Buy certified disease-free plants and observe local citrus movement restrictions.

Accepted botanical name

Citrus limon

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.