How to grow lemon
Overview
Lemon (Citrus x limon) is an evergreen small tree or large shrub, grown for its fragrant white blossoms, glossy dark green leaves, and tangy yellow fruit. It is both ornamental and productive, but needs full sun and protection from frost to thrive.
Varieties
- Eureka — Vigorous, nearly thornless, with few seeds and a long harvest season in temperate and subtropical zones.
- Meyer — A sweeter, less acidic lemon with thin skin; ideal for pots and cooler gardens.
- Lisbon — Hardy, productive, and more frost-tolerant; good for Mediterranean and inland areas.
- Lemonade — A hybrid with low acid, sweet flesh; popular in Australian backyards for fresh eating.
Soil Preparation
Lemon prefers slightly acidic soil (pH 5.5–6.5). Before planting, dig in well-rotted manure or compost and ensure good drainage. If soil is heavy, raise the bed or add gypsum.
Growing Guide
Plant lemon in full sun in well-drained loam, spacing 3–5 m apart. Dig a hole twice the width of the root ball, backfill with compost and native soil, and water deeply. Stake young trees for the first year. Avoid planting in heavy clay or waterlogged sites.
Care
Feed with a balanced citrus fertiliser in early spring and late summer. Prune after harvest to remove dead or crossing branches and maintain an open centre. Mulch with organic matter, keeping it clear of the trunk to prevent collar rot.
Companion Planting
Underplant with chives, marigolds, or nasturtiums to deter aphids. Avoid planting near eucalyptus or other citrus to reduce shared pest pressure. Keep a clear mulch-free zone around the trunk.
Common Pests & Risks
Citrus gall wasp causes swellings on stems; prune out and destroy in winter. Scale and leaf miner are controlled with horticultural oil or neem spray. Aphids can be hosed off or treated with soap spray.
Harvesting
Pick lemons when fully yellow and slightly soft to the touch. Twist gently or snip with secateurs to avoid damaging the branch. Fruit can be stored in a cool, dark place for up to 4 weeks.
In the Kitchen
Use lemon zest and juice in dressings, marinades, and desserts. Whole fruit can be preserved in salt or sugar. Store at room temperature for a week or refrigerate for longer.
Troubleshooting
Yellow leaves: often due to overwatering or nitrogen deficiency; check drainage and feed with citrus fertiliser. Brown leaf edges: caused by salt burn or dry winds; mulch and water deeply. Fruit drop: common after a dry spell or sudden heat; maintain steady moisture. Sooty mould: grows on honeydew from aphids or scale; treat the pest first. Cracking fruit: caused by uneven watering; keep soil consistently moist.