A lemon tree is a piece of the Mediterranean in a pot: glossy evergreen leaves, fragrant white flowers and fruit that ripens over months, often with flowers and fruit on the tree at the same time. In warm climates it grows in the ground; in cold ones it is the classic conservatory or patio-pot tree.
Use the fruit for cooking, drinks and preserving, the zest for baking, and the leaves for flavouring — a single tree supplies a household. The flowers alone are worth growing it for: their scent fills a room. This crop is in the Rutaceae family, needs full sun, and takes 1095–1825 days to reach maturity, so it pays to know what it wants before you sow. This guide covers it all: starting seeds, transplanting, soil and feeding, watering, sunlight, pests, companion plants, harvesting and the problems most likely to catch you out. Feed with a citrus fertiliser through spring and summer, water with rainwater if you can, and keep the pot off cold ground in winter by standing it on pot feet.
Lemons at a glance
| Growing factor | What lemons need |
|---|---|
| Sun | full sun |
| Soil pH | 5.5–6.5 |
| Days to germination | 14–28 |
| Days to maturity | 1095–1825 |
| Spacing | 120–180 inches |
| Water needs | moderate |
| Cold tolerance | tender |
| Family | Rutaceae |
Starting seeds
Lemons can be started indoors or sown direct. Indoors, sow in trays or cells and expect germination in 14–28 days; direct-sown seed goes into prepared soil once conditions are right. Starting indoors buys a few weeks of season, while direct sowing is simpler and avoids transplant shock.
Short-season gardens in Zones 3–5 gain the most from starting indoors, while Zones 8–10 can usually direct-sow with confidence. Our seed-starting calculator works out indoor sowing dates from your frost dates.
Lemons are grown from grafted nursery trees, not from seed. Seed takes 14–28 days to germinate and the seedling will not match the parent, and will take 1,095–1,825 days to mature — buy a named tree instead.
Transplanting and planting out
Most gardeners plant a grafted nursery tree rather than growing from seed. Plant bare-root trees while dormant, or container-grown trees at any time the ground is workable. Dig a hole twice as wide as the root ball, set the graft union a few inches above soil level, backfill, water in well, and stake the tree for its first year or two.
Space plants 120–180 inches apart — crowding is one of the commonest causes of small harvests. Our plant-spacing calculator works out how many plants fit your bed. Harden seedlings off for a week before planting out, and plant on a cloudy day or in the evening so they do not wilt in their first hours outdoors.
Soil and feeding
Fruit trees want deep, well-drained soil and a spot that does not sit wet in winter. Dig a generous hole and mix in compost, but do not feed heavily in the first year. A mulch ring keeps the soil moist and suppresses grass.
Aim for a soil pH of 5.5–6.5 — a simple soil test will tell you where you stand. Feed lightly and steadily rather than in one heavy dose: too much fast nitrogen late in the season pushes leafy growth at the expense of the part you eat. Our fertiliser calculator works out amounts for your bed size, and the raised-bed soil calculator tells you how much mix a new bed needs.
Watering
Water needs are moderate: keep the soil evenly moist, watering deeply when the top inch or two dries out. Deep, infrequent watering builds deeper roots than a daily sprinkle.
Water young trees deeply and regularly for the first two seasons while they establish — a bucket poured slowly at the base is better than a sprinkler. Once established, most fruit trees cope with dry spells, but they still crop better with steady water while the fruit is swelling.
Water at the base of the plant, in the morning, so the leaves dry quickly. Our watering calculator gives a starting point for your bed size, and the watering schedule generator can build a routine around it.
Sunlight and temperature
Fruit trees need full sun for sweet fruit — at least six hours of direct sun a day. Shelter from cold winds matters too, especially at blossom time, when a frost can wipe out a year's crop overnight.
This crop is rated tender for cold tolerance, so plan your season around that: hardy crops can be sown and harvested around frosts, while tender crops need warm soil and frost-free nights. Our sunlight calculator can check whether your spot gets enough sun, and the hardiness-zone finder will confirm your zone.
Pests and diseases
Lemons are not especially pest-prone when healthy and well placed, but a few pests turn up regularly. The ones listed for this crop in the growing data are aphids, slugs, cutworms.
- Aphids — Small sap-sucking insects that cluster on soft new shoots, weakening growth. A strong jet of water dislodges them, and ladybirds usually keep them in check.
- Slugs — Slugs feed at night, chewing holes in leaves and fruit — especially young seedlings and berries at ground level. Hand-pick them after dark and keep the ground clear of hiding places.
- Cutworms — Caterpillars that feed at night and cut young stems off at soil level. A cardboard collar around the stem at planting time stops them.
Inspect plants weekly, especially the undersides of leaves, and act early. If you need help identifying what you are seeing, our pest-identifier helper and plant-disease checker walk through the symptoms.
Companion plants
Companion planting puts together plants that help each other — sharing space well, attracting pollinators, or confusing pests. The companions listed for lemons in the growing data are a good starting point.
Good companions for lemons include:
- Borage
- Marigolds
- Clover
- Chives
Our companion-planting finder can suggest more pairings for your bed plan.
Harvesting
Pick lemons when they are fully yellow, slightly soft to the touch and come away with a gentle twist — they can stay on the tree for weeks once ripe, so pick as you need them. A tree often carries fruit at different stages, giving you lemons over a long season.
The data gives 1095–1825 days to maturity — roughly 5 years at the top end — so this is a long-term plant, not a quick crop. For nursery-grown plants the wait is shorter than for seed, but patience is still part of the deal. Our harvest-date calculator works out expected dates from your planting date. Harvest in the morning, using a sharp knife or secateurs rather than tearing, which damages the plant.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Leaf drop in winter | cold and overwatering while the tree is barely growing | keep the tree in a bright, frost-free spot and water sparingly in winter |
| Wilting in dry spells | uneven watering | water deeply when the top inch or two dries out, and mulch |
| Aphids on the plants | aphids feeding on the crop | inspect weekly and act early — hand-pick, wash off, or use barriers |
Leaf drop in winter
Likely cause: cold and overwatering while the tree is barely growing. Cold is the main threat: even a light frost can blacken leaves, so move pots under cover at the first warning. Aphids cluster on the soft new shoots in spring, and a tree that is overwatered in winter — when it is barely growing — can drop leaves and sulk.
Wilting in dry spells
Likely cause: uneven watering. A dry spell while fruit or flowers are forming costs you the crop. Water deeply when the top inch or two of soil dries out, and mulch to keep moisture even.
Aphids on the plants
Likely cause: aphids feeding on the crop. Small sap-sucking insects that cluster on soft new shoots, weakening growth. A strong jet of water dislodges them, and ladybirds usually keep them in check.
Frequently asked questions
How long do lemons take to germinate?
14–28 days, in warm, moist conditions. Cool soil slows germination down, so wait for the soil to warm up and keep the seedbed evenly moist — not wet — until seedlings appear.
What soil pH do lemons need?
A soil pH of 5.5–6.5 suits lemons best. A simple soil test will tell you where your soil stands, and lime or sulfur can nudge pH up or down over a season.
When can I harvest lemons?
About 1095–1825 days after sowing, though weather and variety shift that by a week or two. For nursery-grown plants the wait is shorter than for seed.
Can I grow a lemon tree indoors?
Yes — in a large pot in the brightest spot you have, ideally a sunny south-facing window or conservatory. Give it as much light as possible, water when the top of the soil dries, feed in spring and summer, and move it outdoors for the summer if you can.