How to Grow Lemon Tree

Growing guide

Overview

The lemon tree (Citrus limon) is a small evergreen that produces fragrant white blooms and tart yellow fruit, and it’s a favorite because it can fruit indoors in a sunny window or outdoors in warm climates. It needs full sun, moderate water, and well-drained soil to thrive. In zones 9a–11b it grows year-round outdoors; elsewhere it lives in a container and moves inside before frost.

Soil & planting prep

Use loamy or sandy, well-drained soil with a pH of 5.5–6.5. In the ground, plant in a spot that gets at least 6–8 hours of direct sun and space trees 8–12 feet apart. In containers, fill with a citrus or cactus mix that drains fast; set the tree so the root flare sits at or just above the soil line.

When to plant

Plant outdoors after the last frost date, once nighttime temperatures stay above 50°F. In zones 9a–11b, that’s usually spring; in colder zones, keep the tree in a container and move it outside only after the last frost, then bring it back in before the first fall frost. There is no indoor seed-start window for this guide—buy a grafted or potted tree and plant it when the weather is warm.

How to plant

1. Choose a container at least 15 gallons or a sunny, frost-free spot in the ground.
2. Dig a hole or fill the container so the root ball sits at the same depth it grew in the nursery, with the root flare just above the soil.
3. Backfill with native soil or citrus mix, firm gently, and water deeply until it drains freely.
4. Water thoroughly and let the top 2 inches of soil dry before watering again.
5. In containers, place the tree where it gets 6–8 hours of direct sun; in the ground, keep it 8–12 feet from other trees or walls.

5 common mistakes to avoid

• Planting outdoors too early in spring: lemon trees are not frost-tolerant, and a late freeze kills new growth or the whole tree. Wait until after your last frost date and nighttime temperatures are above 50°F.
• Letting the soil stay soggy: lemons hate wet feet, and constant moisture causes root rot and yellowing leaves. Always use a fast-draining mix and water only when the top 2 inches of soil are dry.
• Giving too little sun indoors: a lemon tree in a dim corner drops leaves and refuses to flower. Put it by the sunniest south- or west-facing window, or use grow lights for 6–8 hours a day.
• Skipping fertilizer: citrus are heavy feeders, and without regular feeding they produce small, pale leaves and little fruit. Feed with a citrus fertilizer in spring and summer, following the label rate.
• Moving the tree straight from indoors to full outdoor sun: sudden direct sun scorches leaves. Harden it off over 7–10 days, starting in shade and gradually increasing sun exposure.

Harvesting & storage

Lemons are ready when they reach full size and turn bright yellow, which can take several months after flowering. Cut or twist the fruit from the tree, leaving a short stem, and use it fresh. Store lemons at room temperature for about a week or in the refrigerator for up to a month.

Companion planting

Good companions for lemon trees include marigolds, nasturtiums, and other low-growing flowers that don’t compete for water. Avoid planting mint or other aggressive spreaders nearby, as they can steal moisture and nutrients.

Growing in containers

Lemon trees grow well in containers and need at least a 15-gallon pot with drainage holes. Use a citrus or cactus mix, water when the top 2 inches of soil are dry, and move the pot indoors before frost in cold zones.

Pro tips

In cold zones grow in containers and bring indoors before frost. Keep near a sunny window or under grow lights. Water when top 2cm of soil is dry. Feed with citrus fertiliser in spring and summer.