Citrus needs abundant light, excellent drainage, regular moisture, and protection from temperatures below the tolerance of the specific variety. In cold-winter areas, grow citrus in a movable container and bring it into a bright, protected space before damaging cold arrives.
Choose the right citrus and location
Cold tolerance differs among limes, lemons, oranges, mandarins, kumquats, and their cultivars. Fruit can be injured before wood is killed, and a young tree is generally more vulnerable than an established one. Check the variety's mature size, rootstock, heat needs, and cold tolerance before buying from the citrus tree collection.
Outdoors, choose a warm, sunny microclimate with air movement and well-drained soil. Avoid low spots where cold air or water collects. Indoors, place the tree at the brightest suitable window or supplement natural light, and keep it away from heating vents.
Acclimate a newly delivered citrus tree
A tree moved abruptly from protected conditions into intense sun can develop leaf scorch. Begin in bright indirect light or gentle morning sun, then increase exposure gradually over about one to two weeks. Reverse the process before moving a container-grown tree indoors in fall, and inspect the foliage for pests first.
How to plant citrus in the ground
- Dig a hole no deeper than the root ball and about twice as wide.
- Remove the container and loosen circling roots without tearing the root ball apart.
- Set the root flare slightly above the surrounding grade. Never bury the trunk or graft union.
- Backfill mostly with the native soil, water thoroughly, and form the grade so water drains away after soaking the root zone.
- Apply 2–3 inches of mulch over the soil surface, leaving a clear gap around the trunk.
Do not add fertilizer to the planting hole. If drainage is poor, use a raised planting area or a container rather than placing the root ball in a water-holding basin.
Growing citrus in containers
Use a sturdy pot with unobstructed drainage holes and a fast-draining potting mix. A container only modestly larger than the current root ball is easier to water correctly than an oversized pot. Empty saucers after watering. Repot when roots circle densely or the mix no longer drains well.
The printable fruit and nut tree growing guide complements the detailed potted fruit and nut tree guide for container setup and ongoing care.
Watering and fertilizing citrus
Water deeply, then wait until the upper layer of soil begins to dry before watering again. Frequency changes with temperature, wind, pot size, soil, and tree growth; use the soil as the guide. Yellow leaves can result from several causes, including root stress from excess water, so diagnose conditions before adding fertilizer.
Feed actively growing citrus with a fertilizer labeled for citrus and containing needed micronutrients. Follow the product label and local timing guidance, and reduce or stop feeding when growth slows indoors. Keep granular fertilizer away from the trunk.
Pruning, pollination, pests, and harvest
Most citrus needs only light pruning to remove dead, damaged, crossing, or rootstock-sucker growth. Avoid heavy canopy thinning that exposes bark to sunburn. Most commonly grown citrus cultivars are self-fruitful, but indoor flowers may benefit from gentle hand pollination if insects are absent.
Inspect leaf undersides and stems for scale, mites, aphids, or other pests. Start with sanitation and a strong water spray where appropriate, then identify the pest before selecting a treatment. Harvest timing varies: judge by the variety's normal color, flavor, and season rather than color alone.
Cold-weather checklist
- Know the cultivar's cold tolerance and watch local forecasts.
- Water the root zone ahead of a freeze if the soil is dry.
- Move containers to shelter before damaging cold.
- Cover outdoor trees to the ground with frost cloth without crushing the canopy; remove or vent covers as temperatures rise.
- Wait to prune freeze damage until the extent of live wood is clear.
