Plant library · Fruit Trees
Citrus x aurantiifolia
Key Lime is a compact, thorny citrus that can serve as a small fruit tree where its canopy will not crowd paths or seating. At about 12 feet tall and 10 feet wide, it brings a substantial evergreen presence to a sunny plan. Citrus x aurantiifolia is best treated as a permanent anchor rather than tucked into a narrow mixed border.
Give Key Lime an open, full-sun position with circulation space on more than one side for watering, pruning, and harvest. Keep its thorny branching away from gates, play areas, doorways, and the narrow edge of a path. In climates outside its year-round outdoor range, use a generously sized container placed in the brightest available location so it can be moved under cover before temperatures drop below 50°F.
Plant Key Lime 12 feet apart, center to center, from another tree or large shrub. Its mature canopy can reach about 10 feet wide, so that interval leaves a modest working gap rather than allowing branches to meet. Set the trunk well back from walls, fences, and paths, accounting for low, thorny side branches as well as the canopy overhead.
Full sun supports a productive, compact garden placement; avoid sites shaded by buildings or larger trees for much of the day. Water regularly while keeping the root zone well drained. Choose a site or container setup that does not hold standing water, and leave the soil surface accessible for watering and routine maintenance.[1]
Flowers and fruit can appear year-round, with flowering strongest in spring and harvest peaking from late summer into winter. Reserve clear access to the tree through those seasons rather than filling the area beneath it with short-lived crops or dense temporary plantings. The tree remains a year-round feature in the plan.
This is a warm-climate perennial for USDA Zones 10 and 11, and cold protection is part of its placement decision. A sheltered location reduces exposure to cold winds, while a container gives more flexibility where winter temperatures are unreliable. Keep access routes clear of thorns when choosing the final position.[1][2]
Editorial content updated 2026-07-20.