Citrus × aurantiifolia (Green Lime)

Where the green lime began

Citrus × aurantiifolia is an ancient hybrid formed and preserved through cultivation, with no standalone wild population. Its early history is associated with the eastern Himalayan region, and its ancestry combines citron with a papeda-type citrus. Genetic research identifies that second parent more narrowly as Citrus micrantha. Walter T. Swingle published the accepted Citrus combination in 1913, based on an earlier name published by Christmann in 1777.

Both ancestral lines come from warm, humid parts of southern and Southeast Asia. This places green lime among the most tropical cultivated citrus, shaped by sustained warmth, seasonal moisture and little prolonged winter cold. Centuries of cultivation carried it through South Asia, the Middle East and the Mediterranean before it became closely associated with the Caribbean, far beyond the region where its parent lineages first developed.

Sun, watering and winter care for indoor lime

Temperature

Green Lime needs warm conditions and should be kept away from chilling temperatures, preferably warmer while it is actively growing. Heater air can desiccate the thin leaves and flowers.

Light

Green Lime needs intense light to remain compact and productive. It tolerates direct sun well after gradual acclimation.

Watering

Allow the surface of the potting mix to partially dry, then check below the surface and water only when the centre is no longer wet. Fine lime roots and a leafy, fruiting crown dislike a long dry interval; drought can curl leaves and drop flowers or small fruit.

Substrate and roots

This acid lime has a fine, relatively shallow feeder-root system that performs best in an open, evenly textured medium. Use citrus potting mix or a loam-based container substrate amended with fine bark and pumice or perlite.

Humidity and airflow

Average household humidity can work, although this tropical lime grows more cleanly at moderate humidity when temperatures are high. Good circulation is useful around its dense twiggy crown, especially after leaf cleaning.

Fertilising

Use a complete citrus fertiliser that supplies nitrogen, potassium, magnesium and trace elements such as iron, manganese and zinc. Apply it according to the product label while the plant is actively making shoots, flowers or fruit; use the lower end of the labelled rate for a small plant, a recently repotted root ball or a specimen growing slowly.

Reading stress signs on Green Lime

• Dark, limp leaves after a cold night: Green Lime is highly sensitive to near-freezing conditions. Move the plant away from frost and cold draughts, water sparingly while the chilled plant is using little moisture and wait for the extent of twig damage to become clear before pruning.
• Wilting while the substrate is still wet: Roots may no longer be taking up water. Inspect for soft brown roots or a sour smell, remove dead tissue and repot in clean, loose substrate as described in the root-rot treatment guide
• Fine pale dots, bronzing or delicate webbing: Spider mites can build quickly on warm indoor citrus. Keep Green Lime apart from other plants, confirm moving specks with a white-paper tap test and rinse both leaf surfaces. Treat with a product intended for indoor plants, following its directions; the spider-mite guide explains the follow-up checks.
• Green fruit gradually turns yellow: A yellowing rind usually marks ripening. Check further when fruit softens unevenly, develops spreading lesions or drops alongside widespread yellowing, wilting or root problems.

Keep Citrus × aurantiifolia (Green Lime) away from pets

• The fruit flesh is edible, while leaves, peel and other plant material can irritate cats and dogs.
• These parts contain essential oils and psoralens that may cause vomiting, stomach pain, unusual tiredness or skin irritation.
• Contact a veterinarian if a pet chews the plant or develops symptoms. Seek medical advice if a person becomes unwell after exposure.

About the name Citrus × aurantiifolia

Citrus is the classical Latin name used for citron and related citrus plants. The epithet aurantiifolia means orange-leaved.

Carl Linnaeus established the genus Citrus in 1753 in Species Plantarum, page 782.

Gottlieb Friedrich Christmann first described it as Limonia × aurantiifolia in 1777 in Vollständiges Pflanzensystem, volume 1, page 618. Walter Tennyson Swingle later placed it in Citrus as Citrus × aurantiifolia in 1913 in Journal of the Washington Academy of Sciences, volume 3, page 465.