Citrus × latifolia (Lime)

The uncertain journey of the Persian lime

Citrus × latifolia, commonly called Persian or Tahiti lime, exists only as a cultivated hybrid. Modern parentage treatments find contributions from papeda, pomelo, citron and mandarin lineages. Yu. Tanaka published the name in Systematic Pomology in 1951. The hybrid is usually triploid and is maintained mainly through vegetative propagation, which has helped preserve its familiar nearly seedless fruit.

Its exact place and date of origin remain unresolved. Tahiti, Persian and Bearss mark different stages in its cultivation and trade history; none denotes a natural native range. Its ancestral lines belong to tropical and subtropical Asia, with warm growing periods, strong seasonal light and regular moisture forming their broad climatic background. Tahiti-type limes were recorded in Florida by the late nineteenth century, although their cultivated history began earlier and probably in Asia.

Growing a container tree or shrub

Pruning and crown shape

Shorten selected upright shoots after their leaves harden, cutting above an outward-facing leaf to maintain a rounded crown and keep light reaching the centre.

Light

Give this lime tree the brightest practical indoor position, immediately beside a sunny south- or south-west-facing window. Add an overhead grow light if daylight does not reach the full crown.

Watering

Allow the surface of the potting mix to partly dry, then check below it and water when the centre is no longer wet. Rewet the complete root ball and let all surplus drain; water use rises when warm, bright conditions support new shoots or fruit.

Substrate and roots

Use a structured citrus or loam-based container mix amended with fine bark and pumice or perlite so fine roots receive both moisture and air. Flush the pot periodically where water or fertiliser leaves mineral deposits, and replace substrate that has collapsed or stopped rewetting evenly.

Temperature

Keep the tree frost-free and away from cold panes, air-conditioning, open-door draughts and abrupt temperature changes. Warmth supports active growth, but cool conditions must not be combined with a wet root ball.

Repotting

Repot when roots crowd the pot, push through drainage holes, cause water to bypass the centre or make the tree unstable and unusually thirsty. Increase the container gradually and keep the root flare at its established level.

Health checks for Citrus × latifolia (Lime)

• Leaves wilt although the pot feels wet: Roots in cold, compacted or saturated substrate may be unable to supply the leaves with water. Check for soft brown roots and a sour smell, then follow the root-rot guide if damaged tissue confirms the problem.
• Leaf edges brown after repeated feeding: Built-up fertiliser salts can scorch the tips and edges. Pause fertiliser, make sure the container drains freely and run clean water through the mix; empty all runoff from the outer pot.
• Young fruit drops during a dry spell: Citrus naturally sheds part of a heavy fruit set, but drought, hot dry air and weak nutrition can increase the loss. Restore steady moisture around the roots without keeping the mix saturated, then check if light and feeding are also adequate.
• Limes become yellow on the plant: Persian limes naturally lighten and turn yellow as they mature. Soft patches, wet lesions or widespread foliage decline point to a separate problem.

Keep Citrus × latifolia (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.

How did Citrus × latifolia get its name?

Citrus is the classical Latin name used for citron and related citrus plants. Latifolia combines Latin latus, broad, with folium, leaf, and describes the species’ broad leaf blades.

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

Tyōzaburō Tanaka first described it as Citrus × aurantiifolia var. latifolia in 1930 in Studia Citrologica, volume 3, issue 2, page 183. Yuichirō Tanaka later placed it in Citrus as Citrus × latifolia in 1951 in Systema Pomologicum, page 140.