Lime

Lime trees are grown as grafted, long-lived evergreen perennials, concentrated in tropical and warm subtropical growing regions where consistently warm conditions are available. Production includes both large commercial Persian lime plantings destined for fresh export markets and smaller-scale key lime production, often for local and regional markets.

Because key lime and Persian lime differ meaningfully in tree habit, fruit characteristics, and market use, orchard planning should identify which type is intended from the outset, since management and market expectations differ between them.

Family

Rutaceae (citrus family)

Genus

Citrus

Principal species

Citrus aurantiifolia (key or Mexican lime) and Citrus latifolia (Persian or Tahiti lime)

Growth habit

Evergreen tree, commercially propagated by grafting a fruiting cultivar onto a selected citrus rootstock

Key lime is believed to have originated in Southeast Asia and spread historically through trade routes into the Middle East, the Mediterranean, and later the Americas. Persian lime is understood to be a later hybrid selection that has become the dominant type in much of the modern commercial trade due to its larger, seedless fruit.

Lime is generally among the more cold-sensitive commercial citrus types and requires consistently warm, tropical-to-subtropical conditions for good growth and production; it is typically less cold-tolerant than lemon and many oranges. Cold events can damage or kill foliage, twigs, and fruit, making site selection important in marginal climates.

Key lime in particular is often considered more cold-sensitive and less vigorous than Persian lime, reinforcing the importance of matching lime type to local climate.

Lime performs best on deep, well-drained soils with good structure; loams and sandy loams are generally favored. As with citrus generally, lime has poor tolerance of prolonged waterlogging, which restricts rooting and increases the risk of root diseases.

Establishing a lime orchard begins with selecting the appropriate lime type (key or Persian) and a rootstock and cultivar combination suited to the site, since rootstocks vary in vigor, cold tolerance, disease resistance, and soil adaptation across citrus generally.

• Selection of key lime versus Persian lime based on market and climate
• Rootstock selection for vigor, cold tolerance, and disease resistance
• Site selection favoring consistently warm conditions given lime’s cold sensitivity
• Training and canopy management appropriate to the planting system

Nitrogen strongly influences vegetative growth, flowering, and fruit yield in citrus generally. Zinc and boron are micronutrients of particular importance in citrus nutrition, supporting normal leaf development and flowering and fruit set respectively.

Lime is grown both rain-fed in humid tropical regions and under irrigation in drier subtropical citrus-growing areas. Drip irrigation and micro-sprinkler irrigation are both used in lime production, applying water efficiently to the root zone.

Irrigation scheduling aims to support consistent growth and fruit development while avoiding the waterlogging that citrus tolerates poorly.

Citrus canker, caused by the bacterium Xanthomonas citri, is a serious, quarantine-significant disease affecting lime and citrus generally, producing raised lesions on leaves, stems, and fruit and prompting strict regulatory controls in many regions. Anthracnose can also affect lime, causing lesions on leaves, twigs, and fruit.

Scale insects and fruit flies are common citrus pests affecting lime, feeding on plant tissue or damaging fruit through larval development. Citrus psyllids are a group of concern citrus-wide as vectors of huanglongbing (citrus greening) in some regions; their presence and vector status should be assessed against local plant health authority guidance rather than assumed.

Management combines resistant or tolerant rootstocks where available, sanitation, monitoring, quarantine compliance, and — where justified — locally authorized control products applied according to their labels.

Lime is generally hand-harvested, with maturity assessed through indicators such as fruit size, color, and juice content, since lime does not continue to ripen significantly after picking. Persian lime is typically harvested and marketed while still green, whereas ripeness indicators and harvest practices for key lime can differ by market and region.

• Fresh-market fruit
• Juice for beverages, culinary, and food-processing uses
• Zest and essential oil extracted from the peel
• Garnish and flavoring uses in food and beverage preparation