Mexican Thornless Key Lime

Price range: $34.99 through $159.99

Mexican Thornless Key Lime is the classic Key lime—small, aromatic, and intensely tart—grown without thorns for easier care and harvest.

  • Traditional Key lime with bold acidity and fragrance.
  • Small, thin-skinned fruit prized for juice and zest.
  • Thornless selection for safer pruning and picking.
  • Best suited to warm climates or container growing.
  • Self-fertile.
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Description

Mexican Key Lime—also known as West Indian or Bartender’s lime—is the traditional lime behind classic pies, marinades, and cocktails. Unlike larger Persian limes, Key limes are small, thin-skinned, and intensely aromatic, delivering sharp acidity and concentrated flavor.

This thornless selection preserves the authentic Key lime character while eliminating the sharp thorns common to standard trees, making it a far more pleasant choice for home growers, patios, and container culture. Fruit is typically harvested green for peak acidity and may turn yellow if allowed to fully mature.

Overview

  • Classic Mexican/Key lime with bright, intense acidity.
  • Small fruit with thin rind and highly aromatic juice.
  • Thornless growth for easier maintenance and harvest.
  • Often seeded (not a seedless lime).
  • Self-fertile.

Growing Details

Latin Name: Citrus aurantiifolia
Site and Soil: Full sun; well-drained soil
Rootstock: 1-gallon trees on Flying Dragon; larger sizes on C-35
Hardiness: Very frost sensitive; best suited to USDA Zones 9–11
Bearing Age: Often fruits immediately; grafted trees may produce in their first season
Size at Maturity:
Flying Dragon: Typically 6–8 ft tall and wide
C-35: Typically 10–12 ft tall and wide
Note: Trees grown in containers remain smaller and are easily maintained with pruning.
Bloom Time: Spring, with additional blooms in warm, stable conditions
Ripening Time: Fall into winter; fruit may be held longer in mild climates
Pollination Requirements: Self-fertile
Seed Content: Often seeded
Pests & Diseases: Similar to other citrus; good airflow and drainage reduce issues

Additional Notes

  • Grower’s Insight: Key lime trees often carry flowers, immature fruit, and harvest-ready limes at the same time, allowing selective picking over an extended period in warm conditions.
  • Regional Insight: Performs best in true citrus climates (Zones 9–11); container culture allows successful growing outside these zones with winter protection.

Planting & Care

At a Glance – Mexican Thornless Key Lime

  • Sun: 3/4 day to full day of sun
  • Soil: Well-drained soil
  • Soil pH: Performs best between 5.5–6.5
  • Water: Moderate; consistent during establishment
  • Tree Size: Compact to medium, manageable with pruning
  • Pollination: Self-fertile
  • Harvest: Fall into winter
  • Hardiness: Frost sensitive; protect from freezing

Planting & Care – Mexican Thornless Key Lime

Site Selection

  • Choose the warmest, sunniest location available.
  • Sheltered microclimates improve growth and fruiting.
  • Excellent air circulation supports healthy citrus growth.

Soil Preparation (In-Ground vs Container)

  • In-ground: Excellent drainage is essential; raised planting helps in heavier soils.
  • In-ground: Slightly acidic soil (pH 5.5–6.5) supports nutrient uptake.
  • Container: Use a fast-draining citrus mix in a container with drainage holes.
  • Container: Containers allow easy protection in cooler climates.

Planting Instructions

  1. Dig a hole about twice the width of the root ball, or choose a container slightly larger than the root mass.
  2. Set the tree so the root flare sits at or slightly above finished soil or potting mix.
  3. Backfill gently and water thoroughly.
  4. Mulch lightly for in-ground trees, keeping mulch away from the trunk.

Watering (In-Ground vs Container)

  • In-ground, establishment: Keep soil evenly moist during the first growing season.
  • In-ground, established: Deep, periodic watering supports steady fruiting.
  • Simple check: Water when soil is dry 3–6″ below the surface.
  • Container: Water thoroughly, then allow the top couple inches of mix to dry.

Fertilizing

  • Key limes are heavy feeders and respond well to consistent nutrition.
  • Base feeding: Apply slow-release citrus fertilizer in early spring and early summer.
  • Support feeding: Supplemental liquid feeding during active growth promotes flowering and fruit set.
  • Reduce feeding later in the season to help the tree harden before winter.

Cold Care

  • This variety is very frost sensitive and should be protected during freezing weather.
  • Container trees can be moved to sheltered locations during cold snaps.

Pruning & Harvest

  • Light pruning maintains shape, airflow, and manageable size.
  • Harvest fruit green for classic Key lime flavor or allow to yellow for milder acidity.

General Tips

  • Best choice for traditional Key lime pies and cocktails.
  • Thornless habit makes this cultivar especially friendly for patios and home gardens.