Pollination Information for Mexican Key Lime (Citrus × aurantiifolia)

The Mexican Key Lime (Citrus × aurantiifolia) is a self-pollinating and highly productive fruit tree that can grow up to 6 to 13 feet tall. However, hand pollination is sometimes needed to enhance fruit production and quality.

For natural pollination, Mexican Key Lime trees rely on bees, butterflies, moths, and other insects. They visit the flowers to collect nectar and pollen, stimulating the transfer of pollen between male and female reproductive parts of the flowers. The pollinators are attracted by the fragrant and showy white flowers that bloom in clusters from late winter to early spring.

Hand pollination is recommended when the flowers are not producing fruit or there is a low fruit set rate. To hand pollinate, use a small brush or cotton swab to transfer the pollen from the stamens of one flower to the stigma of another flower. Pollination is most effective during the early morning before the flower petals fall and when the humidity is high.

Mexican Key Lime trees can also be cross-pollinated with other citrus varieties, such as Meyer lemon and Valencia orange.

It is important to note that Mexican Key Lime trees require a certain amount of cold temperatures in order to flower and set fruit. In areas with mild winter temperatures, the tree may not produce fruit without a period of dormancy induced by cold weather.

Mexican Key Lime (Citrus × aurantiifolia) FAQ

General Information

1. What is a Mexican Key Lime?

   A Mexican Key Lime, also known as Citrus × aurantiifolia, is a type of citrus fruit that is native to Southeast Asia and has been widely cultivated for its acidic juice and flavorful zest. It is commonly used in Mexican cuisine for dishes such as ceviche, guacamole, and key lime pie.

2. What does a Mexican Key Lime look like?

   A Mexican Key Lime is a small citrus fruit that measures about 2-3 inches in diameter. It has a thin, smooth, and glossy skin that varies in color from green to yellow when ripe. The flesh inside is acidic and juicy, with tiny seeds and a bright green color.

3. What is the difference between a Mexican Key Lime and a regular lime?

   While both Mexican Key Limes and regular limes are acidic citrus fruits, there are a few key differences. Mexican Key Limes are smaller, rounder, and smoother than regular limes. They also have a thinner skin and a more acidic and aromatic juice.

Growing Conditions

1. What type of climate do Mexican Key Limes grow in?

   Mexican Key Limes are tropical fruits that grow best in warm and humid climates. They require a minimum temperature of 50°F to survive and thrive in temperatures between 70-85°F. They can grow in full sun or partial shade.

2. What type of soil do Mexican Key Limes need?

   Mexican Key Limes prefer well-draining, sandy loam soil that is rich in organic matter. The soil should have a pH between 5.5-6.5, which is slightly acidic.

3. How often should I water my Mexican Key Lime tree?

   Mexican Key Limes require regular watering, especially during hot and dry spells. Water deeply but infrequently, making sure the soil stays moist but not waterlogged. Be careful not to let the soil dry out completely, as this can stress the tree and reduce fruit quality.

4. What type of fertilizer should I use for my Mexican Key Lime tree?

   Mexican Key Limes benefit from regular applications of a balanced citrus fertilizer that is high in nitrogen, phosphorus, and potassium. Fertilize young trees every 3-4 months and mature trees every 6-8 months.

Harvesting and Storage

1. When is the best time to harvest Mexican Key Limes?

   Mexican Key Limes are typically harvested when they are ripe, which is when the skin turns a yellow-green color and the fruit feels slightly soft to the touch. This usually occurs in late summer or early fall.

2. How do I store Mexican Key Limes?

   Mexican Key Limes can be stored at room temperature for up to a week, or in the refrigerator for up to two weeks. They can also be frozen for later use by squeezing the juice into ice cube trays and freezing them. The frozen cubes can be stored in airtight containers in the freezer for up to 6 months.

3. How do I know if my Mexican Key Limes have gone bad?

   Mexican Key Limes that have gone bad will typically have a soft or mushy texture, a sour or off-putting smell, or mold on the skin. If in doubt, it's best to discard them.

Planting & Care for Mexican Key Lime

Planting

Mexican Key Lime thrives in warm climates and is best planted in a location that receives full sun exposure for at least 6-8 hours per day. The following steps should be taken when planting:

• Choose an area with well-draining soil and good air circulation.
• Dig a hole that is twice as wide and deep as the tree’s root ball.
• Place the root ball into the hole and backfill with soil, tamping it down gently as you go to eliminate air pockets.
• Mulch around the base of the tree to retain moisture and suppress weeds.
• Water the tree thoroughly after planting.

Care

Taking care of your Mexican Key Lime is essential to keep it healthy and produce a bountiful harvest. Here’s what you should do:

• Water young trees once or twice a week during the growing season. Mature, established trees need watering only during prolonged dry periods.
• Keep weeds and grass away from the base of the tree, as they can compete for nutrients and water.
• Fertilize the tree every three months during the growing season with a citrus-specific fertilizer.
• Prune the tree only to remove dead or diseased branches and to control for the tree's size.
• Monitor the tree for pests, such as spider mites or scale insects and treat accordingly.
• Harvest ripe fruits when they have turned yellow and are plump and juicy.

With proper planting and care, your Mexican Key Lime tree will yield delicious fruit for years to come.