Position
Thai lime trees enjoy plenty of sun, at least 6 hours every day. The best spot is an area that gets direct sunlight in the early morning or late afternoon. Thai limes do not tolerate very cold temperatures well, so ensure they receive warmth and sunlight.
Size
Thai limes can grow to a height of between 6 and 8 metres, with a width of 2 to 4 metres. Ensure that you provide sufficient space for the tree to grow, with a minimum of 5 metres between trees.
Soil Type
Well-draining, loamy, acidic soil is ideal for the Thai lime. Their roots are easily prone to root rot, so ensure that the soil has good drainage, as they cannot grow in poor soil. A soil pH of 6 to 6.5 is best suited. Adding one bag of acid compost would be ideal.
Mulching
Apply 2 to 5 centimetres of pine bark mulch to protect the roots from UV damage and drying out. It retains moisture and maintains an optimal pH. Do not let the mulch touch the plant stem, as it may cause infection or rot.
Watering
Watering is usually sufficient once per week. The soil should stay moist but not soggy, as the Thai lime is prone to root rot. Do not water just because the soil surface looks dry. The rule of thumb to test the water in the soil is to stick your finger in the soil up to the second knuckle. If the soil is then dry, it would need more watering.
Fertilizing
Thai limes enjoy fertilisers with a high nitrogen content. Use our slow-release nitrogen-rich fertiliser, like our all-purpose fertiliser (which is excellent for citrus). Apply 1 teaspoon of our berry fertiliser every 4-5 months.
Pests and Diseases
Aphids, citrus psylla, red scale, citrus greening. Spraying regularly with Agricultural Neem Oil or Effective Microorganisms (EM Control) will assist in either prevention or after the fact. If you already have aphids or mites, wash the tree with a harsh hosing, and when dry, spray with Neem oil or EM Control.
Practice good garden hygiene (remove fallen fruit and leaves).
Watch for root rot (caused by overwatering) and fungal infections during wet periods.
Pruning
Pruning is essential to keep the Thai lime tree small and manageable. Prune back the branches if they look weeping. Ensure that you remove diseased or dead branches that are dark brown in color, particularly those with dark brown discoloration below the bark. Prune off any sprouts that are growing about 25 centimetres above the soil line.