How to Grow a Star Fruit Tree: A Detailed Guide to Planting Methods and Key Techniques

Star fruit is a fruit that looks like a five-pointed star, very eye-catching, and it commands a relatively high price on the market, so it is grown in many regions. So how do you grow a star fruit tree?

1. Site selection and orchard establishment

If building a star fruit orchard on hilly land, it is best to choose a south- or southeast-facing mid-to-lower slope with a water source for irrigation, relatively good soil, and a gentle gradient. For orchards on flat land, drainage and irrigation ditches are generally required; their depth should be determined by the height of the groundwater table and improved year by year through further digging.

2. Planting

For star fruit planting, three spacing options can be used: 3×4 m, 3×5 m or 4×4 m. Before planting, large planting holes should be dug and fully decomposed organic fertilizer applied as a base fertilizer. In flatland orchards, the planting holes should be 50 cm deep and 50 cm wide; where the soil is poor, they can be made appropriately deeper and wider. In hilly orchards, the planting holes should be 1 m deep and 1 m wide, and after planting the holes still need to be expanded and the soil improved year by year.

3. Management techniques after planting

(1) Early shaping: The main goal for a star fruit tree is to develop a compact, round-headed canopy. After the young tree is planted, cut off the top at 40-50 cm above the ground. After new shoots emerge, keep 3-4 evenly distributed main branches; when the main branches are 30-40 cm long, pinch out the growing tips, leaving 2-3 buds per branch. Because star fruit has a strong ability to sprout shoots and form branches, shaping should follow this principle; as the number of branch orders increases, a high-yielding canopy can be formed from spring planting to the end of the following year. During shaping, bamboo stakes or thin string can be used to support weak, slender branches to prevent them from drooping, and to keep the main branches evenly distributed.

(2) Pruning during the fruiting period: Pruning of star fruit trees during the fruiting period should be light rather than heavy. Branches in the middle and lower parts should be retained as much as possible so that they are arranged in layers, with branches and leaves evenly distributed and moderate density. For young and vigorous fruiting trees, it is advisable to remove dominant branches and thin out some of the vegetative branches in the upper part of the canopy to suppress growth, and to shorten branches as thick as a thumb in different directions year by year to maintain strong tree vigor and ensure annual yield. For old and weak trees, branches in the upper part of the canopy can be cultivated to shade the trunk, and vigorous water shoots can be fully used to fill gaps in the canopy and renew old branches.

(3) Watering: The absorbing roots of star fruit are distributed relatively shallowly and are easily affected by external conditions, so in dry, hot seasons they should be irrigated in time; the tree basin should be covered with weeds to keep the soil constantly moist and lower the soil temperature, so as to suit the normal growth of the root system. Star fruit roots cannot tolerate waterlogging; prolonged soaking can cause root rot, leaf drop and fruit drop, so before the rainy season the drainage ditches should be cleared to lower the groundwater table. Hilly orchards should have their planting holes expanded and soil improved in time to prevent water accumulation.

(4) Applying sufficient base fertilizer: For newly planted star fruit trees, base fertilizer is applied when the holes are dug, with 10-15 kg of decomposed poultry and livestock manure, 1 kg of bran fertilizer and 1 kg of superphosphate per hole. The base fertilizer must be mixed evenly with soil before being backfilled, then the topsoil should be backfilled and mounded 20 cm above the ground to prevent water accumulation. For fruiting trees, it can be applied in December each year or after the last harvest and pruning, with 15-20 kg of decomposed poultry and livestock manure, 1.5 kg of bran fertilizer and 1-1.5 kg of superphosphate per tree, placed in a ring-shaped ditch dug around the drip line of the canopy.

Overall, star fruit trees are very easy to grow: just choose a good site, dig the holes well, and plant the saplings in the holes. Once planting is successful, all that is needed is good work on watering, fertilizing, and pest and disease control.