A Detailed Guide to Passion Fruit Planting Methods and Key Techniques

Passion fruit is a herbaceous climbing plant of the genus Passiflora in the family Passifloraceae, about 6 m long; the stem has fine stripes and is hairless; the flowers have 5 petals, equal in length to the sepals; the base is light green, the middle is purple, and the tip is white; the berry is ovoid, 3-4 cm in diameter, hairless, and purple when ripe; the seeds are numerous and ovate. The flowering period is June, and the fruiting period is November.

I. Environmental Requirements for Passion Fruit

(1) Temperature. The suitable growing temperature for passion fruit is 20°C-30°C. It generally grows well at temperatures not lower than 0°C, but at -2°C the plant will suffer severe damage or even die. It is suitable for planting in areas with an average annual temperature of 16-18°C or above.

(2) Water. Passion fruit generally grows well under conditions with annual rainfall of more than 1500 mm and even distribution.

(3) Light. As a tropical fruit, passion fruit likes ample sunlight to promote vine growth and nutrient accumulation. Long-day conditions are favorable for the flowering of passion fruit. In areas with annual sunshine hours of more than 2100 hours, passion fruit has good vegetative growth, accumulates more nutrients, grows vines quickly, fruits early, and yields abundantly.

(4) Soil. Passion fruit has strong adaptability and does not have high soil requirements. However, for large-scale production, the soil layer should be at least 0.5 m deep, and the soil should be fertile, loose, and well-drained, with a suitable soil pH of 5.5-6.5.

II. Variety Selection for Passion Fruit

Tengchong currently has nearly 1200 mu planted with passion fruit, but because the vast majority are old local varieties, they have poor disease resistance, small fruit, and low yield. For commercial planting, it is advisable to choose the hybrid varieties Zixiang No. 1 and No. 2 bred in Brazil. Zixiang No. 1 is early-maturing, with a single fruit weight of 60-130 g, and can be harvested and marketed in June; Zixiang No. 2 is slightly later. Planting in the same year brings harvest in the same year, with a yield of more than 1000-1500 kg per mu.

III. Orchard Planning and Construction for Passion Fruit

(1) Site selection and excavation. The development site for passion fruit planting should be chosen in areas with relatively convenient transportation, facing the sun and sheltered from the wind, and with a relatively thick soil layer. It can be gentle sloping land, terraced land, or flat land, requiring deep and relatively fertile soil, good drainage, and preferably irrigation conditions. The planned orchard land should be excavated throughout the field with an excavator to a depth of 50-60 cm to facilitate the vigorous later growth of passion fruit.

(2) Trellis construction. Passion fruit is a climbing plant and depends on trellis support for normal growth. A flat-topped trellis can be used. The post spacing is 4 x 5 m, and the general trellis height is suitably 1.8-2 m. For trellis materials, 10 x 10 x 250 cm cement posts can be selected. On the top of the posts, 16 mm2 steel strand is laid along the main lines in both directions, and along the row spacing direction a 2.0 mm2 steel wire is pulled every 100 cm and tightened with a wire tensioner.

(3) Digging planting holes. The spacing of planting holes is 4 x 5 m, with 30 plants per mu, and the hole depth is 60 x 60 x 60 (cm). Each hole is applied with 25 kg of farmyard manure and 0.5 kg of phosphate fertilizer as base fertilizer.

(4) Planting. Passion fruit can be planted in all four seasons, but it is most suitable after the beginning of spring. Planting should be done on cloudy days or sunny days after rain. When planting seedlings, old leaves should be properly pruned off, and the nutrient bag should be broken and removed, not buried in the soil. When setting the seedlings, an appropriate amount of decomposed organic fertilizer should be mixed evenly with sandy loam soil and used as planting soil or covering soil. When planting, the root system should be straightened, soil should be filled in layers, and it should be pressed firmly. After planting, water the roots promptly. For newly dug planting holes, when planting, the root collar of the seedling should be slightly 8-10 cm above the ground surface, and after planting the tree basin should be formed. After checking that no roots are exposed, cover the tree basin well with plastic film and press it down. After the seedlings survive, remove the plastic film in May-June.

IV. Orchard Management for Passion Fruit

(1) Fertilization. For newly planted passion fruit, nitrogen fertilizer is mainly used in the early stage to promote plant growth. The root system begins to grow 10-15 days after planting, and 0.5% dilute urea or dilute human manure and urine can be applied, then applied once every 20 days, with 5 kg of decomposed human manure and urine or 0.1 kg of compound fertilizer per plant each time.

Each year, apply 20-30 kg of farmyard manure, 0.6-0.7 kg of urea, 0.6-0.9 kg of phosphate fertilizer, and 1.2-1.3 kg of potassium fertilizer per plant. Farmyard manure and phosphate fertilizer should be composted and decomposed, then applied in furrows around the Beginning of Spring. Urea and potassium fertilizer should be applied once a month during the flowering and fruiting period, with 0.3-0.4 kg of mixed fertilizer per plant.

(2) Irrigation. Passion fruit is a shallow-rooted plant and likes moisture. It is both intolerant of waterlogging and afraid of drought. Therefore, first of all, drainage ditches should be opened well to prevent water accumulation in the orchard; if it does not rain for a long time, consider irrigating once.

(3) Soil management. After clearing the orchard in winter, the whole orchard should be turned over, and the turning should be combined with burying the weeds and residual branches and fallen leaves from orchard clearing. Then, 2 kg of phoxim granules and 25-30 kg of lime should be broadcast per mu.

V. Tree Training and Pruning of Passion Fruit

(1) Guiding vines onto the trellis. After the young seedlings resume growth, remove buds once every 5 days to promote rapid and thick growth of the main vine. When the main vine grows to 40-50 cm, insert bamboo supports in time to guide the main vine onto the trellis. After the main vine is on the trellis, frequently guide the side vines to coil and grow in a spiral on the steel wire trellis. After the side vines fill the trellis, top them and tie them. The side vines should run one branch per side, which helps result-bearing branches fill the trellis early.

(2) Training young trees. Use the single main vine, double-layer, four-main-branch training method. When the main vine grows to 70-80 cm, keep 2 side vines and guide them separately onto the trellis as the first layer of main vines. When the plant grows to 150-160 cm, keep 1 strong side branch, and together with the extended shoot of the main vine, use them as the second layer of main branches, guiding them separately onto the trellis in the opposite direction to form a double-layer, four-branch vine structure. During this period, all side branches and sprouting branches on the main vine below 80 cm and between 80-160 cm should be pruned off or removed.

(3) Training old trees. Shoots sprouting after fruit harvest in the previous year almost all produce fruit-bearing vines at the nodes above the middle. In the previous year, as many fruit-bearing mother branches as possible should be retained, but to prevent the trellis surface from becoming too dense, pruning should be done as early as possible after fruit harvest. Keep vines according to 2 main branches. Branches close to the main trunk bear fruit first, and after the fruit matures and is harvested, prune immediately to 2-3 nodes. Buds sprouting again from the base of the main branch can form new fruit-bearing branches. After the last batch of fruit is harvested in winter, all fruit-bearing branches should be pruned from the base.

VI. Pest and Disease Control for Passion Fruit

(1) Main diseases and control. The main diseases include seedling damping-off, mosaic disease, phytophthora blight, and stem base rot. Control methods:

1. Choose clean soil for seedling raising, maintain field moisture, especially prevent the soil from being too wet, stay away from melons and solanaceous vegetables, and promptly remove and burn diseased plants and diseased leaves.

2. Chemical control: use Ridomil, 75% chlorothalonil 800-fold solution, and 50% carbendazim wettable powder 1000-fold solution for control.

(2) Main insect pests and control. The main insect pests include fruit flies, mites, scale insects, and scarab beetles. Use 90% trichlorfon 800-fold, chlorpyrifos 800-fold, phoxim, etc. for control.

VII. Timely Harvesting of Passion Fruit

Generally, harvest 10 days before fruit drop, when the fruit color turns purple and it has a slight fragrance, but fresh fallen fruit can also be picked up from the ground.