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Propagation: Malaysian Purple Guava saplings are asexually propagated through branch grafting or grown from seeds.
Sapling Standards: Qualified planting stock should stand 30 to 40 cm tall.
Graft Specifications: Grafted plants must feature seamlessly joined union points, with nursery stock already displaying clear cotyledons and sprouting shoot leaves. The minimum graft height is 15 cm, ensuring optimal development by retaining only 2 to 4 bud eyes during planting.
Timing: When grown in well-tended home gardens, saplings survive year-round. However, in northern regions, planting is best conducted in February and March.
Spacing: Average spacing is 5 x 5 meters (yielding approximately 400 trees per hectare). In fertile soils with heavy fertilization and attentive care, wider spacing is appropriate. Conversely, newer, dwarf, and fast-yielding varieties can be planted at higher densities.
Pit Preparation: Dig planting pits measuring 80 x 80 x 80 cm or 60 x 60 x 60 cm. Fill each pit with roughly 25 kg of thoroughly rotted organic manure (about 10 tons per hectare) combined with 1 kg of superphosphate and 1 kg of potassium sulfate, completing the pit excavation and fertilization process 1 to 2 months prior to planting.
Planting Method: The technique is straightforward, but care must be taken not to break the root ball, and to avoid planting too deep or too shallow. Account for natural soil settling so that after heavy watering or rain, the root collar remains level with the surrounding ground surface.
Watering and Nutrition: A common misconception is that guavas are hardy and require no maintenance. While they tolerate drought and brief waterlogging, guavas demand ample water—particularly during fruit expansion and in well-drained orchard environments to minimize pests and diseases. Nutrient demands, especially for nitrogen, surpass those of citrus trees.
Year 1: Apply NPK 12-15-18 compound fertilizer 4 times a year, at 100g per application, supplemented with 50g of ammonium sulfate per round.
Year 2: Apply NPK 12-15-18 compound fertilizer 4 times a year, increasing the dosage to 200g per application, plus 100g of ammonium sulfate (totaling an annual application of 1,300g per tree).
Year 3: Apply NPK compound fertilizer 4 times a year, at 300g per application, plus 150g of ammonium sulfate and 50g of magnesium sulfate (totaling an annual application of 2,000g per tree).
Subsequent Years: As trees reach full bloom, increase fertilizer volumes proportionally, factoring in nutrient extraction corresponding to targeted fruit yields. One month prior to flowering, apply nitrogen-heavy fertilizers to stimulate heavy blossoming. With proper management, economic yields emerge by Year 3, reaching commercial outputs of 30 to 50 tons per hectare by Year 6 or 7 under intensive orchard management.
Fungal Pathogens:
Glomerella cingulata causes developing fruits to halt growth and turn black due to dense fungal spore coverage.
Fusarium and Macrophomina fungi in poorly drained soils can cause mortality in seedlings or 3- to 4-year-old trees.
Cephaleuros virescens (algal leaf spot) causes grey patches on leaves and fruits. These conditions can be treated by spraying copper-based fungicides.
Nematodes: Can cause significant damage in sandy soils, requiring strict crop rotation, enhanced fertilization, and consistent irrigation.
Fruit Flies (Dacus dorsalis): Active in June and July, attacking softening ripe fruits by laying eggs that hatch into maggots, rendering up to 70–80% of the crop unedible. Timely harvesting, gathering fallen fruits, and sanitizing alternative hosts (papayas, oranges, mangoes) are vital sanitation steps. Use Methyl Eugenol or protein hydrolysate traps baited with insecticides like Malathion.
Sucking Pests & Caterpillars: Mealybugs (Pseudococcus citri) heavily infest neglected orchards. Loopers, leaf-rolling caterpillars, and large hairy caterpillars feed on foliage and young fruit. Manage ant populations that cultivate mealybugs. Spray organophosphates or carbamates to control these pests.
Weed Control: Orchards must be kept strictly free of weeds, as weeds force guava roots to forage deeper, preventing them from utilizing topsoil nutrients and rendering surface fertilizers ineffective. Apply Paraquat (1,000 ml per 10 liters of water) carefully without splashing foliage, or perform shallow manual weeding around the base using a thin-bladed hoe.
Tropical fruit trees generally tolerate pruning poorly, but guava and hawthorn trees are exceptions because they bear fruit on new growth. Pruning stimulates prolific new shoots, allowing growers to manage blossoming locations. Training must start early to establish a sturdy framework. Pinch terminal tips to leave 4 primary scaffold branches, and 3 months later, prune back those frameworks to leave a pair of secondary branches on each. After several years of fruiting, thin out older, weak, and drooping wood.
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