1. Star fruit trees bloom in April and the flowering period is from April to December.

2. The flowers are small and slightly fragrant. Several to many flowers form cymes or panicles. They emerge from the leaf axils or are attached to the branches. The flower branches and buds are dark red; the sepals are 5 and about 5 mm long. , arranged in an imbricate shape, with a thin cup shape at the base; the petals are slightly curled toward the back, 8-10 mm long, 3-4 mm wide, the back is lavender, and the edges are lighter, sometimes pink or white; stamens 5 -10; ovary with 5 cells, each cell has many ovules, styles with 5 cells. The berries are fleshy, pendulous, with 5 ribs, rarely 6 or 3 ribs, starburst shape in cross section, 5-8 cm long, light green or waxy yellow, sometimes with dark red. Seeds dark brown.

3. The growing environment of carambola trees is roadside, sparse forests or gardens. Tree species that likes warmth and moisture. It cannot grow in areas with frost damage. It can grow well in medium and low altitude areas with average annual temperatures of 20-26°C, extreme minimum temperatures of 2-7°C, and annual precipitation of 1000-2400 mm. It likes light but tolerates some shade. It likes moist and fertile soil, but it can also grow and bear fruit in dry and barren site conditions, but the growth varies greatly, with many fallen flowers and small fruits.