Starfruit 'Carambola' Tree

Carambola, or starfruit, is a tropical evergreen tree grown for its distinctive ribbed yellow fruit, which forms a star when sliced. It also has compound leaves that fold in darkness or when disturbed and small pink to mauve flowers borne along branches and older stems. In warm climates it can become a medium-sized tree, so choose a sheltered sunny site with room for its canopy and regular access to water. ## Climate and siting The [University of Florida IFAS guide](https://ask.ifas.ufl.edu/publication/mg269) recommends warm locations, well-drained soil, steady soil moisture, and protection from wind. It notes that young leaves may be injured around 30–32°F and that prolonged cold can damage branches or kill trees. The [Northern Territory Government growing guide](https://nt.gov.au/environment/home-gardens/growing-vegetables-at-home/carambola-starfruit) reports trees up to 8 m tall, pink or mauve flowers, and best growth in well-drained clay loam around pH 5.5–6.5. The existing minimum hardiness zone of 4 is inconsistent with this tropical frost sensitivity, but the cited sources do not establish a precise USDA zone minimum, so that value is cleared rather than replaced with an unsupported estimate. ## Fruit and care Carambola produces several flowering and fruiting periods in warm regions; Florida's main bloom periods are spring and fall, with some flowering at other times. Plant grafted nursery trees when fruit quality matters because seedlings may vary. Keep soil evenly moist without leaving roots in prolonged standing water, and prune selectively to contain size and maintain access for harvest. Dry soil, wind, and saline soil can injure the tree; high-pH soils may also cause micronutrient deficiencies. ## Maintenance Water regularly during dry weather and maintain mulch over the root zone, keeping it away from the trunk. Remove crossing or inconvenient branches and contain height with selective pruning after harvest. Protect young trees from cold and sustained wind.