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Carambola is a distylous species, with individual trees having either pin (long-styled) or thrum (short-styled) flowers; each flower is compatible with flowers of the other type, but self-incompatible and incompatible with flowers of the same morph. For satisfactory fruit production, growers must plant a mixture of the two morphs, one of which acts as a pollenizer. The presence of a pollenizer is sometimes achieved by bud-grafting to a branch of the producing tree material of a different morph. (Wong et al. 1994a,b)
Ingesting Carambola can be very dangerous for individuals with renal failure (e.g., Chang et al. 2002; Signate et al. 2009).