Diospyros virginiana In respect to the power of making heartwood, the persimmon rarely develops any heartwood until it is nearly one hundred years old. This heartwood is extremely close-grained and almost black, resembling ebony (of which it is a true variety). It is a common misconception persimmon fruit needs frost to ripen and soften, called bletting. Some, such as the early-ripening varieties "pieper" and "NC21"(also known as "supersweet"), easily lose astringency and become completely free of it when slightly soft at the touch—these are then very sweet, even in the British climate. On the other hand, some varieties (like the very large
Wildlife of Mauritius heathland in the mountains. Most of this natural vegetation has been destroyed and what remains is threatened by the spread of introduced plants. Native trees include eleven surviving species of Mauritius ebony ("Diospyros tesselaria", "Diospyros egrettarum", "Diospyros revaughanii", "Diospyros melanida", "Diospyros leucomelas" and several others), takamaka ("Calophyllum tacamahaca"), manglier vert ("Sideroxylon cinereum"), manglier rouge ("Sideroxylon puberulum"), Ox tree ("Polyscias maraisiana"), Bois de Natte ("Labourdonnaisia" species) and a range of other indigenous and endemic tree species. The palm species that are indigenous to the island of Mauritius comprise "Acanthophoenix rubra" (possibly other species), "Dictyosperma album (var. album & conjugatum)", "Hyophorbe amaricaulis",