Sweet Calabash, Conch apple, Hard-shelled Passionfruit, Sweet Cup, Water Lemon. Fast-growing vine, grows best in somewhat cooler than tropical climates. The rind is particularly hard, and tougher than most passion fruits. The fruits ripen from September to December, are light-yellow with a very hard shell, difficult to open but the seedy pulp is much enjoyed. Yellow-orange pulp is aromatically scented and flavored. In Jamaica, it is scooped from the shell and served with wine and sugar. The strained juice is excellent for making cold drinks. This species is noted for its resistance to pests and diseases that affect its relatives.