Grapefruit is a citrus hybrid originating in Barbados. It is an accidental cross between the sweet orange (C. sinensis) and the pomelo or shaddock (C. maxima).
When discovered in 1750 by Griffith Hughes, it was called the forbidden fruit, in reference to the garden of eden, and its rare and distinct existence.
From late spring to summer it bears fragrant, white flowers which are followed by spherical yellow-skinned fruit.
Grapefruits are best grown in a cool or temperate greenhouse or conservatory and moved outside during the summer months.
Under glass, grow in loam-based potting compost (JI No. 2) in full light, with shade from hot sun. In growth, water freely, mist daily and apply a balanced liquid every 2-3 weeks; water sparingly in winter