The castleton estate in darjeeling39s kurseong south valley is among the world39s most celebrated tea gardens famed for its superb second flush varietythe combination of altitudes between 1000 and 2300m and the high proportion of original china tea bushes creates a far superior a second flush far superior to most other estates in darjeeling while first flush darjeelings picked between march and may are famed for their sparkling taste and clarity of cup the castleton second flush has a