Summer Sun cherry trees are frequently marketed as self-fertile and thus will crop without a pollinator. Some years ago East Malling Research Centre conducted a genetic analysis on the Cherry Collection growing at Brogdale and found the absence of the gene responsible for self-fertility in Summer Sun, thus taking it off the list of self-fertile varieties. I grow this variety and it is a good one, cropping well with good tasting fruit, but unfortunately it is one of a row of 12 different varieties, so I cannot confirm from experience that it is indeed self-fertile. Does any reader grow this in complete isolation from other cherry trees and thus confirm that it indeed crops well?
Howard Stringer
