DanDanDan: I'm not an expert either, but firstly are they the fruiting cheery type not flowering cherries. I haven't had to prune mine but it's only 2 years old. Last year we only got a dozen or so cherries but it's laden this year. Also could be the variety might need a pollinator, Hope this helps.
(do skréše) Jak chceš vlitnót do špilo se špilošem, keré bode asi tak dobré jak te, možeš zvolet vežadované rozsah BKR v novy nabidce ke špilo. Potem nikdo, kdo do rozsaho nepasoje, toďto nabidko ani neovidi. (Katechka) (okázat šecke vechetávke)