My PP grafts onto mature rootstock are well into 3 years and still not a single flower. My 2 year old Sugarloaf grafts, on the other hand, put out copious amounts of flowers in the last month; unfortunately, 99% of the buds were male (I believe I read this is common in the first few years). I have a few pea-sized SL fruit among a sea of dead male flowers, holding out hope they get to maturity. If I don't see any flowers from PP again next year, they might be getting reworked.