Lapin cherry , no flowers
 

I have a Lapin cherry tree that I planted 2 yrs ago (I guess it was
1yr old at the time). The tree did not put out any flowers yet (nor
did last year), there are plenty of leaves starting though.

On the other hand, a Van cherry that I planted last year is already
getting some flowers out... Any idea why this difference?

TIA,
Luca