Well... yes and no. I cut lots of leaves off during the growing season, but they are distinctive and are called "sucker" leaves here in the U.S. They are different looking from the leaves that will produce blooms. The leaves that will produce blooms have very fine white hair like growths as the leave appears from the main stem. Additionally, it's fairly slow to grow, whereas the sucker leaf grows rapidly and never produces the fine hair structures. I find it best to trim the plant to form only a single main stem. Most of the leaves will be near the top of the pruned main stem and have had exceptional luck producing lots of tomatos. I never grow hybrid tomatos, only old, original heriloom varities... I find they are much healthier, but that's probably just a personal choice... Best of luck!