i dont ever trim leaves, if something is in the way it only takes a few seconds to tie it down or tuck it. You dont lose all the stored energy, mess up its ability to *breathe* so that it has to stop what its doing and grow more little leaves into big leaves to replace the ones it lost, they also are the most effecient at photosynthesis, and, leaves are not as solid as they appear, it may seem they are blocking light, but in reality about 15% of the light hits chloroplasts and interact with them for photosynthesis, the other 85% keeps right on going.