What is LST? When flowering starts their will be a growth spurt and the throughout the weeks of flowering the plant will grow an extrea 30-50% in size. But the number of blades on the leaves will get less and less. I don't know why it does this, but I'm guessing the plant may do this to allow light to get to the lower branches. This is why a lot of cannabis strains end up haivng that cone, christmas tree shape.