Heres a quick example, this is a mini clone and the area Im referring to. From the very bottom moving up is an area that likes to finish slower. The very very bottom I feel like dont count its for sure different quality bud. If its well opened up and happy enough it actually will have all red hairs even to the very bottom.
The very bottom is a bit a wild card and is often known to grow nanners and sacs there. I dug up some more photos of a full size plant, the areas Im referring to. They get popcorny and if too shaded out it grows slower, I had issues though after that run. Maybe it should finish just fine I just had rootrot and pests.