I had a fabulous innuendo going and you two spoil all of my saucy fun.
Look at this analogy. If you have a flat, dehydrated sponge and it absorbs water... sweet Jesus it just grew! No it did not go through mitosis but it still grew in size. See? I think calling it growth due water uptake is good and can make everyone happy. I guess we could call it expansion instead of growth.
By the way, I laughed my butt off to that after school special comments rotflmao!