Scale the U with the amount of petals you want your flower to have, and scroll V over time. I made the UV’s larger closer to the top of the mesh, and smaller at the bottom. This exaggerates the petal feel at the start of the ‘bloom’ and looks more like a circle splash at the edge. I hope that explains it well 
EDIT* also if anyone is looking for a super fast gif maker ScreentoGif is very handy