crystals

My crystal garden has been growing now for a week or 2 and the crystals are just a little bigger because they grow  better in puddles then drops not like the book said. The salt is the best compared to the others and the others are not that good and they are very little.The sand also effects the growing of crystals on my tree and there hardly no crystals.I have also seen that crystals grow very well on plastic cups and on heat because heat expands them and vaporizes  the water.