I almost never cast crystals/flowers. It doesn't break even in cost until the 5th turn after casting it, and then you are still down an action; if you value quick actions at 2 mana, you don't really break even until the 7th round. And early game quickcasts are arguably even more valuable, since they set up your economy. It depends on your build, of course, but generally that early-game mana would be better spent on spawnpoints or creatures that give you more actions, or discount rings.