Buff cactus and maybe blover

Make cactus like pvz 2 cactus. Make it cost 175 and have it pierce because its pretty much a peashooter that counters 1 zombie. Doing this would give it more purpose outside fog and give it a new use in vs mode as well as other levels without breaking anything. 

Blover could also get a bit of a rework. Make it cost 150, give it a slower recharge, and make it blow all zombies back 1 tile. This would also give blover a use outside fog making its way in more strategies