i bought two bunny tail grasses a couple of weeks ago. potted one and left the other one in its original pot from the store. the one i potted was starting to bloom with bunny tails but the next day and thereafter I noticed it becoming more stressed and now the grass has dried out. I took a look at the one i didn't pot and it looks like it is going down the same path. I have watered both of them (not to the extreme) - what am i doing wrong? I hear that these grasses are easy to grow and are drought tolerant. help?