Green Thumb?

So, I did it again...I sentenced another 2 innocent plants to death. This Monday when Dave and I had a day off together we went to the Houston Garden Center in search of some flowers to brighten up our front entry way. Well, this is not the first time I've done this. Every time my mom came to visit (3 times) we went out to find me some "hardy plants". And every time, within only weeks I killed them. It is quite depressing seeing as my grandma (Grammy) and my mom are expert gardeners. My dad and my brother are also decent gardeners. How is it that I can tell if an animal isn't behaving normal or is sick at the slightest sign, but I can't remember to water a plant? I thought I had come to terms with this lack of talent, but I recently discovered that I have not. I still want to be good at it. It is hard for me to accept. So, we approached a lady who worked at the store and Dave proceeds to tell her that I have this disability. She points out a few plants and then looks at me and says, "even these need to be watered at least once a week"! She gave me a look like I was unworthy of such a responsibility. We purchased a Geranium and an African Iris. Hopefully this time I will do my part in giving them a better life than the plants before them! :) If not, Dave claims that he is pretty good and often planted flowers back at his house. Ron... Yvonne... can I count on him?