Has anybody been able to keep a Sweet Broom alive???

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A couple of weekends ago, my husband and I went over to the home depot to look for plants. I came across the most beautiful plant ever, Sweet Broom, and ended up buying 3 of them. I came home and planted one. I left the other 2 in their containers. I wanted to see if the one I planted would survive. By the next morning, all 3 of them were dead! I decided to wait a few days to see if they would get better but they didn't. We went back to the Home Depot to check out the other Sweet Brooms but they were all gone. I think they died too but I didn't ask so I don't know for sure. Anyway I asked one of the garden people if I could return mine and he said yes. So I came home, dug up the one I planted and grabbed the two other in the containers and took them back. Thankfully I got all my money back. I did a search on Sweet Brooms and it seems that they are really hard to keep alive. I was wondering if anybody has any, and if so how did you keep them alive? I would really love to have at least one in my garden but I won't buy one until I know what I need to do to keep it alive. Thanks so much!