Dwarf crape myrtle won't grow
I got 2 dwarf crape myrtles, Razzle Dazzle, from a friend. Planted them about a year ago, In summer. They were very small but seemed to take nicely at first but just didnt grow much. I didn't expect them to bloom or grow to much that first year. Of course they died back in winter and they did pop back up in spring. However they just don't want to grow. They are staying very small, seems not much bigger then when I put them in. It's like they just want to stay status quo. I can't seem to motivate them to take off. I expected them to grow well this year and am disappointed. Can anyone offer suggestions as to what might be wrong or what I can do? I have fertilized with an all purpose fertilizer and I mulched around them. Do they need lots of water perhaps?