Arico, you say they have been in the ground for two weeks? or do you mean two years? If indeed it is two weeks, don't get worried, they are just getting settled in. Make sure they have plenty of water. Plants tend to sleep the first year you plant them, creep the second year and finally leap the third year you have them in the ground.
Now it's it's two years, that's a different matter. Some hostas are just super slow growing and will take several years to start looking like much...
Good luck!!
