i planted two of these last summer because i thought they were so pretty, and so far this year i have nothing but foliage, and not even the rich dark green that they were last year. are they somewhat delicate? we had a bit of a tough winter here in nj, so i'm wondering if i need to protect them this year. do they need to be fertilized? they are in a pretty good spot with morning sun and afternoon shade. my other hydrangeas have been doing well without any winter protection - blue billow, annabelle, limelight and st. theresa. i would love some tips if anyone has experience with these libelles. thanks!