Answer: Not all hollies are hardy in New Hampshire so perhaps those you planted are the wrong type for your growing region. Ilex aquifolium, the English holly with dark, spiny green leaves and clusters of red berries, isn?t hardy in New Hampshire. The ?blue hollies?, however, will survive your winters. Blue hollies are dense plants with glossy, blue-green foliage, red or yellow berries, and purplish or chartreuse twigs. Commonly available cultivars include Blue Prince and Princess, Golden Girl, Blue Maid, China Girl, and China Boy. The native hollies Inkberry (Ilex glabra) and Winterberry (Ilex verticillata) are both hardy. Inkberry is an evergreen shrub with black berries. If you like the look of hollies and want plants that will assuredly be hardy in your region, choose Inkberry or Winterberry. Good luck with your landscape.
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