ilex meserveae Seeds. Blue holly Seeds, Meserve Hybrid Holly is a cold hardy, medium-sized, hybrid, broadleaf evergreen shrub in the Aquifoliaceae or holly family. These bushy hollies typically grow to 3 to 8 feet tall and 6 to 8 feet wide, although some occasionally reach 15 feet in height. They have a variable growth habit from vase-shaped to rounded and a slow growth rate.