This Climbing Hydrangea blooms with large white flowers and the dense foliage is a great place for birds, such as Blackbirds, to build their nests. This Climbing Hydrangea blooms with large white flowers and the dense foliage is a great place for birds, such as Blackbirds, to build their nests. Climbing plants attract a wide variety of beneficial insects and other wildlife. Climbers can be very versatile and can be used to cover bare walls or screen unsightly areas of garden. Many types will cling to the surface naturally however others such as Clematis or Honeysuckle will need training over wires or trellis for additional support.