Hydrangea Collection
The hydrangea collection (Hydrangea sp.) contains 3 species, 7 cultivars and a total of 25 specimens. Hydrangeas are known for their coarse foliage and giant flower heads. Though mostly white, there are now at least a couple of blue and pink flowering hybrids that are hardy. To maintain a blue color, acid fertilizer and aluminum sulphate must be added regularly to the soil mix.