WSNLA Washington State Certified Professional Horticulturist Practice Exam

The designation of "Bottlebrush Hydrangea" is not commonly recognized as a type of Hydrangea. In contrast, the other names listed correspond to well-known types of Hydrangeas.

Bigleaf Hydrangea typically refers to Hydrangea macrophylla, which is famous for its large leaves and flowers that can change color based on soil pH. Peegee Hydrangea, or Hydrangea paniculata 'Grandiflora,' is known for its conical flower clusters and strong growth habit. Oakleaf Hydrangea, or Hydrangea quercifolia, is named for its distinct oak-shaped leaves and also produces beautiful, long-lasting flower clusters.

In botanical terms, each of these types has specific characteristics that have led to their inclusion in the common nomenclature of Hydrangea. However, the term "Bottlebrush Hydrangea" is misleading, as it is not associated with any recognized species within the Hydrangea genus.