More than 1,000 hydrangea, of 150 varieties, are interspersed with the rhododendron and are planted on a forested north-facing slope of mature deciduous trees with gentle sloping walkways gracing the hillside. Their blossoms appear in May and continue to October. Colors include blue, pink, white, lavender and purple depending on the soil acidity.

The Hydrangea Garden, with 5 months of blooms, tapers from the house to the start of the Pleasance Garden near the valley. Wooden benches provide rest along the path. Views are stunning from above and below.