When Greenleaf Nursery introduced Hydrangea macrophylla ‘Grenan,’ more commonly known as the Nantucket Blue Hydrangea, under their Garden Debut brand, they introduced a re-blooming Hydrangea that was versatile, and durable. Much like the popular Endless Summer Hydrangea, Nantucket Blue blooms on old and new wood from spring to fall and produces gorgeous, pink or blue flowers depending on the acidity level of the soil it’s planted in. What sets it apart from the Endless Summer is that it has significantly stronger stems that are better able to support the massive clusters of beautiful blooms it produces.
Nantucket Blue Hydrangeas have a compact growth habit, and will typically reach a max height and spread of 4 to 6 feet, and do best when planted in a rich, moderately moist, well-draining soil in partial shade. Because they bloom on old and new wood, Nantucket Blue Hydrangeas are very forgiving. This means they will bloom even if there is harsh winter damage that causes die back, and although they require very little pruning, if you do prune them in order to shape them or reduce their size, you don’t have to worry about removing blooms like you do with some other varieties of Hydrangea.
The pH level of your soil is the key to keeping Nantucket Blue Hydrangeas either pink or blue, depending on your preference. If you prefer pink, simply add lime to your soil to keep it at a neutral or alkaline level. If that rich blue is what you’re looking for, then add sulfur to the soil to lower the pH level and keep your soil acidic.