Hydrangea Double Dutch Gouda The Hydrangea Double Dutch Gouda produces masses of beautiful creamy-white double-flower heads, densely packed out so very eye-catching. Double Dutch Gouda is an ideal plant for patios, cottage gardens, cut flower gardens, woodland gardens or to be displayed as a specimen plant. Height: Up to 120cm (47?) when fully established Spread: Up to 120cm (47?). Caring for Hydrangeas Like all Hydrangeas the intensity of the colour is dependent on the soil pH. Hydrangeas like to be grown in rich moist soil and to give them the best start, stir in rotted manure or garden compost thoroughly. Alternatively, they can be planted up in containers in ericaceous compost.