Delicate clusters of light blue flowers create a splash against the dense green foliage. The glossy leaves have a red-purple hue in late summer and fall. Compact lacecap works well in the garden and containers. Lacecap hydreangeas also fit nicely in woodland garden settings. Hydrangea macrophylla serrata 'Blue Billow'
Botanical NameHydrangea macrophylla var. serrata 'Blue Billow'
Sun ExposureFull Sun, Partial Shade
State RestrictionsAE AK GU HI PR
Flowering DateEarly summer to fall
Planting InstructionsSet plant at same level it is growing at in the container. Firm soil and water thoroughly.
Winter CareMulch in northern zones.
Flower Formglobose flower clusters
Foliage TypeSerrate obovate to elliptic dark green leaves.
Soil RequirementWell drained, moist soil is preferred. Flower color will change if soil is treated.
PruningPlant need little pruning. If pruning is needed prune immediately after flowering by cutting back flowering stems to the healthy buds. In late winter/early spring prune out weak or winter-damaged stems.
Unique CharactersticsDigging Dog: This compact lacecap Hydrangea deserves center stage, where its broad, light blue flowers and dense green foliage can create a colorful splash. Handsome and verdant, the glossy leaves, which are narrower than those of the species, display a tasty reddish plum hue in late summer and fall. A drift of 'Blue Billow' is irresistible next to Philadelphus 'Innocence', while golden-leafed Hakonechloa skirts below.