‘Mousmee’ hydrangea is cultivated selection of the bigleaf hydrangea, which is a woody shrub native to Japan that grows to five feet high by five feet wide or more forming a large clump. It blooms from late spring through midsummer and has large, medium-to-dark green leaves that occasionally will turn yellow in the fall. Bigleaf hydrangea performs best in partial shade and evenly moist, well-drained acidic to neutral soil. Pests and diseases are rarely a significant problem for this species in the Washington, DC metro area. Lacecap-type hydrangeas, like ‘Mousmee’, have flattened heads of sterile, showy outer florets and fertile inner flowers; this is different from mophead-types, which have rounded clusters of mostly-sterile flowers. This selection has large pink outer flowers and very small inner flowers and both fade to a bluish-pink. ‘Mousmee’ is hardy in USDA zones 6 to 9. This and other lacecap varieties are typically available at nurseries owing to the popularity of hydrangeas for shrub borders, foundation plantings, and shade gardens. You can see ‘Mousmee’ hydrangea growing at the Garden Clubs of America (GCA) Circle within the Asian Collections.