Hortensia flowers.

Botanical Name: Hydrangea macrophylla                                                 Common Name: Big leaf hydrangea, Hortensia, Lace-cap hydrangea, Florist's Hydrangea                                                                                                                     This is one of the most widely recognized species of hydrangeas. It boasts a plentiful number of cultivars. The species is divided into two groups: the Hortensias (or "mopheads") have globe-shaped flowers made up of large male flowers, and the Lacecaps have flattened flowerheads, with central, female blossoms ringed in larger, male blossoms. 

Noteworthy characteristics: Lacy, horizontal blossoms and large globes of flowers in rich colors.Care: Grow in moist, but well-drained soil, in sun to partial shade. Provide shelter from drying winds. These hydrangeas flower on the previous season's wood, and can be maintained by cutting back just to the first pair of buds beneath the old flower in spring. Propagation: Sow seed in a cold frame in spring; take softwood cuttings in early summer, hardwood cuttings in winterProblems: Gray mold, slugs, powdery mildew, rust, ringspot virus, leaf spots.