What: Throughout the summer, Hydrangea “Preziosa” provides a spectacular floral show. Small, rounded mophead flowers are borne in a profusion of soft shades of pale-lavender, blue or pink. As the season progresses, the colors of the flowers intensify to rich rose, royal purple and shades of burgundy. The leaves also transform: early summer’s bright green foliage becomes suffused in shades of burgundy-red by early fall. Mophead hydrangea is an excellent choice for late-season garden color. It provides a medley of colors but not in an overpowering fashion.
Where: This hydrangea grows best in light to open shade. A location protected from hot sun will keep the foliage and flowers from prematurely fading or scorching. A rich and moist to well-drained soil produces the best growth and flowering. Hydrangeas are not drought tolerant and will grow and flower more prolifically with regular summer watering.
Size: “Preziosa” will grow to be 5 feet tall and 5 feet wide when mature.
Care: The typically acidic soils of the Pacific Northwest will cause the variable flowers to bloom with purple and blue tones. For pink flowers, add lime to raise the pH and sweeten the soil. Have a soil test done to determine the amount of lime. Changing the color can often take a few years to accomplish, with more than one application of lime. Remove a few old twiggy branches to the ground yearly or prune lightly to improve the overall shape. Heavy pruning can ruin the flowering for the following year. Consult an experienced pruner or take local classes before attempting substantial pruning.
— Richie Steffen, Great Plant Pick
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