Tuff Stuff Ah-Ha® Reblooming Mountain Hydrangea (Hydrangea serrata 'SMNHSDD') sets the benchmark for reliable reblooming performance, offering continuous flowering from summer through frost. Developed specifically to excel in colder climates, its abundant, waterlily-like double florets emerge in captivating shades of pink or blue, determined by soil pH. Exceptional cold-hardiness ensures consistent blooming even in challenging USDA zones 5 and 6. Compact and highly adaptable, this hydrangea appeals strongly to landscapers, garden centers, and growers who require vigorous plants with superior ornamental value and unmatched bloom consistency.