Genus Hydrangea Species macrophylla Cultivar 'PIIHN-11' Patent 25566 Common Name Endless Summer® Bloomstruck®Hydrangea Zone 4 to 9 Habit mounded habit. Moderate growth rate. Height 3 to 4 Feet Spread 4 to 5 Feet Foliage Dark green foliage, thick leaves. Striking red stems. Deciduous. Flower depending on soil pH. Blooms June-October., Large, round blue or pink flowers Flower Color Blue/Pink Culture Partial shade. Categories: Deciduous Shrub Endless Summer® Hydrangea Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Tumblr (Opens in new window) Description Photo courtesy of Bailey Nurseries.