Endless summer hydrangeas is a collection of hydrangea macrophylla perennial shrubs that have the unique ability to re-bloom throughout the spring and summer months, giving more color and visual appeal to your garden for a longer period of time. Hydrangea bushes are easy to grow, cold hardy, and salt tolerant,. No other hydrangea compares to endless summer, the worlds first hydrangea bred to bloom all season long, season after season. Worth the hype? Claim 1 - you get 6 months of continual blooms! Endless summer blooms from early summer to the first frost. Milder climates should see pretty consistent blooms until around thanksgiving, except for a brief week or two in august when they may get a little sparse. The endless summer hydrangea is slow to break dormancy, and will not start to grow until the ground has sufficiently warmed up.