Hydrangea m L.D. Rhythmic blue usppaf the flowers of this latest Let's dance reblooming hydrangea are truly amazing. The florets have a distinctive geometric shape, and are closely packed into full, richly colored mop head flowers. The reliable blooms are held up on sturdy stems, and a tidy habit and good wilt-resistance add to its appeal. The real show, however, is its easy shift from pink to rich amethyst-blue flowers by adjusting the soil pH. It has the richest, most vibrant blue seen on a hydrangea. you'll love it along the foundation or in any half to full day sun garden. grow tips prefers moist, well-drained soils. May be trimmed after early summer flowering. Soil pH will affect flower color. Add aluminum sulfate to the soil to encourage blue flower color.