From the sources "Hydrangeas for American Gardens," by Michael A. Dirr (2004), and "Encyclopedia of Hydrangeas" C.J. and D.M. Van Geldere...Read Moren (2004 - Timber Press):
This rounded shrub grows to about 4' to 5' and puts on a brilliant autumn display. It has thin branches and the flowerheads are mid-sized to large, red to magenta florets with a distinct white star in the centers when young, and arranged in a single row around the yellowish-pink fertile flowers. Sepals are elongated and entire. Flowering time is from July to August. the form of the flowers, a rare one, is very interesting. This cultivar is considered the best of the Swiss lacecaps. Rotschwanz means "red start." Introduced by Federal Research Institute for Horticulture, Wadenswil, Switzerland, in 1987.
From the sources "Hydrangeas for American Gardens," by Michael A. Dirr (2004), and "Encyclopedia of Hydrangeas" C.J. and D.M. Van Geldere...Read More
Color remains very good even in neutral soil.