Silver Frost: 24-36" plant height, a hybrid cross of Lavendula angustifolia and Lavendula lanata ,12-18" stems, beautiful silver felted foliage, and fat, dark purple flowers. The white woolly color of the leaves makes Silver Frost a beautiful contrast in the garden. One of the oldest plants at Purple Haze is a gorgeous Silver Frost specimen that grows at the corner of Jose's shed. 20+ years and still going strong, it is absolutely stunning when in full bloom.