This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
A charming rock plant, 3 in. high, having dense masses of pointed leaves and rose-coloured flowers. A. venustum is similar, but is about 6 in. high and has more glaucous foliage and larger flower spikes. A. acerosum and A. Kotschyi are other rather rare species. All kinds like warm sunny positions in sandy peat and loam, and may be increased from seeds, layers, and cuttings in cold frames.