Sempervivum Mahogany (summer colour) Sempervivum Mahogany in March Sempervivum Mahogony Broad leaves with dark reddish brown tips. £2.60 Out of stock. Medium-sized rosettes with olive-green leaves tipped with mahogany (dark, reddish-brown). Looks very good once the clumps have developed. A good, reliable and popular variety. We have discovered that 'Mahogony' is the correct spelling although it's commonly mispelt with the usual spelling of mahogany (with an 'a'). Please don't look too closely at the plant label!