Cotyledon orbiculata 'Silver Waves'
It is always the way, just when you have a batch of plants ready for sale and and they are looking fantastic something happens to make them worthless. Silver foliage plants have adapted to grow in climates where the conditions tend to be hot and dry with little humidity in the atmosphere for most of the year, so when the conditions are not to their liking they firstly develop unappealing black spots on the leaves and then the stems start to collapse having rotted in the middle. Not much can be done other than salvage a few tip cuttings which have been unaffected by the rot and start again. Cooler weather and winter temperature tend to suit this plant better and they love a spot on the coast in the full blast of salt wind and/or growing in sandy soil.