"Black Tree" Wide leaves tipped purple in flat rosettes topping thick erect trunks; golden blossoms in impressive pyramidal clusters often appear midwinter. This form has very deep maroon "Black Tree" leaves with shiny flat leaved rosettes reaching their most beautiful level mid winter--tends to rest in the heat of mid summer as its Canary Islands origins dictate, the tight rosettes of leaves incurving into guppy mouths, at which point you need to cut back severely on watering to avoid root rot. Very popular currently for combining with other "black" plants in containerized avant gardening.
Some of you grow only indoors, some only in terrariums; many of you have hobby greenhouses; while a growing number of customers live in subtropical or tropical areas of the world. These brief codes are an attempt to suggest whether or not a particular plant will do well in your particular conditions.
If an entry has the cluster HP CGH, this means normal house plant culture will be successful if the plant is given a cool CGH moist location; however if the entry has the cluster CGH HP, you would interpret this to suggest that while Cool Greenhouse conditions are needed for total success with this plant, House Plant conditions will be adequate, while not ideal. If the cluster is HH CGH you would interpret this to mean that while in Zone 8 or below this will be winter hardy outdoor, further north it will need considerable mulch, a cold frame, or a Cool Greenhouse to thrive. And so on.×