Orchid Humidity
Thursday, July 31st, 2008Cymbidium devonianum with fat, healthy roots growing straight down through the compost, an obvious sign of a sweet compost. Note that the roots are all round the edge of the compost ball. This particular plant has been repotted for six months, and this is a young root system growing vigorously and capable of taking up maximum moisture. Such a root system should not be allowed to dry out.
The roots on paphiopedilums are quite distinctive, always thick, hairy and brown in appearance. This makes it less obvious to tell live roots from dead ones, but the outer core will easily peel away on any dead roots. Although some paphiopedilums grow epiphytically or lithophytically, they do not produce aerial roots in cultivation, but keep their roots firmly in their pots.
Their own weight will soon cause them to assume a pendent habit, when they become entangled with the canes, often adhering to and growing along their length. These are annual roots, which serve the plant for one season only. They cease growing as the long caned pseudobulbs reach maturity, to die naturally at the same time as the leaves are shed and the plant prepares for its dormant period.