You can also watch the video clip from Gardeners' World. Cymbidiums and many other orchids produce pseudobulbs from which new growth emerges. The pseudobulbs act as storage organs for water and nutrients, and can help the plant survive drought. Phalaenopsis and other species that do not produce pseudobulbs can also be divided, but it is easier if you can have the pseudobulbs to guide you. When to divide and repot If your orchid is looking too big for its pot and you can spot three or more pseudobulbs, it may be a good idea to repot, but always repot at the beginning of a new growth cycle.
Some growers say never to divide with less than four pseudobulbs because it can inhibit flowering.
Growth cycles can vary even within one species, so you may wish to consult a specialist book or garden centre. For Cymbidiums the best time is every two years in the spring, after flowering. Preparing the compost Orchids do not like ordinary flower compost . You can buy ready-made orchid compost or make your own, and if you have the time you can make specialised mixes for particular plants. A healthy helping of perlite.