Repot Odontoglossums and Oncidiums at least every two years. As a general rule, repot them when the new shoot is 5 to 6 cm tall, or when new roots appear. All the old mix should be shaken off the roots and any dead roots should be removed. If dividing, keep the divisions in clumps of three to five bulbs. Medium to fine bark is preferred. The base of the new growth should be potted about 1 cm (no deeper), into fresh bark, then resume normal watering. Use Outeniqua Orchids Seedling mix for this group. For plants in pots of 15cm and greater, Outeniqua Orchids Cattleya Mix can be used.