To determine whether your orchid needs to be repotted, evaluate the root system, not the foliage. Even good chunky orchid media breaks down over time, which can deny life-giving air circulation to plant roots. If the roots look brown or the planting material resembles garden soil in its density, it’s time to repot. If more than one or two roots are creeping over the edge of the pot, it may be time to repot, or even to divide the orchid plant to maintain blooming vigor.  Vanda orchids bloom two to three times a year, with each bloom cycle lasting up to six weeks. In contrast, the popular cattleya and cymbidium orchids only bloom once a year, but their ease of care make them popular choices for novice growers.