Dendrobiums are somewhat unusual orchids, with thick stems and plentiful flowers that just seem to keep coming. They are regarded as among the easier orchids to grow. By contrast, Oncidium orchids are much more delicate, with dainty stems and smaller flowers that are sometimes described as "dancing ladies" or "tiger orchids," because of their appearance. Oncidiums are considered somewhat more difficult to grow, but they tend to bloom repeatedly, while Dendrobiums often need a rest period before they rebloom.