Each orchid, exactly like all other plants have roots, leaves and stems. By the nature of the growth of orchids are divided into two groups. Some of them, with monopodial growth form, during the lifetime of developing a single main shoot, infinitely increasing its height, usually vertical. In the growing area there are fresh leaves are placed bilaterally, whereas in the old lower lobe of the stem gradually disappear. Flowers, or edenichnye collected in the inflorescence, are all the time from the side, in the leaf axils, and in any case – at the top of the shoot.
Monopodial orchids roots of the most frequently occur at the base of the stem or in the lower zone. Group monopodial Orchid relatively small. Typical representatives are the Phalaenopsis (Phalaenopsis), aerangisy (Aerangis), Vanda (Vanda) and some others. The second, much larger group of orchids with sympodial growth overlooking the main axis grows mainly in the horizontal direction and a bizarre system of annual stems from a slight increase, in which any fresh shoot reaches its maximum velechin for a season, and thereafter ceases to increase as a result of either the apical inflorescence, or death of apical buds, and the resumption of the kidney, which is near its base, the next year developing a fresh one-year escape. Annual shoots many sympodial orchids greatly thickened, even swollen and look like green onions or tubers. They are called pseudobulbs, or, more simply, bulb, not often – tuberidiyami. Bulbs are storage organs, they stored reserves of nutrients and water, allowing orchid survive long periods of drought.