There are two main growth types in orchids Sympodial (multiple stem) and the Monopodial (single stem). In order to grow orchids successfully, itís important to understand each type of growth so that you can treat them correctly.
The second growth type is monopodial. In this type of growth pattern there is one main stem which grows indefinitely from the center of the plant. Normally, the stem grows straight up and aerial roots sprout from where the stem and leaves meet. The plant will lose its leaves from the ground up, continually growing new leaves from the tip and making new roots along the stem.
Examples of monopodial orchids are Phalaenopsis and Vanda. The foliage is generally thick and leathery and grows alternately on the stem. Inflorescences rise from the stem at the base in the case of Phalaenopsis or from between leaves in the case of Vanda.