Some upright, slender-stemmed orchids — such as vandas — eventually become too tall and floppy for theand should be cut down and left to grow on.
The most common method of propagating orchids which grow from pseudobulbs is by division of the pseudobulbs, making sure each division contains three. Alternatively, separate and pot up the back-bulbs. These are the old pseudobulbs that have lost their leaves and are found behind the new leafy bulbs.
Remove back-bulbs in autumn, at the end of the resting period, or when an overlarge plant is being divided and repotted in summer.