Best season to divide? Does the foliage need to be cut back before digging? How many corms should one replant in order to have a strong stand ?
Dividing Dierama Pulcherrimum
Certified GKH Gardening Expert
It is less about the season that you can divide, and more about letting them multiply until their flowers start to slow. This will happen after about 5 years. Here is an article that will explain better: https://www.gardeningknowhow.com/ornamental/bulbs/wandflower/growing-dierama-wandflowers.htm