Q.Why do I have no plumes on pampas grass?
Could it be that I need a male plant with the female? Four years ago, I bought 2 plants with plumes and they have not plumed yet. Very few blogs specify this reason. They all point to other reasons.
Certified GKH Gardening Expert
This article should help: https://www.gardeningknowhow.com/ornamental/foliage/ornamental-grass/no-plumes-on-ornamental-grass.htm