Two of my Drosophyllum have recently died One was about three years old and grown under glass. The other was 18 months old and always outside. Both had flowered like mad recently, with flower stems outnumbering the actual leaves. When I cut the woody stems back they were dry and hollow, as if the effort of flowering drained the plants resources. A third plant which flowered briefly earlier this summer with a couple of flower stems is looking fine with loads of new growth. Is it likely that it was simply the effort of supporting all these flowers and the seed production that followed that killed the plants?
This photo was taken in May when it just had a couple or so flower stems. It carried on growing happily till about a month or so ago when loads more flower stalks appeared. And all the leaves dried up! As have the flower stems now.