I have two philodendron verrucosums that were quite healthy but since last autumn or so one of them stopped growing new leaves. It continued to grow taller at quite a steady rate but new leaves will die in cataphylls before it unfurl. Since this spring the other one is starting to do the same, and I lost bout 8 leaves in total like this. One of them ended up growing new branches and finally pushed out a new leaf, but the new growth on the main branch died again. Anyone know what’s going on here and what I can do to help it please? Thanks!