My husband gave me a lovely Dumbcane plant 31 years ago when we got married. It grew to unbelievable proportions! When we retired and moved to South Carolina 2 years ago, it began struggling so he bought a new pot & NEW SOIL at Home Depot. It's pretty much DOA... 😭 After 30+ years, my beautiful plant is gone! PLEASE! HELP??
What Is the Best Soil for My Dieffenbachia?
Certified GKH Gardening Expert
I think, initially, there was some nutrient deficiencies some shock due to the move, and that once the soil was changed it may have stayed a little too moist for too long. It seems to have a fungal infection at this point.
I would add dolomitic lime and wettable sulfur to the soil. This can help keep the pH leveled out, as well as keeping fungal infections at bay, respectively.
It seems that you have done well with the plant, since it has been around for so long. I just think that it was stressed very suddenly by many factors.
Follow my recommendations, and you can see a recovery as long as the infection has not progressed too far. It will not be fast, and the old growth will not recover, but the new growth should come out looking more normal.