Q.Philodendron Bipinnafaditum
My philodendron has only 2 leaves at the top of a single 18 inch long stem; if I cut the stem down, will the plant grow back ?? The plant is 50 years old, I would use the top part, that I have cut off, to propagate a new plant !!

Certified GKH Gardening Expert
The cutting might make it, but it could kill both of them, due to the age of the plant. Keep in mind that the new plant would be the same age as the original, even after growing new roots. This will mean that it will come with the same problems as the aging tree. It will just be a little smaller.
These articles will offer some information on pruning and caring for the plant:
https://www.gardeningknowhow.com/houseplants/philodendron/pruning-philodendron-plants.htm
https://www.gardeningknowhow.com/houseplants/philodendron/repotting-tree-philodendrons.htm