Just a thought but reminds me of when in grade school we put cellary in
dyed water. The stems sucks the food coloring into it changing the
coloring of it. Just from the photo how the color is in the middle of
the leaves made me thing this. But if someone is growing these with this
leaf would be nice to see a well grown plant. Not to mention grow some.
These have been doing well here in KY next to the foundation of the
house and greenhouses.