I believe the chlorophylL doens't actually break-down but rather
is re-absorbed into the stem and, more importantly, the roots for
safe keeping over the winter. Chlorophyll, I would think, is
fairly expensive to make so I doubt the plants could possibly
come back in the spring without a good supply in store. Anyway,
no CPs are deciduous, though leaves may died from freezing/drying,
they don't pull back the chorophyll as you can still see plenty green.
I think some plants do pull out the chlorophyll from their dying
leaves (Sarracenia, Nepenthes), as before browning into death, they
become very yellow, with hardly any green at all. Comments?
Dave Evans