It sounds like you are describing a condition called pythium (sp). It's
caused (usually) by overwatering directly in the center of the plant. It it
were me, I would get a better watering can, enabling better control in the
amount and direction of water flow. Then when watering tilt the pot
slightly so you flood the entire surface of soil, let it drain, don't keep
water in the saucer. Repeat when soil dry. This may be a problem you've
inherited from the grower. Pothos are famous for it. The next one you buy
inspect the center of plant and soil carefully befor buying. If it is
present the soil next to the roots will have a slight grey cast. If the
grower used osmocote to fertilize. The osmocote balls will definitely be
grey colored.
HTH Zhanataya
zone 9 central Florida
Thanks
RSeshan
Interesting.... I took it to mean bright shade as from high branches.
...elizabeth
http://hometown.aol.com/lotts2c/life1/index.htm
Lovely color. Most noticable after Bombay and cocktail onion.
Zhan