unhappy firecracker vine

Hi,

My small firecracker vine (Manettia inflata) has developed black edges on most of the leaves. Some of the leaves are more black than green. I can't figure out what's causing it -- can anyone shed some light on this for me?

Many thanks,
Beth
Salem OR
USDA Zone 8

How about a picture to help us.

Sure, although I'm not very good with this el cheapo digital camera . . . :-/

FWIW, I called the vendor yesterday. His thought was that it was lack of humidity. As per his suggestion, I misted the plant and put it in my greenhouse. This morning it was worse, so I took it out of the greenhouse and just put it in the shade outside.

On the off chance someone else runs into this problem, I guess I'll answer my own question . . . the cause of the black-edged leaves now appears to have been too much sun. I've left the plant in the shade since my last post here, and the new growth looks fine.