I've had my oxblood oxalis for a month, it was flowering when I got it and flowers are still going. It's on a sunny windowledge. Recently I noticed that an orange mould is growing on the underside of many of the leaves. The plant seems okayish though. What is this and what can I do?

get it away fom the ledge... it'll fry being too close to the window.... remember burning ants with a magnifing glass???.... the same applies here! cut back water to once weekly! bayeradvanced makes some good stuff for ur problem, go check it out!

Sounds like it's geting too much water and the plant has rust, a fungal disease. Water only when the surface is dry and never let water sit in the saucer. You can use a mild detergent/water solution to wipe the rust off the leaves. Be gentle--if it all doesn't come off the reduced watering schedule should help.