About Diana Hamilton Expertise I can answer questions related to flowering and non-flowering house plants, and herbs. I do not know very much about cactus, orchids and bonsai
Experience For 20 years I owned a florist where I sold cut flowers and all types of house plants and accessories and gave advice to my customers.
Publications I have not had any writings published but I have presented gardening programmes on television, showing viewers how to care for their plants, giving them ideas on suitable plants, discussed problems with experts in different fields and given practical demonstrations on growing seeds, planting tubs and hanging baskets, watering, feeding, pruning etc.
Education/Credentials I am completely self-taught
Awards and Honors I have exhibited plants and flower arrangements in many Flower Shows winning many prizes.
Question I have been growing mandavilla vines on my deck every summer for the last several years and have beautiful growth every year, however this year the leaves at the bottom of the plant are turning yellow with brown spots. The rest of the plant looks healthy but this has been going on for several weeks now. Any ideas?
Answer Dear Beth,
Since you have been successfully growing your plants for several years and are, presumably, treating them just the same as always, I would imagine that your plants have either been attacked by insects or are suffering from a disease. Investigate the soil to see if you can see any insects.
I would suggest you take a couple of leaves to your garden centre and see if they can identify the problem after which they will be able to recommend an insecticide or fungicide.
Do you perhaps have a cat or visiting cats which could have been using it instead of their litter tray?
Alternatively could this just be old leaves dying off?
