Swedish Ivy - Leaves are turning black!
A few weeks ago a purchased a Swedish Ivy (Plectranthus verticillatus) plant. It was hung by a south-ish facing window so was getting a few hours of direct sunlight daily (i have read differing opinions on the amount of light they require, some say no direct sunlight, others say that a few hours is required). I water it whenever i feel that the soil is getting too dry and also mist it when i remember.
Recently, it has developed black spots on the leaves, mainly on the new growth. Some leaves have turned completely black. I first noticed it, during that period of particularly hot weather we had a few weeks ago.
Has anyone experienced this before? Can anyone suggest what the cause might be?
I spoke to the lady at the shop where i bought the plant but she couldn't help. Online the suggestions of cause are typically broad.