Hello! I've been growing a spearmint plant for about 6 months now. I grew my spearmint bush from a small few stems I bought from a shop. It's been doing great and has fully grown, however, I've noticed that it has recently developed small white spots on some of the leaves.
Also, it doesn't seem to be growing at all because the leaves are tiny! On top of that, the stems have turned a very dark brown/black colour, and scraggly, as if the plant is dying.
If anyone could give me some suggestions as to what might be the cause of all this, and any advice on how to recover from this, then I would be very grateful! Thanks a lot.
P.s. I water the plant regularly without over saturating the soil, and make sure it gets plenty of light.