Advice Needed - Salvia Problem - Yellow Leaves & Spotted Flowers
I have two Slavias growing in clay pots, about years old. They were fertilised with Growchar 2 months ago and have now started to appear sick. Last year I fertilised them with Growchar they were happy all summer long. The overall deep green colour from spring has turned into a yellow-ish one and the leaves are turning yellow from the bottom of the plant and dropping. One of them has red veins on the yellow leaves, the other one is just yellow. I thought it might be a nutritional deficiency a fed them a "slow-release source of primary macro nutrients (NPK 3:2:3)" two days ago. Today they developed spots on the flowers. Can somebody please advise me on what is wrong with them and what else I can do to save them?