Sooby, I think you have solved my mystery! It's the coffee grounds! 1000% it is the culprit. I never know of the allelopathic effect. I was so exasperated for the past 11 months on why the plants I spent a small fortune on since I moved house and country were such disappointments this past year. I put it down to the different climate, possibly poor soil or quality of plants and maybe to my formerly green thumb suddenly turning black. I always composted before. This is a lightbulb moment for me. Thank you.
