Hi everyone,
I have just noticed all my tomato plants, cucumbers, melons and aubergine are all starting to turn yellow on the leaves. All the plants are in grow bags except the cherry toms which are in tomato pots. I water in the evenings and at the moment watering every other day. I water using rain water from a butt attached to the greenhouse gutter. I have peppers but at the moment they don't seem affected. Any ideas anyone ?