Quote by sorts
Are the plants getting scourched by the sun? That would turn them yellow. When you water them in the morning make sure you do not get water on the plants themselves as this will increase the scourching. Try watering them in the evening when the sun starts to go down.
Oh ta .. I do tend to slosh it about a bit
DD
you could also try something called "broadleaf p4" its a gelling agent mix it in with compost when you water it absorbs the water & it wont evaporate the plants have to suck the water out which means you dont need to water so often in summer

Don't they get tired of sucking all the time? :twisted: