I live in Dorset too, and I reckon that's far too little, especially only twice a week. I water every day for young plants and every other day for mature plants if there's been no rain, and water until it starts dripping out the bottom of the container. I think a box that size will need a couple of litres of water at least.
I live in Dorset too, and I reckon that's far too little, especially only twice a week. I water every day for young plants and every other day for mature plants if there's been no rain, and water until it starts dripping out the bottom of the container. I think a box that size will need a couple of litres of water at least.