Mine in the baskets aren.t doing very well either, the leaves are all yellow, and I do water and feed them and take the dead heads off, what there is are quite pretty, but not the display Richard Jackson raved about, and to be honest I cant be bothered to transfer them in to other containers, just wont buy anymore.
They do have to constantly untangled, but I think thats how sweet peas are supposed to grow and up a frame or something, but not all huddled together in asmall basket, that why they are getting tangled
But the baskets are pretty so will save them for next year