I have 3 oriental poppies, the leaves do go to look very raggy and the whole plant goes floppy but the flowers unfurl so beautifully it's worth it. I support mine early on, although they are meant to be a bit floppy and I grow other flowers around them, such as hardy geraniums to cover the tatty foliage. When they finish flowering I chop them more or less to the ground and they produce nice tidy new leaves.