The bush began to put out long streamers or vines but no roses. I've used rose food without results. I imagine your rose was broken below the graft, and what you're seeing is growth from the rootstock. You've apparently lost the top part of the plant that gave you the desired blooms. What is now growing from the rootstock may eventually bloom, but it will not be the same flower you loved.
Good drainage is important.
Just sprinkle the seeds and gently press. This poppy blooms in late spring and early summer here. It's considered a hardy annual, so collect seeds again for future flowers. Looking at the foliage you sent, it appears your plants have lacebugs, tiny insects that drink the sap from the undersides of the leaves, leaving the topsides with a speckled or blotched appearance. The damage is similar to that done by spider mites, but the dark spots on the leaf undersides look like the excrement lacebugs typically leave.