Most years my milkweed (asclepsias tuberosa) blooms all summer then goes to seed by now. This is the red/gold one that is so common. I usually have plenty of seed pods to save or scatter. This year got blooms but not a single plant has gone to seed. Didn't get any caterpillers either. Usually I plant my own seed, but late last spring I purchased a couple of gallon plants. But even the plants that reseeded have not gone to seed yet. Has anyone noticed this?