Can you compost weeds, even if they’ve gone to seed? The answer is yes, but there’s a few things to consider:
1) If you have a compost bin that’s 1 cubic yard or greater, your pile should have no issues heating up to the temperatures needed to kill weed seeds (131F for 3 days). I add to one bin for a year before letting it sit for a year…plenty of time.
2) If you’re working with a smaller compost system such as a trash can shown in this video, it will not be able to generate the necessary heat to kill weed seeds.
Try letting them sit for a few days to dry out. Once they’re dry, add all the thin brown stuff to your compost pile. Put your thicker stems off to the side for now.
Weeds are organic material, therefore they will compost- the key is just knowing how to add them, depending on your setup.