There needs to be an attachment for the shop vac that allows you to cut a weed. This was you wouldn't need to bend over. It just needs to be a metal rectangle. One side you drag across the ground, the other attached to the shop vac.
By 'Idea' I mean something practical. This might be an improvement or something new but it should be practical. For example: "We should all have jet packs." While a great idea, it's not very practical. If I had an idea on how to improve the thrust/weight ratio, then that would be a practical idea. That being the only real problem that would need to be solved for jet packs.