|Green Light makes a product to kill weeds in the flower bed called AMAZE. Sounds to good to be true.
|Amaze by Green Light is actually an efficient weed control product. It contains benefin (a pre-emergent herbicide which stops weed seeds from germinating) + oryzalin which is a systemic herbicide. It can take several weeks to work, but it does work. I think it's worth a try in your garden. Be sure to apply according to label directions. Another product with similar results is Over The Top by Fertilome. You might want to compare the labels to see if the application rates and/or cautions are the same. Best wishes with your weed-free perennial beds!|