Hi Tracy,

Research on using burdock for weed control has focused on extracts from the leaves and roots, so I’m not sure just using leaves would work. Here’s the research citation I found:

https://pubmed.ncbi.nlm.nih.gov/31271331/

 Burdock can be composted but unless you want more burdock make sure no seeds or roots are put in the compost. I can’t find anything saying compost with burdock in it has any more weed control properties than ordinary compost.

Hope this helps. Thanks.