13 minutes ago, TicTac said:Thanks @chromedome & @heidih
What did you top the cardboard with?
That is what I am most puzzled by at the moment...as I do not want to introduce weeds on top of the cardboard!
This more recent Los Angeles Times article with the cred from Arboretum might help https://www.latimes.com/lifestyle/story/2020-03-06/build-rich-beautiful-soil-layer-your-yard-cardboard-seriously