And speaking of new garden beds, and the whole lasagna method. I read that all you need to do is whack the grass as low as you can get it, cover it with newspaper, or cardboard or weed cloth, then dump compost, soil or whatever growing medium on top. This may sound like a stupid question, but for flowers (as opposed to edibles) would it be a good/bad idea to hit that grass with some Grass Getter or something similar before adding the other layers? We have some industrial strength green vermin in this area, so I'm sort of thinking belt and suspenders.
And can you plant immediately if you're just putting soil on top of the cardboard/weed barrier layer? As opposed to composting?