Marking out a design
I'm figuring out the layout of a new design and I want to paint it out onto the garden to help visualise the size of things. Specially designed grass paint all appears to wash off in a good rain and builder's marking out paint doesn't specify if it will kill plants. I currently have lawn all over and it's all going, so if it kills the lawn so be it, but I don't want residues to damage new planting. Does anyone have any great ideas how to mark it all out? I can't do it with a spade as the ground is super hard, I'm dealing with that issue with a rotivator and additives, but trying to make marks with a spade or edging tool or whatever is about 3 days' back breaking work. Any tools or techniques leaping to mind?