If you have yellow rattle the plants should be coming up and very recognisable by now, albeit small. Pairs of fairly thin serrated-edge leaves in a cross shape (ie alternating pairs).
Planning a summer(*) cut this year for a change, as various perennials are starting to take over. I’ll cut round a few things I want to keep, but I don’t want too many of them!
(*) ok based on last year’s weather I’d better call it a July cut, summer or no!