Cinnabar Moths

Hi Folks,  long time no post!

  I have a problem and hope someone can help.  We've left a patch of grass to grow in our front garden in order to create a small 'meadow'.  I threw seed there ages ago but there is very little variety of wildflowers, being mostly rather straggly yellow things that look like skinny dandelions, about a foot high, that I can't remember the name of (they're very pretty en masse), some clover, daisies and ragwort.  I would like to have a few poppies, cornflowers and oxeye daisies too and had planned to strim the area now that the flowers have gone to seed, then go over it with a cultivator to 'rough up' the ground before planting new seed.  The problem is that we have cinnabar moth caterpillars on the ragwort so I'm not able to strim it yet, and as they pupate in or on the ground, this kind of scuppers my plans to rough it up.  What should I do?  Go ahead with my plan and possibly sacrifice some of the moths or just stick with what I've got?  On thinking about it, for some reason the ragwort is quite short so I could strim above it and try not to strim the caterpillars, but it's the cultivator that really worries me.

  Any ideas gratefully accepted - especially as cinnabar moths are among my favourites!