You didn’t specify whether the manure was fresh or well rotted (about 18 months old). If it were me and you had some well rotted manure I would create and plant a few beds now and concentrate on doing those really well, rather than spread what may be a limited resource too thin and being disappointed. That way you’ll be delighted by your success and keen to do more. Should you have sufficient manure I would spread a thinish later on the rest of the patch and re-lay your tarps over it so the soil bugs can start improving your soil while the weeds are dying down. However, if you have lots – go for it!
A couple more things: test your manure first for the presence of aminopyralid, a persistent weedkiller. Nothing more soul destroying than having your lovely crops shrivelling after laying compost.
Secondly, you can make use of all those strimmed weeds in a compost heap if you have sufficient to get it hot enough to kill the seeds.
Good luck
Jan
