Hi there. No matter what you put in a run with chickens you’ll need a cage around it for protection and some bricks or large rocks near the base so they don’t bathe under it.
That green wire fencing works great for making cages. Keeps a nice round shape and reusable. You’ll need to pin it down and your flocks can pick at the greens through the bars. Tomato cages wrapped in chicken wire also work great.
Grass frames are also useful.. make a square or rectangle with 2x4s with the 2” side as top and bottom. Attach HWC and plant grass seed. They can nip off the ends but not dig it all up. Or grow it, move the frame to a new spot so they can dig up the old one and start again in a new spot.
Be sure to check for toxicity before putting anything in for them to munch.
I don’t have pics on my phone of the cages, will post some later.