posted 3 years ago
Not sure this will help. I've got rhubarb growing where I can't mow and grasses are naturally returning from when I mulched and planted the area years ago. We want the rhubarb to do well, so when I pick it, I intentionally lay the large leaves I remove down flat around the edge of the plant as a mulch. Rhubarb's a heavy feeder, so I also put leafy mulch around it in the winter, have a Goumi bush near-by, and give it the "P" treatment occasionally.
Do you mean that you planted rhubarb and now want pasture to return? Or did something "rhubarb-like" show up in your pasture? If so, have you confirmed it's rhubarb? We have burdock here (root is good medicinally and helps break up clay and chickens will eat some of the leaves, but not their favorite). It has similarities to rhubarb, but is definitely a different plant - hairier for one, paler stock colour, and yes, a more upright growth pattern. Its seed pods are what inspired velcro, and can be quite annoying, so I'm trying not to let too much go to seed. However, as a mulch, compost additive, clay buster, and soil builder, I'm not prepared to eliminate it at the moment. People with sheep do!
ETA - do you want me to take pictures of each and post them?