rhubarb

Question

Is there anything you can use to spray the grass around rhubarb plants that will not kill the rhubarb?

Answer 1

The safest way would be to remove the grass manually and then you can mulch the plants to keep weeds and grass down.
These links may help you.

https://www.gardeningknowhow.com/plant-problems/weeds/how-to-kill-grass-naturally-kill-unwanted-grass-in-your-yard.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-weed-control.htm