You folks must not have squirrels 🐿️ up there. Here in TX they dig them up. Even had to quit putting them in pots. Turn them over and leave the dirt behind for you to clean up.
Squirrels aren’t a problem for me...but then we raise noisy hunting dogs, and we have two ‘Patrol Cats’ that keep things in line out in the garden and house yard. ;)
Wire Mesh Round Waste Basket (3 Pack), Set of 3
Picture of Wire Mesh Wastebasket
Set these over your planting and place a brick on it. (Someone...maybe Bon of Babble?) made this suggestion last spring.
You can find them a lot cheaper; I got a number of these at the dollar store for $1.25 each.
Get a some mesh wire and see if that would help keep ‘em out.