A few of my irises planted last summer have risen. It looks as though they are elevated in a 3" dirt mound around the surrounding soil. The rhizomes are exposed a little more than I would think proper and I can see roots on a couple. My question is how to deal with this issue. Should I:

1. Leave things as they are

2. Pile some more dirt on the rhizomes

3. Carefully dig around and sink the rhizomes farther down

Thanks for your replies.