On May 11 & May 12, you can get a free plant from Lowe's in honor of Mother's Day! However, you must register for this ahead of time! Create or login to your MyLowe's Rewards account, then look for this box on your dashboard and click the blue Reserve button to select your local store and reserve a pickup time.
If you're having trouble finding the box to register, click this link and then look for this image: