Free Miracle Gro Expand n Gro Sample March 9, 2012 at 5:48 pm By coupongeek You can sign-up for a Free Sample of Miracle Gro Expand n Gro. Thanks, The Freebie Blogger! Offer valid through 5/1/12 or while supplies last. I just can’t wait for the weather to be warm enough to get back into the garden again. How about you?