In this May 17, 2012 photo, Richard Lowe poses atop a pile of mulch in Morrisville, Vt. Nursery owners and landscapers around Vermont have been getting big bills from the state recently for unpaid sales taxes on products like bark mulch and soil additives that many thought had an agricultural exemption from the 6 percent levy. Some are complaining that they were caught unaware of a change in the tax code made six years ago. ?You don?t just change the taxes and laws and not tell somebody,? said Lowe, owner of Green Mountain Landscaping in Morrisville, who is fighting $18,000 in bills for back taxes. (AP Photo/Toby Talbot)