*UPDATE* 3/19/15. Costco has the Preen 18.75 lb Weed Preventer For Flowers & Garden on sale for $18.69 (after manufacturer’s instant rebate), now through March 29, 2015. That is $4.30 off Costco’s regular price of $22.99. The Preen Weed Preventer can be used around flowers, vegetables, trees and shrubs to prevent new weeds for 3 months. This 18.75 pound container covers 3,000 square feet. To use, first remove existing weeds…
