Shrubs, trees and canning supplies
September "is a great time to be going into your nurseries and looking for good prices on shrubs and trees," Smith says. "I've seen sales as deep as 50%."
September sales on plants especially make sense this year because many homeowners lost vegetation to the summer heat.
Another garden-related item where you'll score good buys on Labor Day and beyond is canning supplies. While a lot of home gardeners have wrapped it up for the year, farmers markets "are going to be full of fresh vegetables well into November," Smith says.
But a lot of retailers won't leave pressure cookers, jars and other products on the shelves past August, says Smith. As a result, you could save as much as 50% on those supplies in September.