Memorial Day weekend is going to be a good time to buy needed garden goods. It's also an Energy Star Sales Tax Holiday. Applicable dates are May 27 -29, 2017.
This link pretty much outlines what qualifies.
http://kxan.com/2017/05/24/tak...
A link regarding ENERGY STAR Sales Tax Holiday is interesting in that it points out that there are other charges that affect the sales prices.
'Delivery, shipping, handling, and transportation charges by the seller are part of the item’s sales price. Charges for installing free-standing items are also part of the item’s sales price. If the item you buy is not taxable, then these charges are not taxable.'
https://comptroller.texas.gov/...