Are you laying sod? There's a very good chance that if it is good, thick healthy sod, it will smother all the weeds. The only exception is if your lawn is infected with Florida Betony. I find that Weed-B-Gon is more effective that Round-Up on that stuff. And you do need to spray so that the roots will die before you lay sod. I think Betony will grow up through concrete!! It's as bad as kudzu if it likes a spot. Frog

The soil I garden in is sand, Lake Michigan beach sand, and adding any kind of soil, unless in extremely large amounts, is a waste of money since what ever soil you add will go in and attempt to fill in the pore spaces between the sand particles. Lots of organic matter, compost, shredded leaves, etc., is all that sand needs to fill in those pore spaces so both nutrients and moisture can be retained in that soil. I have seen people around here spend large sums of money on "topsoil" or "garden soil" to add to their sand only to see that washed in with little benefit long term. "Topsoil" is nothing more than the top 4 to 6 inches of soil from someplace and may be nothing more that what you already have with a bit more organic matter in it.

Thanks for Weed Dragon advice ! It certainly is a lot of fun to burn the weeds up and it certainly works much faster than Roundup :) I will carefully consider if I want to go this route for 2 reasons: 1. Fire safety, it is very dry here in CO in summer so this might be dengerous to use. 2. Just like Roundup this method is post-emergent control and due to the size of the area to be controlled still going to present with same issue of being time consuming. I've been looking around some other pre-emergent control options and found a product called Preen (available from Amazon, Home Depot, Walmart, etc) -- this product is safe to use around trees and provides up to 3 months protection. So I think I will probably end-up with some combination of pre-emergent control (Preen, CGM) + Roundup/Weed Dragon for post emergent control -- even if I can get 50% weed reduction with Preen this will make post-emergent control so much easier. Thanks everybody for your help !! Please let me know if you have any other suggestion. Davie.

try a sod cutter. PL