This is my first year doing apps. and I treat approx. 350,000 sq ft. Most of my lawns have very few weeds as I am approaching my 2nd app. for mid to late May. Lesco is trying to sell me their Weed and Feed w/ momentum polyvex which is about twice as expensive as 24-5-11. I use a backpack sprayer to spot treat with Momentum which is a pain in the ass on a few new lawns i just picked up that have a lot of weeds. My question is, do I need to use the Weed and Feed to play it safe or should I stick with the 24-5-11 on the lawns with minor weeds and only use the W and F on the new ones with many weeds?