You are right on!
I love weeds! And the wildlife do as well. If you talk to some old timers...they will tell you how many pheasants, quail and partridge they had in their old weedy fields before chemicals.
If you shoot a rooster out of a weedy area...look in its crop and you will find all sorts of weeds seeds...especially pigweed...very small black seeds.
Unfortunately some programs (CRP for example) do not allow you to have weeds on the property. We all know that they are often too busy to police all of the CRP acres however. There are also state and county ordinances on weeds and noxious weeds. Your neighbor may also be your weed police.
Most states now allow "mid contract maintenance" of CRP such as light disking...they are know understanding the benefit of these weeds.
Definately high in protein, readily available and easy to establish...just work the ground and let it go.
However...food plots are fun and their is alot of satisfaction in the project. I think you will also find that deer are seasonally selective to certain foods. Your weeds will be targeted in the spring when they are young and green but may not be in the fall when they are steemy. Food plots can fill the other gaps in the food cycle in your overall management plan for your property or hunting spot.
Land DR
www.HabitatNOW.com