Weednfeed works for broadleaf like dandelions.

If you want to save one type of plant in an area you need to know what you want to kill.

Another option is roundup sprayed directly at the base of the weed.

I give my yard waste to the trash can. Some companies are more sensative. Theyll charge if they find to much in the can. 2 gallons worth in a standard trash can is usually a safe bet. Better if you throw it in a contractors black trash bag