Wet newspapers and put layers around the plants overlapping as you go; cover with mulch and forget about weeds. Weeds will get through some gardening plastic; they will not get through wet newspapers. (this really works!)
3 gallons for around $4.00 Worked better than Round Up killed the weeds/stray grass on first application. One gallon of APPLE CIDER VINEGAR, 1/2 c table salt, 1 tsp Dawn. Mix and pour into a smaller spray bottle.