Is there such a thing as Autumn lawn weed and feed but in a soluble form?
I use liquid autumn lawn feeds for my lawn, though havent seen a combined feed and weed in liquid form. Its always possible to add your own broad leaved weedkiller to the mix, at the right concentration for the coverage though. Was looking earlier this week and only saw the powdered form of combined product. My own choice is generally to keep things separate though, to treat things as and when they need it or to use a topical paint on weed killer for lawns. Hope this helps. Good luck!
