Southern Iowa | I've been using Grazon Next HL with a splash of Liberate in an ATV sprayer on areas that I don't want to broadcast spray. Kills Canada, Must, and Bull thistles. If the must thistle get headed out before I get to them I keep a 5-gal bucket with me, pull all open blooms, and then spray..... burn heads later.
The must thistle seed seems to stay in the ground for a long time. If I doze an area or burn a brush pile you can be sure you'll have lots sprouting up for a year or two and have to keep after them. Once grass takes over again they can't compete very well and problem diminishes. |