Konstantine and his crew are excellent to work with. He has a lot of field experience and knowledge of appropriate chemicals to use for specific plants. I contract them to do the majority of my weed treatments, icluding garlic mustard and knotweed, and they are very good at it. I am always amazed by how well they remember the many sites we treat and exactly where patches were the following year. Konstantine is also constantly adaptinng his methods to get the best results. The last two years of knotweed treatment have been very successful thanks to him and his crew.