The client has Dymondia Margaretae planted between walkway stepping stones. It has made a very durable and attractive mat without getting overgrown like grass. There is a 'weed' (see attached photo) that is starting to take over the Dymondia (see attached photo). It starts in a small area and ends up making a complete mat. Manual removal is proving to be very labor intensive as it has not been possible to effectively remove the root system so it continues to gain ground. I plan to try a herbicide and apply it with a Q-Tip ONLY to the weed leaf(as I know that the Dymondia will die if I use the herbicides that I have on hand - see below - and spray it on). This will be done each week until the weed is under control (it may seem that this is labor intensive but it is far easier to do than manual weed removal). CAN YOU ID THE WEED? CAN YOU RECOMMEND A HERBICIDE THAT I CAN APPLY TO A TRIAL AREA ONLY ON LEAVES VIA Q-TIP TO SEE IF IT WILL WORK? THANKS. Herbicides that I have on hand include (I can buy others if necessary): Ortho Weed B Gon Max plus Grabgrass control Bayer Advanced All-In-One Lawn Weed & Grabgrass Killer Ortho Weed B Gone Max plus Crabgrass Control.