Probably yes, Garou has demonstrated to be crafty enough to use the environment to his advantage, like using trees as platforms, ways to hide or even weapons, or even pulling the roots to make other lose balance and so on. I don't see it so impossible for Garou to employ rocks, dirt and everything he csn find in Central Park as ways to attack a blob, given that he can clearly figure out that punching wouldn't be really effective. He can even send air slashes with Bomb's technique. All of this while easily avoid every physical approach and deflecting and/or reflecting projectiles. Sludge Wave is aoe, but it also travels on the ground and Garou would already keep the distance, and he can go on fighting for a long time. Adaptation, Reactive evo and Accelerated Development may even compensate for stats buffs and debuffs.