Help Jasmine taking over. I recently cut back an 8x25 area of Jasmine ground cover all the way to the ground using a weed eater. I cant use herbicides due to raising dachshunds. I have read that if I raise the PH, the jasmine wont re-grow but, I have an large oak and magnolia tree in the same area. The large tree roots also make it impossible to run a tiller in the area. I want to put a wooden deck over the top of the area. Will the deck block enough sunlight and keep the jasmine from growing back? I would hate to put up a deck only to later have jasmine start growing and pushing its way through the deck boards. Thanks for your time!