Rake away any mulch around the base of the vine in all directions, uncovering a total area of approximately 10 feet by 10 feet.
Sprinkle 4 cups of fertilizer evenly on the bare soil with a 5-10-10 or 5-10-5 formulation, covering the entire area. Stay 12 inches away from the base of the plant to avoid burning the stem.
Mix the fertilizer into the topsoil, working the granules down to a depth of 1 inch. Put the mulch back in place.
Water the fertilized area if precipitation won't fall in the next 24 hours. Soak the mulch and soil with 1 inch of water.