You may use a very light mulch to lower soil temperature and retain moisture longer. You should be able to see the soil through the mulch. Pine needles are the best material. Do not apply the mulch tight against the stems as this may cause the stems to rot. Do not apply the mulch thick enough to control weeds because it may impede aeration and water penetration.
Weeds compete with kiwi plants for water and nutrients.
Control weeds with timely applications of herbicides. Contact your county Extension office for recommendations. Pruning and tying need to be properly done to develop a correct production and support system. As the main trunk is growing, support it with a cane or stake. For every 24 inches of growth, cut back 8 inches, or for every 30 inches of growth, cut back 12 inches.