I planted 2 rows of hawthorn shrubs last year on hillside entrance laneway. They are 2 feet high now but weeding is very labour intensive . Row length is 100ft. I’m advised to place pearmeabile plastic sheeting along rows to suppress weeds. They say rainwater will get through but I’m worried because of medium gradient of hillside. I’m concerned that plant will be starved of rainwater. Can you please advise?