Jan 26, 2018· Tips for screening. Diversify the plant material. Let's say you plant a row of Leyland Cypress (please don't, here's why), and the bagworms show up and defoliate all of them.There goes your investment. If instead, you mixed the border with Leylands, hollies, magnolias, rhododendrons and the like, then the bagworms destroy a only portion of your privacy and investment.