Mr. Weedy says: Now’s a great time to prune any low tree limbs protruding over turf grass or walkway areas. Trees limbs casting shadows over turf grass that is warm season will deftly caused thinning. Depending on your grass variety, if the sunlight is not increased within the shady areas you can experience thinning to the turf or yellow or brown blade tips. You can safely remove one fourth of the foliage of any healthy tree during the growing season. It’s now recommended that you take action before it’s too late.