Damage to bower vine roots?
We recently bought a house and we had to remove all the crabgrass and weeds in the back yard (scalped the yard about 4-5 inches) to revamp the sprinkler system to prepare for new grass and plants. There is a beautiful bower vine growing over an arbor, but the roots were very shallow and are now at the surface. Since we'll be laying sod back where the roots are, we need to dig down a few inches so it's level with the patio, but the darned roots are everywhere! How much root system can I cut back without killing the vine? I really love it! I feel like I need to carefully dig beneath the roots and push them down a couple of inches then cover with dirt, but that could take ages!
Thank you for your ideas.