I have a customer with 4 roadside pine trees that are about 50 feet tall. Many of the branches touch the ground and mowing around them is a real pain. I was thinking of pruning all the branches off to about 5 feet off the ground and then putting bark mulch underneath. Any tricks or tips on the pruning? And with the mulching, should I get rid of the existing needles before mulching? And finally, what would be a good planting that would survive underneath the trees? Thanks!