Water new trees once a week, regularly, during the first season, with 10 gallons of water. More for large trees. Pour the water down the trunks so it goes into the root ball, not along the top of the ground. In addition, whenever the leaves droop down or it is very hot, water again and mist the tops with the hose. Do not fertilize the first year except for shrubs.
There’s more to soundproofing than just insulation. “Blocking” noise with a non-hardening caulk to close off airborne sound paths. “Breaking” the sound path using resilient wood studs with metal clips. Last, isolating and eliminating “vibration” with special acoustical matting that seperates the wall structure from floor vibrations. You can get all these items in soundproofing kits for both interior and exterior residential walls. Besides blocking most noise transmission, one obvious benefit is better energy efficiency, with greater “r” values.