Consider warranty or service assurances on pruning, treatments, and recently planted trees, with clear terms and timelines.

https://wiki-tonic.win/index.php/The_Ultimate_Guide_to_Selecting_a_Tree_Service:_From_Pruning_Practices_to_Stump_Grinding_Quality

Think about warranty or service warranties on pruning, treatments, and recently planted trees, with clear terms and timelines.