Tree care that takes place after the construction process is arguably the most part of mitigating damage from the construction process. Even if you had a great tree protection plan and follow it to the “T”, there is going to be damage done. Probably to both the canopy and especially the root system. It will take the trees years to recover from the damage. But, engaging in appropriate after care will help speed up the recovery and minimize the signs of stress.
If you haven’t already done the soil de-compaction, do it soon. This is very important for helping water and oxygen penetrate the soil surface in areas where construction activity compacted the soil. Tree roots can’t regrow without these two things.
Plan to maintain a regular fertilizer regimen for at least 2-3 years. Five years would be ideal, and I recommend some form of fertilization on a regular basis depending on your landscape and site conditions.