Not sure if this is the correct forum to place this or over in landscape maintenance? I have a job tomorrow where I'm planting several 5-6 foot B&B Green Giant arborvitaes. I have never added any fert at time of planting before so that's why I'm asking if it's a good idea, bad idea, or doesn't matter either way. I want to know if anyone does this or recommends mixing in a liquid fert while watering in and back filling? Like a root simulator that reduces transplant shock such as a 4-10-3 or even a super phosphate 0-45-0? Like I said, I usually just plant and then water in with nothing else. Is there a real benefit to adding what I mentioned or is it recommended to do it at certain times of year depending on when you plant?