Last fall, I killed off the KBG/TTTF/FF mixed lawn and did a TTTF only renovation.

We had a mild winter this year in Central VA, and so I didn't do a winterizer. Things stopped growing about late January, and now I can tell spring is already here. Temps in mid 70s/upper 60s on the 10 day forecast, and the grass (and some weeds) are starting to perk back up.

I was thinking the young grass could probably use a snack to help it wake up. I applied two 36# bags of Milorganite across the new 3.8k sqft TTTF lawn.

To my understanding, that's about:

72 * 0.05 N = 3.6 # N / 3.8ksqft = 0.947 # N per 1k sqft

72 * 0.02 P = 1.44 # P / 3.8k sqft = 0.378 # P per 1 k sqft

72 * 0.04 Fe = 2.88# Fe / 3.8k sqft = 0.757 # Fe per 1k sqft

72 * 0.005 K = 0.36 # K / 3.8 sqft = 0.0947 # K per 1k sqft

I know that spring feeding is typically discouraged around here (disease pressure, too much top growth, etc.), but does that hold true to new lawns? Moreover, does that concern only apply to synthetics?

I also have a bag of Jonathan Green's Greenup w/ Crabgrass Preventer (active ingredient is Dimension); it's 21-0-3, and is 25% slow release. I was going to hold off on applying that until around mid March. Then I would hold off until May and do another round of Milorganite.