Why Wait to Fertilize Zoysia Until 90% Green? Early Fertilizer + Late Freeze = Dead Grass

Zoysia can't use fertilizer until it has active roots—which need green shoots AND soil >65°F. No reserves to survive early fertilize + freeze.

Proof

Neighbor's 'Emerald' zoysia fertilized mid-March 2007. Easter freeze April 6 killed 50%. Took 2 years + re-sprigging to recover.

Rule

Wait for 90% green. That's when roots are ready.