Since "a" and "b" are inevitable, crabgrass pressure can only be managed by reducing the direct sunlight:
- Growing a thick lawn,
- High mowing,
- Restraint from whacking/scalping the edges,
- Shade (trees).
Since lawns are neither perfectly thick nor perfectly mowed, there is often a reliance on crabgrass control products to suppress most of the crabgrass that would normally germinate by mid-spring.