Kentucky Bluegrass Watering Guide
KBG needs 1.0-1.5 inches of water per week — more than tall fescue. Water deeply and infrequently: 2-3 times per week, not daily. Deep watering encourages roots to grow down. During summer heat, you have TWO valid options: (1) irrigate fully at 1.5 inches/week to keep KBG green, or (2) let it go completely dormant. DO NOT half-water — applying 0.5 inches/week keeps the crown active but doesn't sustain the plant, leading to crown death. Dormant KBG turns brown but the rhizomes and crowns stay alive for 4-6 weeks without water. It will green up dramatically when fall rains return or you resume irrigation. If you choose dormancy, apply 0.25 inches every 3-4 weeks during extended drought just to keep crowns alive.
Frequently Asked Questions
How much water does KBG need?
1.0-1.5 inches per week. KBG has shallower roots (18 inches) than fescue (24 inches), so it needs more consistent moisture. Water deeply 2-3 times per week.
Can I let KBG go dormant in summer?
Yes, and it will recover dramatically in fall. The critical rule: choose one strategy. Either irrigate consistently OR let it go fully dormant. Half-watering — occasional light watering — is the worst option because it breaks dormancy without sustaining it.
Why is half-watering bad for KBG?
When KBG breaks dormancy, it uses stored energy reserves. If you water just enough to green it up but not enough to sustain growth, it burns through reserves and may not survive. Commit to full irrigation or full dormancy.
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