
Photo: Ethan2039, CC BY-SA 4.0, via Wikimedia Commons
- Sun
- Full sun; tolerates light or partial shade
- Soil
- Well-drained, moist loam
- Soil pH
- Slightly acidic to neutral, about 6.0-7.0; also tolerates neutral to alkaline soil
- Water
- About 1-1.5 in per week in the growing season. Goes dormant in drought
- Hardiness
- USDA zones 3-7; cool-season grass
- Height and spread
- Mow at 2-3.5 in. Spreads by rhizomes

Guv's tipMow bluegrass at 2-3.5 inches, higher in summer heat. Seed in late summer to early fall, mid-August to mid-September.
Through the year
Months are a rough guide. Time it by your own frost dates.
When to plant
Seed in late summer to early fall (mid-Aug to mid-Sep; overseed Aug 15-Sep 1). Lay sod during the growing season
Harvest or flowering
Flowers late spring to early summer (flowering starts in May, seed mature by mid-June). Rarely seen in regularly mown lawns
Pruning
Mow regularly at 2-3.5 in, higher in summer heat
Making more plants
Seed or sod; spreads by rhizomes
Watch out for
White grubs (e.g. Japanese beetle larvae)
Look for: Brown patches; turf lifts like carpet
What to do: Labeled grub control: preventive in June when adults lay eggs, or curative after rain when grubs feed near the surface
Summer patch
Magnaporthiopsis poaeLook for: Orange-brown to straw circular patches/rings of dead turf in summer
What to do: Mow at about 3 in, water deeply and infrequently, core aerate, use balanced nitrogen and resistant cultivars. If severe, apply a fungicide preventively (when soil is above 65°F)
Always read and follow the label on any treatment, and check it is approved for use where you live.
Safety and spread
Pets and people: Not listed as toxic by the ASPCA or the University of California toxic plant list
Weed risk: Not on the federal noxious weed list
The Plant Doctor and the Guv's book
Printable pest and disease charts with real photographs, and all 50 USA plants in one book.
Guv's Gardens
