Kentucky Bluegrass (Poa pratensis)
Formerly Poa dolichachyra, Poa athroostachya, Poa gelida
Full sun suits Kentucky bluegrass best, and part shade is also listed. It is a herbaceous perennial grass. Soil should be well drained and moist, with a pH of 6 to 8. The listed hardiness range is USDA zones 3a to 7b. It flowers from May to July. Its growth rate is moderate. Watering and pet toxicity for cats and dogs are not documented here.
Quick facts
| Light: | Full sun and part shade (full sun preferred)12 |
|---|---|
| Soil: | Well drained and moist; pH 6–811 source |
| Hardiness: | Zones 3a–7b11 source |
| Size: | 0.3–3 ft (0.1–0.91 m) × 0.5 ft (0.15 m)13 |
| Growth rate: | Moderate13 |
| Bloom: | May–Jul, Yellow, green, brown and purple121 source |
| Cats: | Not documented by major sources |
| Dogs: | Not documented by major sources |
| Native range: | ABT, AFG, ALA, ALB, ALT, AMU, ARI, ARK, ASK, AUT, BGM, BLR, BLT, BRC, BRY, BUL, CAL, CHC, CHI, CHM, CHN, CHQ, CHS, CHT, CHX, CNT, COL, COR, CTA, CYP, CZE, DEL, DEN, EAI, EHM, FIN, FLA, FOR, FRA, GEO, GER, GNL, GRB, GRC, HUN, ICE, IDA, ILL, INI, IOW, IRE, IRK, IRN, IRQ, ITA, JAW, KAM, KAN, KAZ, KGZ, KHA, KOR, KRA, KRI, KRY, KTY, KUR, LBS, LOU, MAG, MAI, MAN, MAS, MIC, MIN, MNT, MON, MRY, MSI, MSO, MXE, MXN, MYA, NBR, NCA, NCS, NDA, NEB, NEP, NET, NEV, NOR, NSC, NUN, NWG, NWH, NWJ, NWM, NWT, NWY, OHI, OKL, ONT, ORE, PAK, PEI, PEN, PHI, POL, POR, PRM, QUE, RHO, ROM, RUC, RUE, RUN, RUS, RUW, SAK, SAR, SAS, SCA, SDA, SIC, SPA, SVA, SWE, SWI, TCS, TEN, TEX, TKM, TUE, TUR, TVA, TZK, UKR, UTA, UZB, VER, VRG, WAS, WDC, WHM, WIS, WSB, WVA, WYO, YAK, YEM, YUG, YUK4 |
| Family: | Poaceae |
How much light does a Kentucky Bluegrass need?
Full sun is the preferred light outdoors, and part shade is also listed. Full sun means six or more hours of direct sunlight a day. Deep shade is not among the listed light conditions. If you can count six or more hours of direct sun on a spot, it meets the full sun description.
Best soil for a Kentucky Bluegrass
Recorded soil drainage for this grass is well drained and moist. The listing describes this as good drainage. Soil pH runs from 6.0 to 8.0. That range is described as neutral. A reading below 6 or above 8 falls outside the recorded range. Moist and well drained are both named for the same grass. Soil texture is not documented on this page.
Hardiness and temperature
Temperature tolerance is described by hardiness zone, with Kentucky bluegrass listed for USDA zones 3a to 7b. The cold end of the range is zone 3a and the warm end is zone 7b. Hardiness zone is the only temperature information on record for this grass, and it gives no minimum temperature in degrees.
- Hardiness: Zones 3a–7b1
How to plant a Kentucky Bluegrass
The listed hardiness range runs from zone 3a to 7b, so check your USDA zone before planting. Choose a spot with full sun, meaning six or more hours of direct sunlight a day, or part shade. Choose soil that is well drained and moist, with a pH of 6 to 8. A mature plant spreads about 0.5 ft (0.15 m) across.
- Hardiness: Zones 3a–7b1
Winter care
In winter, the listing for Kentucky bluegrass starts at USDA zone 3a and ends at zone 7b. The zones named are 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a and 7b. Look up your own zone to see whether your winters fall inside this range.
- Hardiness: Zones 3a–7b1
How to propagate a Kentucky Bluegrass
Seed is the only propagation method recorded for Kentucky bluegrass, Poa pratensis, so this page covers no cuttings or division. Seed counts run from 2.1 to 2.2 million seeds per pound (4.6 to 4.8 million per kg). Kentucky bluegrass is a grass and herbaceous perennial that is grown from seed.
- Propagation: Seed3
Common problems
Bluegrass billbug, sod webworm and European cranefly are the pests recorded for Kentucky bluegrass. Diseases to watch for are summer patch, necrotic ring spot, rust, leaf spot, fusarium patch and powdery mildew. Summer patch gets a stronger note, because the grass is described as very prone to it.
| Problem | Kind |
|---|---|
| Bluegrass billbug | Pest |
| Sod webworm | Pest |
| European cranefly | Pest |
| Summer patch | Disease |
| Necrotic ring spot | Disease |
| Rust | Disease |
| Leaf spot | Disease |
| Fusarium patch | Disease |
| Powdery mildew | Disease |
Is Kentucky Bluegrass toxic to cats and dogs?
Recommended supplies
- Soil: a free-draining mix, and a pot with a drainage hole.
Questions and answers
- How much sun does Kentucky bluegrass need?
- Full sun is preferred, which means six or more hours of direct sunlight a day. Part shade is also listed for this grass. Deep shade is not among the listed conditions.
- Which USDA zones suit Kentucky bluegrass?
- The listed hardiness range is zone 3a to zone 7b. That covers zone 3a at the cold end and zone 7b at the warm end. Look up your own zone to compare it with that range.
- What soil pH does Kentucky bluegrass prefer?
- Soil pH is listed as 6 to 8, a range described as neutral. The soil should also be well drained and moist. Good drainage is the wording the listing uses.
Sources
- NC State Extension Gardener Plant Toolbox. https://plants.ces.ncsu.edu/plants/poa-pratensis/. Accessed 14 October 2026.
- Lady Bird Johnson Wildflower Center. https://www.wildflower.org/plants/result.php?id_plant=POPR. Accessed 14 October 2026.
- USDA Forest Service Fire Effects Information System. https://www.fs.usda.gov/database/feis/plants/graminoid/poapra/all.html. Accessed 31 October 2026.
- Royal Botanic Gardens, Kew (World Checklist of Vascular Plants). https://sftp.kew.org/pub/data-repositories/WCVP/wcvp.zip. Accessed 4 June 2026.
How this page was made
- Written with AI assistance from the sources listed on this page. AI is never the source of a fact.