Kentucky Bluegrass
Poa pratensis

Family: Poaceae (poh-AY-see-ee) (Info)
Genus: Poa (POH-ah) (Info)
Species: pratensis (pray-TEN-sis) (Info)




under 6 in. (15 cm)

6-12 in. (15-30 cm)

12-18 in. (30-45 cm)

18-24 in. (45-60 cm)


Unknown - Tell us


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:

Full Sun


Unknown - Tell us

Bloom Color:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer



Other details:

Unknown - Tell us

Soil pH requirements:

5.1 to 5.5 (strongly acidic)

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Wellington, Colorado

Lewisburg, Pennsylvania

Gardeners' Notes:


On Feb 25, 2012, Clary from Lewisburg, PA (Zone 6b) wrote:

Growing our kentucky bluegrass lawn has been a learning experience - but worth it. We've finally gotten the hang of it and our lawn looks fantastic. It's all-natural.

Our grass looks best in spring and fall. In fact, I usually have a green lawn until it snows, and at spring thaw you can see that growth has already started. This grass requires a lot of water, a lot of lime, regular mowing to maintain 1.5", annual aeration, and a few applications of fertilizer through the season.

The color is outstanding, as is the soft freshness of the leaves. I'm glad we made the effort to establish this plant for our lawn.

Songbirds especially enjoy the lawn for the bugs and larvae - good food for a bird. And I enjoy watching them!

... read more


On Aug 18, 2011, Cindy_Rae from Kansas City, MO (Zone 6a) wrote:

paani-We've tried Kentucky Bluegrass without any success. I read how pretty a green it is and thought we just HAD to have it.
We have 2 Black Walnuts out back and several others I'm trying to control and have been unsuccessful in growing any grass under them, except of course weeds and prairie grasses! :D
However, to be fair, the grass hasn't done too well here (KCMO) except in the cooler early spring and late fall. Apparently if I had researched further, I would've found that it doesn't like our excessive heat during the summer. If you put a ridiculous amount of water on it throughout the summer it will do a bit better, but it's definitely a cool-season grass.
MO Conservation says Buffalo Grass-a native grass, is a good alternative for lawns & only has to be mowed a ... read more


On Jan 30, 2011, paani from Saint Louis, MO (Zone 6a) wrote:

An Ohio State U. Extension Factsheet (HYG-1148-93) says, "The beneficial effect of black walnut on pastures in encouraging the growth of Kentucky bluegrass (Poa pratensis L.) and other grasses appears to be valid as long as there is sufficient sunlight and water." (quoted by Tom Clothier - ).

Does anyone know if Kentucky Bluegrass will actually grow within the radius of a black walnut? Or would you still have that no-grass circle under the walnut tree?