Photo by Melody

PlantFiles: Polyantha Rose
Rosa 'Margo Koster'

Family: Rosaceae (ro-ZAY-see-ee) (Info)
Genus: Rosa (RO-zuh) (Info)
Cultivar: Margo Koster
Hybridized by Koster; Year of Registration or Introduction: 1931

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3 members have or want this plant for trade.


24-36 in. (60-90 cm)

24-36 in. (60-90 cm)

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)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Bloom Color:
Orange and orange blend (ob)

Bloom Shape:

Flower Fragrance:
No fragrance

Bloom Time:
Late Spring/Early Summer
Blooms repeatedly


Patent Information:

Other Details:
Unknown - Tell us

Pruning Instructions:
Blooms on new wood; prune early to promote new growth

Soil pH requirements:
Unknown - Tell us

Propagation Methods:
From herbaceous stem cuttings
From woody stem cuttings
From softwood cuttings
From semi-hardwood cuttings
From hardwood cuttings
By grafting
By budding
By simple layering
By air layering
By tip layering

Click thumbnail
to view:

By palmbob
Thumbnail #1 of Rosa  by palmbob

By palmbob
Thumbnail #2 of Rosa  by palmbob

By palmbob
Thumbnail #3 of Rosa  by palmbob


3 positives
1 neutral
1 negative

Gardeners' Notes:

Positive suguy On Dec 5, 2011, suguy from Simi Valley, CA (Zone 9a) wrote:

Margo Koster is a living ancestor to miniature roses.
Over 80 years old now she's keeping up well with the newcomers.

This little rose has a lot going for it: easy to grow, super healthy foliage and terrific color that is the softest orange you will see in any bloom.

Plus it is an old-fashioned plant in every way -- graceful and restrained -- not trying to out-glow all competitors like a lot of the "new" roses.

Positive willowwind On Sep 18, 2010, willowwind from Moundridge, KS (Zone 6a) wrote:

I had one of these pretty little roses when living in western Kansas, and it put up with everything that harsh environment could give. It was in a small bed between the sidewalk and the porch, where it faced the hot afternoon sun and the cold north winter, wind. It would bloom, literally, the entire summer with a little deadheading and water during our driest periods. What a tough and beautiful little bush!

Negative torachan On Jun 6, 2009, torachan from Aurora, CO wrote:

I have had Margo Koster for five years in a bed that gets mid-morning and afternoon sun. It has not thrived in Colorado despite mulching in winter. My conclusion is that it does not like competition, as the bed is a mix of roses, lavender and spring tulips. It survives only because it is own root but I am going to shovel prune it.

Positive txjamjr On Jun 2, 2007, txjamjr from Fort Worth, TX (Zone 8a) wrote:

I had one in a very small flower bed, bounded by concrete sidewalk and driveway beside the garage. It got clobbered more than once by the garage door, only got morning sun from a NE exposure, and never fertilized or sprayed for bugs. This hardy, lovely little rose bloomed constantly from early March well into December, sometimes through Christmas. I have literally seen it covered in blossoms that were coated with ice from a North Texas ice storm, and recover to bloom again as soon as it thawed.

I loved this rose, and as will plant another one as soon as I can find it!

Neutral Paulwhwest On Jun 21, 2004, Paulwhwest from Irving (Dallas area), TX (Zone 8a) wrote:

Bred in Holland. Won the Polyantha Spray award forty times from 1998-2001.

Sport of 'Dick Koster'


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

Sacramento, California
Simi Valley, California
Dodge City, Kansas
Garland, Texas
San Antonio, Texas

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