Hardiness: 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)
Sun Exposure: Sun to Partial Shade
Bloom Color: Gold (Yellow-Orange) Pale Yellow Bright Yellow Green
Bloom Time: Mid Summer Late Summer/Early Fall
Other details: May be a noxious weed or invasive This plant is attractive to bees, butterflies and/or birds Drought-tolerant; suitable for xeriscaping Average Water Needs; Water regularly; do not overwater Self-sows freely; deadhead if you do not want volunteer seedlings next season This plant is resistant to deer
Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral)
On Oct 20, 2011, NancyMcD from Grand Marais, MI wrote:
'Prairie Sun' is a short-lived perennial for us here on the south shore of Lake Superior. What a performer! Once it starts blooming, there's no stopping it until hard frost. It self-sows reliably but not weedily. The color combination goes well with many other flowers, unlike the rather harsh highway-line-yellow so common in this genus. Great cut flower, too. This one is a real winner here; highly recommended.
On Jul 12, 2010, gardadore from Saylorsburg, PA (Zone 6a) wrote:
I don't depend on the plant to return the next year in my zone but make sure to sprinkle the seeds around. It acts more like a bi-annual, blooming the second year, giving seed but rarely returning. Absolutely gorgeous in a mass!
On Jun 13, 2010, gardeningfun from Harpersfield, OH (Zone 5a) wrote:
Did not come back in zone 5a this year -2010. Planted it last summer. I bought this at a very reputable nursery here North Eastern Ohio, as a large potted plant. Planted it in full sun, clay soil. It declined in late summer and never came back this year. All the other plants in that garden returned, but this one. We had very heavy snowstorms and low temps this last winter. The Indian Summer Rudbeckia didn't come back either.
On Oct 15, 2007, kqcrna from Cincinnati, OH (Zone 6a) wrote:
This plant wintersowed very well for me.
It is actually a different type rudbeckia than "Irish Eyes". I wintersowed both, and both are very pretty. Both have a green eye. Irish Eyes grew larger blossoms, but had fewer petals per blossom. There is also a much less defined color change as petals run from eye to the outer edge of the flower.
On Jul 8, 2006, flamingonut from New Milford, NJ wrote:
This is one of my favorite Rudbeckias; it's well behaved, and although I've seen conflicting information in regards to it's hardiness, I've had mine for 3 years now, and hasn't reseeded. I do keep it deadheaded.
On Jan 20, 2003, Terry from Murfreesboro, TN (Zone 7a) wrote:
A half-hardy annual, this variety has an unusual green center and bright orange-to-yellow petals.
July 2008 update
I snagged a gallon of 'Prairie Sun' at a local grocery store today. What a wonderfully sunny, cheery plant. The tag on this pot says hardy to zone 3, which would certainly make it more than a half-hardy annual. Guess we'll see what happens this winter!
This plant has been said to grow in the following regions:
Calistoga, California Pacifica, California Richmond, California Highland Acres, Delaware Hebron, Kentucky Salvisa, Kentucky Grand Marais, Michigan Mason, Michigan Spicer, Minnesota Waynesboro, Mississippi Lincoln, Nebraska New Milford, New Jersey Glens Falls, New York Ronkonkoma, New York Beaufort, North Carolina Zebulon, North Carolina Cincinnati, Ohio Geneva, Ohio Salem, Oregon Drexel Hill, Pennsylvania Saylorsburg, Pennsylvania West Wyomissing, Pennsylvania Blythewood, South Carolina North Augusta, South Carolina Hockley, Texas Provo, Utah Newport News, Virginia Rushmere, Virginia Alderwood Manor, Washington East Port Orchard, Washington Kalama, Washington Menasha, Wisconsin