Hardiness: 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) 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)
Sun Exposure: Full Sun
Bloom Color: Bright Yellow
Bloom Time: Late Spring/Early Summer Mid Summer Late Summer/Early Fall
On Jul 6, 2010, thetripscaptain from Racine, WI (Zone 5a) wrote:
These grow like crazy and produce hundreds of flowers over the course of the summer. They are much stronger plants than the thinner species of Coreopsis such as C. tinctoria. It does have a sort of wild, weedy look to it once it has been blooming for a while. We use sticks and twine to sort of prop them up and that along with constant deadheadding keeps them under control. At the end of each summer I have so many C. grandiflora seeds that I don't quite know what to do with them all.
On Oct 7, 2009, plantango from Fox Island, WA wrote:
While growing this plant in Southern California, I noticed a tendency for the leaves to sometimes turn white with a light mold even in summer. I had a small group planted in poor, well-drained soil with full sun next to a hedge. I suspect stress from drying out or possibly from lack of air circulation. Otherwise proved an easy-to-grow plant with incredible profusion of golden flowers.
On Jun 16, 2005, achoogardner from Red Oak, NC (Zone 7b) wrote:
This is an easy and beautiful plant. Mine has been blooming none stop after being in the ground for two weeks. It loves full sun and doesn't need much water. My neighbor comments me on it every time she is over!
On Jul 2, 2004, bluetopazskye from Covington, KY wrote:
I put in 4 Early Sunrise along a border and was really happy with the spread and floral display. They make a beautiful round high mound of flowers. They do need daily upkeep to deadhead and flies are attracted to them. After two seasons, all four did not come back this year. I found on one site the note that coreopsis tend to live 3-4 seasons, but only after I replaced them with four more. That's disappointing. Any other experiences with short life span?
On May 1, 2004, sweezel from McKinney, TX (Zone 8a) wrote:
Beautiful when tall and covered in lots of blooms and buds in May. Here in zone 8a/7b (North Texas), they seem to like part sun very well. Mine is getting 4 or 5 hours of morning sun and thrives. I have had it in the ground a year and fertilized it lightly once with fish meal, once with alfalfa meal this spring, but that is all. It is in barely amended black alkaline clay and very happy. The leaves are evergreen with a pretty, flat, maybe 6 inch clump of leaves when not flowering. It stays that way until early spring when the stalks start growing and it gets about 24 inches tall when flowering.
On Jul 27, 2002, DavidPat5 from Chicago, IL wrote:
DO NOT FERTILIZE Coreopis. They are very easily burned. I used Miracle Grow on mine and many of the new buds are turning brown before they flower. They have been flowering profusely since mid June. They dont seem to be very good cut flowers.
On Nov 8, 2000, gardener_mick from Wentworth, SD (Zone 4a) wrote:
These are a perennial in zones 4-9. They need full sun and well drained soil that is fertile and somewhat moist. They produce 1-1 1/2" yellow to orange, single to double flowers on top of 1-2' stems. The foliage is a deep green. They bloom from early to late summer and may bloom in fall if deadheaded.
This plant has been said to grow in the following regions:
San Leandro, California Bartow, Florida Between, Georgia Hawkinsville, Georgia Stone Mountain, Georgia Villa Rica, Georgia Washington, Illinois Noblesville, Indiana Westfield, Indiana Albuquerque, New Mexico Polkton, North Carolina Red Oak, North Carolina Cambridge, Ohio Oklahoma City, Oklahoma Mill City, Oregon Mckinney, Texas Camano, Washington Kalama, Washington Wind Point, Wisconsin