Threadleaf Coreopsis, Tickseed
Coreopsis verticillata 'Zagreb'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Coreopsis (kor-ee-OP-sis) (Info)
Species: verticillata (ver-ti-si-LAH-tuh) (Info)
Cultivar: Zagreb
View this plant in a garden

Category:

Perennials

Height:

18-24 in. (45-60 cm)

Spacing:

15-18 in. (38-45 cm)

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

Sun to Partial Shade

Danger:

N/A

Bloom Color:

Gold (Yellow-Orange)

Bright Yellow

Bloom Time:

Mid Summer

Foliage:

Herbaceous

Other details:

This plant is attractive to bees, butterflies and/or birds

Soil pH requirements:

4.6 to 5.0 (highly acidic)

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)

8.6 to 9.0 (strongly alkaline)

Patent Information:

Non-patented

Propagation Methods:

By dividing the rootball

Seed Collecting:

Unknown - Tell us

Regional

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

Fayetteville, Arkansas

Fountain Valley, California

Cos Cob, Connecticut

New Haven, Connecticut

Bear, Delaware

Deland, Florida

Atlanta, Georgia

Bethlehem, Georgia

Marietta, Georgia

Carbondale, Illinois

Cherry Valley, Illinois

Nilwood, Illinois

Peoria, Illinois

Spring Grove, Illinois

Washington, Illinois

Waukegan, Illinois

Mishawaka, Indiana

Terre Haute, Indiana

Iowa City, Iowa

Shawnee Mission, Kansas

Barbourville, Kentucky

La Grange, Kentucky

Lexington, Kentucky

Salvisa, Kentucky

Kennebunk, Maine

Madison, Maine

Jamaica Plain, Massachusetts

Saugus, Massachusetts

Somerville, Massachusetts

Dearborn Heights, Michigan

Farmington, Michigan

Owosso, Michigan

Royal Oak, Michigan

Trenton, Michigan

Hopkins, Minnesota

Kasota, Minnesota

Minneapolis, Minnesota

Rosemount, Minnesota

Saint Cloud, Minnesota

Saint Paul, Minnesota (2 reports)

Belton, Missouri

Miles City, Montana

Omaha, Nebraska

Whitefield, New Hampshire

Cedar Knolls, New Jersey

Jamesburg, New Jersey

Whitehouse Station, New Jersey

Glen Head, New York

Ithaca, New York

Kew Gardens, New York

Penn Yan, New York

Southold, New York

Belfield, North Dakota

Cincinnati, Ohio

Delaware, Ohio

Newark, Ohio

Baker City, Oregon

Bend, Oregon

Chiloquin, Oregon

Ambler, Pennsylvania

Lititz, Pennsylvania

Pottstown, Pennsylvania

Wilkes Barre, Pennsylvania

Aberdeen, South Dakota

Rockwall, Texas

Rowlett, Texas

Sugar Land, Texas

Farmington, Utah

Ruther Glen, Virginia

Virginia Beach, Virginia

Kalama, Washington

Spokane, Washington

Vancouver, Washington

Columbus, Wisconsin

Minocqua, Wisconsin

West Bend, Wisconsin

show all

Gardeners' Notes:

11
positives
3
neutrals
1
negative
RatingContent
Neutral

On May 14, 2015, Sequoiadendron4 from Lititz, PA (Zone 6b) wrote:

This plant is a decent spreader and has nice foliage. The bloom is decent as well and attracts many small pollinators. Ours is planted in a part shade location and gets powdery mildew every year right after it's finished blooming. Easily divided but you need to dig out a chunk as the stems don't hold up well if separated from the root mass. I transplanted a bunch late last season. It returned in the new locations and even spread a little. The new locations are in a sunnier spot so I'm eager to see if it still gets powdery mildew after bloom.

Positive

On Jul 10, 2012, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

I have issues with coreopsis; I have planted several Moonbeam, Creme Brulee, rosea, and Jethro Tull more than once, and none of them ever returned. Mouse ear 'Nana' may or may not come back; it's very inconsistent. Zagreb, however, returns every year and thrives on neglect. It blooms and blooms, has a nice mounded shape, and the fine feathery foliage is very attractive. Seems to be tolerant of full hot sun or partial shade. It does increase in size over time, but I only divide mine about every 3rd year or 4th year. This is a great border plant.

Positive

On Jul 2, 2011, Lapwing from CEDAR KNOLLS, NJ wrote:

Spreads quickly so be prepared to divide relatively frequently. Pretty flower with long bloom time.

Neutral

On Oct 20, 2010, annakins from Aberdeen, SD wrote:

Blooms its fool head off all summer. Didn't realize how much it spreads. I have to divide every year and put some into pots with other flowers.

Positive

On Jun 16, 2010, littlelamb from Virginia Beach, VA (Zone 8b) wrote:

I'm loving this plant. I have it planted on the South side of my house so it receives afternoon sun from 3-7 which can be pretty brutal in my climate zone (heat/humidity). I planted it last Spring and it did fair since it was still a new plant. But this year, it came back with gusto and I really like the shape it holds. Of course it has tons of flowers on it which will be around for awhile to enjoy.

Positive

On Sep 1, 2009, Grinder12000 from Columbus, WI wrote:

I love Coreopsis verticillata. I planted five in heavy clay, full sun. The first year was your typical 1st year growth. Year 2 was wonderful until we had 12 inches of ran in 7 hours and they were underwater.

Came back strong and they are one my my most vibrant plants. They bloom until the 3rd week of July and then fade. Each plant is about 18 inches wide and 20 inches tall.

Positive

On Jun 8, 2008, DeenDixie from Fayetteville, AR wrote:

Zagreb grows well for me in my front (northwest Arkansas) garden, facing east, where it gets 4 1/2 or so hours of morning sun. This is the 3rd year I have grown it, and my 6 original gallon-size plants have now doubled their size. The first blooms of the year (late May) usually do not open well... I suspect something to do with the pecan tree blossums falling 20 feet away, which blow into the Zagrebs. In mid June they roar into flower, giving me many months of bright yellow bloom. I water them every 3 weeks or so in case of no rain. This year I plan to spray them every couple of weeks with BloomBooster and see if that has a positive effect. Kind regards. :-)

Positive

On May 25, 2008, straea from Somerville, MA (Zone 6b) wrote:

I have grown 'Zagreb' in more favorable conditions, but I am currently growing it in a sloped, hot, windy, poor-soil site and it's still trooping along. It is not as vigorous at this site as it is under those more favorable conditions, but it has stood up well to the harshness of the site, blooming without fail for a lengthy period and attracting bees and other small pollinators.

Negative

On Feb 17, 2008, coo13549 from Batavia, OH (Zone 6a) wrote:

Planted (3) in late Spring/early summer 2007; plants did fine but not one flower. They get hot sun all day, and are planted in holes in a mulch covered garden cloth. The soil under that cloth is pretty poor, too (heavy clay).

Neutral

On Mar 21, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

Short to Medium 18"- Plant 14" apart. Golden yellow flowers on a more upright plant. Especially free flowering - continuously in bloom from early summer right into fall. Makes a good cut flower with its unusual narrow tapered foliage. They spread readily and can be used in a naturalized planting, on a sunny bank, or in the traditional border. While they attract butterflies, they are deer resistant.

Positive

On Jun 27, 2006, knolan from Sugar Land, TX (Zone 9a) wrote:

I'm very happy with coreopsis. I have dried the flower heads and am collecting seeds. Will post the progress if they mature into plants.

Positive

On Jul 4, 2005, russkiypenguin from Belton, MO wrote:

I planted two of these plants then completely ignored them for a year. Despite that one of them made it through to the next year wonderfully and now I'm nursing the second one along. Beautiful yellow flowers in the middle of the summer despite the fact that I didn't even improve my tough Missouri clay soil.

Positive

On Apr 21, 2005, KC3Lady from Overland Park, KS (Zone 6a) wrote:

I love this plant! I would have it in my garden because of the beautiful, airy foliage even without the flowers it produces. I have two of these plants that were transplants from my mother's garden. They both bloomed the year I transplanted them and every year since. They have been reliable and absolutely no-fuss at all.

Positive

On Oct 13, 2004, Joan from Belfield, ND (Zone 4a) wrote:

This beautiful plant has never failed me. Comes back year after year like an old and faithful friend. I love it!

Positive

On Jun 1, 2003, lauburt from Vancouver, WA wrote:

Blooms continuously from June until frost. Nice, bright yellow color. I especially enjoy the feathery foliage!