Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000407
11/12/99

Coreopsis grandiflora--Tickseed


Hardiness Zones: 5 to 9
Height: 3 ft Spread: 1 ft
Type: herbaceous perennial
Flowers: Yellow

Comments: This member of the coreopsis family produces
single or double, yellow flowers that are suitable for
cutting. The plant grows in most garden soils and needs a
growing area in full sun. Remove the flowers as they fade
to extend the blooming period. The stalks become long and
weak and tend to break in windy or rainy weather. Dwarf
varieties do not have this problem. Winter protection is
suggested. Tickseed will self seed and become a weed.

Propagation: Propagation is by division, seed or cuttings.
Basal cuttings may be used and division is done in autumn
or spring. The seed germinates in 5 to 10 days at
temperatures between 70 and 75 degrees. The plant blooms
the first year from seed.

Cultivars: The cultivars listed include those of C.
lanceolata and hybrids between C. grandiflora and C.
lanceolata.
'Early Sunrise' - Double, golden-yellow flowers are
produced all summer (Vis. 1).
'Flying Saucers' - Large, golden-yellow flowers.
'Goldfink' - A compact plant produces bright yellow
flowers. A cultivar of C. lanceolata.
'Mayfield Giant' - One of the tallest varieties.
'Rotkelchen' ('Robin') - Plants only 10 inches tall
produce full-sized flowers. A cultivar of C.
lanceolata.
x 'Ruth Kelchen' - Yellow flowers have red centers. C.
lanceolata.
'Sonnenkind' ('Baby Sun') - Good production of yellow
flowers. C. lanceolata.
'Sunburst' - Semi-double, yellow flowers. C. lanceolata.
'Sunray' - Double and semi-double flowers (Vis 2).
'Sunrise' - Yellow flowers (Vis. 3).
'Tequila Sunrise' - The foliage is marked with shades of
cream and yellow. The flowers are yellow.

References for Cultivars: Walters Gardens 1999, Bailey
Nurseries 1999, Thompson and Morgan 1997, White Flower
Farm 1999, Lake County Nursery 1999, Wayside Gardens 1999,
Ray Wiegand's Nursery 1999, Weston Nurseries 1999, Berryhill
Nurseries 1999, Midwest Groundcovers 1999, Willoway
Nurseries 1999. Lowell C. Ewart, 1997 Flower Seed Trials,
Michigan State University.


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