Coreopsis x ‘Jethro Tull’
(Coreopsis auriculata ‘Zamfir’ x Coreopsis lanceolata ‘Early Sunrise’)
kor-ee-OP-sis aw-rik-yoo-LAY-tuh x kor-ee-OP-sis lan-see-oh-LAY-tuh
Coreopsis ‘Jethro Tull’ is a hybrid cross between Coreopsis auriculata ‘Zamfir’ (female parent) and Coreopsis lanceolata ‘Early Sunrise’ (male parent). This cultivar was introduced by Itsaul Plants in 2008 (PP18789).
The genus Coreopsis L., and species Coreopsis auriculata L., and Coreopsis lanceolata L. were named and described as such by Carl von Linnaeus in the second volume of the first edition of Species Plantarum in 1753.
As of 12-22-21 when this page was last updated, Plants of the World Online by Kew lists 88 species in the genus Coreopsis. It is a member of the plant family Asteraceae with 1,678 genera. Those numbers could change as updates are made on POWO. The number of genera in the family fluctuates often.
THERE ARE SEVERAL LINKS AT THE BOTTOM OF THE PAGE FOR FURTHER READING.
A good friend and fellow plant collector, Walley Morse, gave me this clump of Coreopsis ‘Jethro Tull’ in the spring of 2012. It did very well so I brought it with me when I moved back to the family farm in mid-Missouri in February 2013.
I dug a new flower bed on the south side of my parent’s home and put it in the west side of the bed. I didn’t like it in that spot, so I moved it to the east side.
Coreopsis species are very variable and classifying them is complicated to explain. They are very closely related to the genus Bidens. Several Coreopsis species have been moved to other genera including Bidens. Wikipedia gives great information provided by the USDA Plants Database (formerly GRIN-Germplasm Resources Information Network-USDA) which divides the species into 11 sections… GEEZ! Coreopsis is a very variable species.
Zones: USDA Zones 4a-9b (-30 to 25° F)
Size: 18” tall and wide
Light: Full sun
Soil: Average, well-drained soil
Water: Average water needs. Drought tolerant once established
Propagation: Divide clumps in spring every 2-3 years
Maintenance: Deadhead spent flowers for repeat bloom.
Concerns: Mine died from mildew. Can crown rot if the soil is too moist for too long.
Coreopsis are very good garden plants and a number of species and cultivars are available from many sources. One of my favorite sources would be Bluestone Perennials. Coreopsis ‘Jethro Tull’ are proven hardy in USDA zones 4a-9b, but many species are hardy down to zone 3.
The Coreopsis ‘Jethro Tull’ started out fine in the spring and flowered well all summer. Toward the end, though, it started having an issue with powdery mildew. I a not sure if it returned in the spring of 2014 or not but I don’t have photos past 2013. I really liked this Tickseed and there are several cultivars on my wish list. Since I had the issue with powdery mildew, I am not so sure now…
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