Thuja occidentalis 'DeGroot's Spire' / Degroot's Spire Arborvitae
Also known as 'Degroot's Emerald Spire' or most often seen with the incorrect spelling, 'Degroot's Spire.'
Thuja occidentalis'DeGroot's Spire' is a narrow upright very fastigiate form of Eastern arborvitae with medium-green, twisted foliage. The outline is less smooth and symmetrical than most other upright arborvitae making it even more interesting. Foliage tends to turn to a dark mossy-green to true bronze color in midwestern U.S. winters. Typical rate of growth most areas is about 6 inches (15 cm) a year, resulting in a narrow upright tree 3 feet (1.5 m) tall by 15 inches (40 cm) wide after 10 years in the landscape. This cultivar is quite suitable as a solitary exclamation point in the garden or for use as a formal hedge.
Iseli Nursery Inc.
This narrow columnar form of American arborvitae is unique both for its form and refined texture.
Constant DeGroot (1922-1971), longtime production and propagation manager at Sheridan Nurseries, Toronto, Ontario, Canada selected this cultivar from a batch of seedlings in 1970. Sheridan introduced it in 1980, naming it for the finder. Iseli Nurseries, Inc. of Boring, Oregon is credited with the U.S. introduction around the same time. (History based on an email conversation (10/01/14) between Larry Sherk, retired Chief Horticulturist at Sheridan Nurseries and David Olszyk, ConiferBase editor.
Thuja occidentalis 'DeGroot's Spire.' This picture was taken in Michigan during the ACS tour in 2000.
Photo by Ken Church
Thuja occidentalis 'Degroot's Spire'
The Harper Collection of Dwarf & Rare Conifers located at Hidden Lake Gardens in Tipton, MI. Photo taken August of 2005.
Photo by Dax Herbst
Thuja occidentalis 'DeGroot's Spire' — 10 years in the ground from a gallon-sized pot grown as a single leader which is very important to prevent splaying out in ice storms in the Indianapolis, Indiana area.
Photo by Terri Park
Jay and Terri Park
I have had multiple errors attempting to upload 3 different photos of DeGroot's Spire of size ranging from 6679-8862 KB, so I don't think the size is too great. However I was successful uploading Pseudotsuga men. Glauca Pendula photo. Not sure what the issue is because they seem to be uploading, then I get the error at the end of the upload.
Thanks for the uploading tips, David. I'll get over the learning curve bumps after a few entries. My comments on the winter color: This is about the only conifer that I have <strong>several </strong>of scattered all over 3 acres, and have for 15 years. It has NEVER turned bronze in my Indianapolis area garden. It deepens to a dark moss green as most conifers seem to go a couple shades darker in the winter compared to their fresher, brighter summer color. And we get some pretty cold weather without benefit of snow to insulate on a typical winter. Winter of 2014 was particularly snowy, but VERY windy and I believe the snow reflection and wind caused most of the plant damage. The actual temperatures were not that severe, as we were down to -37 in 1995 and in the '80's we had -20 a few times. But that was before we started collecting conifers and rare deciduous trees.