Hemlock Hill

2054 plants

Hemlock Hill
Leafy undergrowth in a hemlock forest

Background

Fun Facts

  • Tsuga chinensis (Chinese hemlock), a close relative of our native species (Tsuga canadensis), are fully resistant to Hemlock Woolly Adelgid (HWA). Find these young, approximately 9-foot-tall specimens growing along the wide path that leads to the summit of the hill.

  • Buckleya distichophylla (piratebush) is oldest cultivated plant in the Arboretum and is one of many accessions with rich documented stories. Find it thriving where the wide path from Hemlock Hill Road flattens out after a moderately pitched rise; near a semi-circle of arranged white pine (Pinus strobus) logs.

  • Planted along the lower northern contours, Kalmia latifolia (mountain laurel) flower profusely between late May and early June.

  • Frequently associated with Hemlock Hill, Rhododendron Dell features many species and cultivars of Rhododenron that typically flower between early May and early June.

About

Hemlock Hill, the largest Arboretum woodland, occupies 22 acres. It has had a complex history of disturbance, including the 1938 hurricane and arrival of the hemlock woolly adelgid. This woodland is home to a number of unique birds, amphibians, ferns, and herbaceous perennials that prefer the shady understory of dense forestland. Prominent non-native plants include glossy buckthorn (Frangula alnus), castor aralia (Kalopanax septemlobus), mountain ash (Sorbus spp.), and hawthorn (Crataegus spp.). Hemlock Hill collections inform research and feature prominently in ecosystem studies for Boston Public School fifth grade students.

Resources:

Read more about Hemlock Hill in Arnoldia:

Fordham, Alfred J. 1963. Tsuga Canadensis and its Multitude of Variants. Arnoldia 23: 100-102. [pdf]

Del Tredici, Peter. 2010. Chinese Hemlock Tsuga chinensis. Arnoldia 68(2): 65-68. [pdf]

Havil, H.P., M.E. Montgomery. 2008. The Role of Arboreta in Studying the Evolution of Host Resistance to the Hemlock Woolly Adelgid. Arnoldia 65(3): 2-9. [pdf]

Schulhof , Richard. 2008. Ecosystems in Flux: The lessons of Hemlock Hill. Arnoldia 66(1): 22-28. [pdf]

Del Tredici, P. 2004. Finding a Replacement for the Eastern Hemlock: Research at the Arnold Arboretum. Arnoldia 63(2): 33-39. [pdf]

Pink Mountain Laurel flowers
Mountain Laurel (Kalmia latifolia)
Hemlock and sweet birch in fall
Hemlock (Tsuga) and Birch (Betula) in autumn
Brown hemlock varnish shelf mushroom forwing out of a stump
Hemlock Varnish Sheld (Ganoderma tsugae)
Hemlock Woolly Adelgid
Hemlock Woolly Adelgid
Grove of Eastern Hemlock (<i>Tsuga canadensis</i>)
Grove of Eastern Hemlock (Tsuga canadensis)
Small white parasitic plants (Indian Pipe) growing up from the ground
Indian Pipe (Monotropa uniflora)
Black Birch stand in autumn color
Black birch (Betula lenta) in autumn color
Hemlock Hill
Hemlock Hill
1251-83*BMap it ↗

Ulleungdo Hemlock

Scientific Name
Tsuga ulleungensis

In 2003, a researcher collected a sample from this hemlock. Genetic analysis revealed something unusual. This tree proved to be a new species, previously unknown to science.

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1549-80*BMap it ↗

Seven Son Flower

Scientific Name
Heptacodium miconioides

A botanist at the Arnold Arboretum officially named and described the seven son flower in 1916. But the species would not be grown in the United States until 1980. This plant was among the first.

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2054 Plants in this Collection

Plant ID Accession Date Received As Origin Source

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