Hardy Rubber Tree (Eucommia ulmoides)

Common names:
Give a thumbs up Hardy Rubber Tree
Give a thumbs up Du Zhong
Give a thumbs up Tuchong
Give a thumbs up False Gutta-Percha

General Plant Information (Edit)
Plant Habit: Tree
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 5a -28.9 °C (-20 °F) to -26.1 °C (-15 °F)
Maximum recommended zone: Zone 7b
Plant Height: 30 to 60 feet
Plant Spread: 30 to 60 feet
Leaves: Deciduous
Broadleaf
Fruiting Time: Summer
Late summer or early fall
Fall
Flowers: Inconspicuous
Flower Color: Green
Bloom Size: Under 1"
Uses: Shade Tree
Medicinal Herb
Resistances: Deer Resistant
Rabbit Resistant
Pollution
Propagation: Seeds: Self fertile
Pollinators: Wind
Containers: Not suitable for containers
Miscellaneous: Tolerates poor soil
Dioecious
Conservation status: Near Threatened (NT)

Conservation status:
Conservation status: Near Threatened
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Comments:
Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Aug 7, 2018 2:24 PM

I remember a basically good specimen of Hardy Rubber-tree about 30 feet high and wide that had been planted to the side of the two story, grey Ornamental Horticulture Building that once existed at the University of Illinois in Urbana, IL in the 1970's. That building was erased, along with the identical Fruit & Vegetable Horticulture Building, in the early 1990's. Now there is a Plant Science Building to the southeast of that old location of the two identical buildings next to Turner Hall. This species from central China has dark, shiny elm-like or cherry-like leaves that develop no autumn colour. It has grey-brown ridged and furrowed bark. It is urban tolerant and adaptable to many soils that are not too wet or dry. It is a rare tree in the USA. I only viewed it as an interesting botanical exotic and not a lovely tree to grow. It has a tropical appearance. There are reports of it suffering from some dieback and decline from some disease in the Midwest. Goodmark Nurseries and Spring Grove Nurseries in the Chicago, Illinois area are offering some for sale. Otherwise, I have not seen any other. I believe that Morton Arboretum in Lisle, Illinois has a few.

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