Plantae > Tracheophyta > Magnoliopsida > Ericales > Ericaceae > Rhododendron > Rhododendron groenlandicum

Rhododendron groenlandicum (rusty labrador-tea; bog Labrador tea)

Synonyms: Ledum canadense; Ledum groenlandicum; Ledum latifolium; Ledum palustre; Ledum palustre subsp. groenlandicum; Ledum palustre var. latifolium

Wikipedia Abstract

Rhododendron groenlandicum (bog Labrador tea, formerly Ledum groenlandicum or Ledum latifolium), is a flowering shrub with white flowers and evergreen leaves that is used to make a herbal tea.It is a low shrub growing to 50 centimetres (20 in) (rarely up to 2 metres (6 ft 7 in)) tall with evergreen leaves 20–60 millimetres (0.79–2.36 in) long and 3–15 millimetres (0.12–0.59 in) broad.
View Wikipedia Record: Rhododendron groenlandicum


Height [3]  4.9 feet (1.5 m)
Width [3]  4.9 feet (1.5 m)
Allergen Potential [1]  Medium
Screening - Summer [2]  Moderate
Screening - Winter [2]  Porous
Hardiness Zone Minimum [2]  USDA Zone: 3 Low Temperature: -40 F° (-40 C°) → -30 F° (-34.4 C°)
Light Preference [2]  Mixed Sun/Shade
Soil Acidity [2]  Moderate Acid
Soil Fertility [2]  Infertile
Water Use [2]  Moderate
Flower Color [2]  White
Foliage Color [2]  Gray-Green
Bloom Period [2]  Late Spring
Drought Tolerance [2]  Medium
Edible [3]  May be edible. See the Plants For A Future link below for details.
Fire Tolerance [2]  Medium
Flower Type [3]  Hermaphrodite
Frost Free Days [2]  3 months 5 days
Fruit/Seed Abundance [2]  Medium
Fruit/Seed Begin [2]  Spring
Fruit/Seed End [2]  Summer
Growth Form [2]  Multiple Stem
Growth Period [2]  Spring
Growth Rate [2]  Slow
Hazards [3]  Plants contain a narcotic toxin called Ledel. This toxin only causes problems if the leaves are cooked for a long period in a closed container;
Leaf Type [3]  Evergreen
Lifespan [2]  Perennial
Pollinators [3]  Bees
Propagation [2]  Bare Root, Container, Seed
Root Depth [2]  18 inches (46 cm)
Scent [3]  The small white flowers are aromatic.
Seed Spread Rate [2]  Slow
Seed Vigor [2]  Medium
Shape/Orientation [2]  Erect
Structure [3]  Shrub
Usage [3]  The leaves are hung up in the clothes cupboard in order to repel insects; The branches are also placed among grain in order to keep mice away; A strong decoction of the leaves, or a tincture, is used to kill lice, mosquitoes, fleas and other insects; The leaves contain tannin; A brown dye is obtained from the plant;
Vegetative Spread Rate [2]  None
View Plants For A Future Record : Rhododendron groenlandicum

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Acadia National Park II 35996 Maine, United States
Algonquin Provincial Park IV 1868802 Ontario, Canada
Banff National Park II 1690912 Alberta, Canada
Bruce Peninsula National Park II   Ontario, Canada
Cape Breton Highlands National Park II 234333 Nova Scotia, Canada  
Denali Biosphere Reserve 1932364 Alaska, United States
Elk Island National Park II 47171 Alberta, Canada
Fire Island National Seashore V 9433 New York, United States
Forillon National Park II 61010 Quebec, Canada  
Fundy National Park II 52716 New Brunswick, Canada
Gates of the Arctic National Park Ib 184461 Alaska, United States
Glacier Bay National Park and Preserve Ib 591068 Alaska, United States
Glacier National Park II 953799 Montana, United States
Gros Morne National Park II 476632 Newfoundland, Canada
Gwaii Haanas National Park Reserve II 366714 British Columbia, Canada
Isle Royale Biosphere Reserve Ib 571799 Michigan, United States
Ivvavik National Park II 2382752 Yukon, Canada
Jasper National Park II 2776809 Alberta, Canada
Kejimkujik National Park II 94203 Nova Scotia, Canada
Kluane National Park and Reserve National Park Reserve II 5463436 Yukon, Canada
Kootenay National Park II 341762 British Columbia, Canada
Kouchibouguac National Park II 59161 New Brunswick, Canada
La Mauricie National Park II 131706 Quebec, Canada
Lake Superior Provincial Park IV 351011 Ontario, Canada
Mingan Archipelago National Park Reserve II 20461 Quebec, Canada
Mount Revelstoke National Park Ia 18 British Columbia, Canada
Nahanni National Park Reserve II 1309627 Northwest Territories, Canada
Niagara Escarpment Biosphere Reserve 470167 Ontario, Canada  
Noatak Biosphere Reserve 7500143 Alaska, United States  
Olympic Biosphere Reserve II 922805 Washington, United States
Pacific Rim National Park Reserve II 137900 British Columbia, Canada
Polar Bear Provincial Park 5502026 Ontario, Canada
Prince Albert National Park II 976762 Saskatchewan, Canada
Prince Edward Island National Park II   Prince Edward Island, Canada  
Pukaskwa National Park II 459860 Ontario, Canada
Riding Mountain Biosphere Reserve II 762028 Manitoba, Canada
Terra Nova National Park IV 125894 Newfoundland, Canada
Vuntut National Park II 1076795 Yukon, Canada
Wapusk National Park II 2614324 Manitoba, Canada
Winisk River Provincial Park II 434735 Ontario, Canada
Wood Buffalo National Park II 11038545 Alberta, Canada
Woodland Caribou Provincial Wilderness Park Provincial Park II 1072124 Ontario, Canada
Yoho National Park II 317576 British Columbia, Canada



Adelges abietis (Aphid)[4]
Coleophora ledi[5]
Epinotia septemberana[5]
Eugraphe subrosea <Unverified Name>[6]
Lepus americanus (Snowshoe Hare)[4]
Lithomoia solidaginis (goldenrod brindle)[5]
Melanchra assimilis[5]
Nipaecoccus ledi[7]
Syngrapha microgamma (Little Bride Looper Moth)[5]
Syngrapha montana (Labrador Tea Looper)[5]


Pollinated by 
Andrena alleghaniensis[8]
Andrena carlini (Mining bee)[8]
Andrena carolina[8]
Andrena mandibularis[8]
Andrena regularis[8]
Andrena vicina[8]
Bombus impatiens[8]
Bombus sandersoni[8]
Bombus ternarius (Orange-belted Bumblebee)[8]
Bombus terricola[8]
Colletes inaequalis[8]
Eristalis dimidiata[8]
Helophilus fasciatus[8]
Helophilus latifrons[8]
Parhelophilus laetus[8]
Platycheirus rosarum[8]
Sericomyia transversa[8]


North America;



Attributes / relations provided by
1Derived from Allergy-Free Gardening OPALS™, Thomas Leo Ogren (2000)
2USDA Plants Database, U. S. Department of Agriculture
3Plants For A Future licensed under a Creative Commons License
4Making The Forest And Tundra Wildlife Connection
5HOSTS - a Database of the World's Lepidopteran Hostplants Gaden S. Robinson, Phillip R. Ackery, Ian J. Kitching, George W. Beccaloni AND Luis M. Hernández
6Biological Records Centre Database of Insects and their Food Plants
7Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P. ScaleNet 4 November 2009
8Small, E. 1976. Insect pollinators of the Mer Bleue peat bog of Ottawa. Canadian Field Naturalist 90:22-28.
Images provided by Google Image Search
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access