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Grindelia squarrosa - (Pursh.)Dunal.
                 
Common Name Rosin Weed, Curlycup gumweed
Family Asteraceae or Compositae
USDA hardiness 3-7
Known Hazards The plant contains the carcinogen safrole[274].
Habitats Prairies, plains and dry banks[4, 43].
Range N. America - Minnesota to British Columbia, south to California and Texas.
Edibility Rating  
Other Uses  
Weed Potential Yes
Medicinal Rating  
Care
Fully Hardy Well drained soil Moist Soil Full sun

Summary

Grindelia squarrosa Rosin Weed, Curlycup gumweed


http://commons.wikimedia.org/wiki/User:Miwasatoshi
Grindelia squarrosa Rosin Weed, Curlycup gumweed
http://commons.wikimedia.org/wiki/User:Maylett
   
Physical Characteristics
 icon of manicon of flower
Grindelia squarrosa is a BIENNIAL/PERENNIAL growing to 1 m (3ft 3in).
It is hardy to zone (UK) 3. It is in flower from Jul to September. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects.Suitable for: light (sandy) and medium (loamy) soils, prefers well-drained soil and can grow in nutritionally poor soil. Suitable pH: acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought.

Synonyms

Habitats
 Cultivated Beds;
Edible Uses
Edible Parts:
Edible Uses: Gum;  Tea.

The fresh or dried leaves can be used to make an aromatic, slightly bitter but pleasing tea[183]. A sticky resinous sap that covers the leaves can be used as a chewing gum substitute[183].
Medicinal Uses


Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Antispasmodic;  Expectorant;  Homeopathy;  Poultice;  Sedative.

Rosin weed was used by the native North American Indians to treat bronchial problems and also skin afflictions such as reactions to poison ivy[254]. It is still used in modern herbalism where it is valued especially as a treatment for bronchial asthma and for states where phlegm in the airways impedes respiration[254]. In addition, it is believed to desensitize the nerve endings in the bronchial tree and slow the heart rate, thus leading to easier breathing[254]. The plant merits investigation as a treatment for asthma[222]. The herb is contraindicated for patients with kidney or heart complaints[254]. The dried leaves and flowering tops are antiasthmatic, anti-inflammatory, antispasmodic, expectorant and sedative[4, 46, 207, 212, 238, 254]. The principal use of this herb is in the treatment of bronchial catarrh, especially when there is an asthmatic tendency, it is also used to treat whooping cough and cystitis[4, 254]. The active principle is excreted from the kidneys, and this sometimes produces signs of renal irritation[4, 238]. Externally, the plant is used as a poultice to treat burns, poison ivy rash, dermatitis, eczema and skin eruptions[212, 213, 222, 238]. The plant is harvested when in full bloom and can be used fresh as a poultice or dried for infusions etc[254]. A fluid extract is prepared by placing the freshly gathered leaves and flowers in a small quantity of simmering water for about 15 minutes[213]. A homeopathic remedy is prepared from the leaves and flowering stems[4].
Other Uses
Dye;  Gum.

Yellow and green dyes are obtained from the flowering heads and pods[168]. Aromatic.
Cultivation details
Industrial Crop: Hydrocarbon;  Management: Hay;  Wild Crop.

Succeeds in any well-drained soil in full sun[200]. Does well on dry sandy banks and in poor soils[200]. Prefers a peaty loam soil[1]. This is one of the first species to invade disturbed or denuded ground and often becomes a serious weed of grazing land[212]. A very polymorphic plant[43].
Propagation
Seed - sow autumn or spring in a cool greenhouse and only just cover the seed. Prick out the plants into individual pots when they are large enough to handle and plant them out into their permanent positions in early summer. Division as new growth commences in the spring. Very easy, larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring. Cuttings.
Other Names
Found In
Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status
IUCN Red List of Threatened Plants Status :
Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Grindelia camporumGumplant, Great Valley gumweed, Bract gumweed03
Grindelia humilisHairy Gumweed02
Grindelia lanceolataRosin Weed, Narrowleaf gumweed, Texan gumweed13
Grindelia robustaGreat Valley Gumweed12
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Author
(Pursh.)Dunal.
Botanical References
43200
Links / References
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Subject : Grindelia squarrosa  

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