General Plant Information (Edit)
|Soil pH Preferences:
||Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
|Minimum cold hardiness:
||Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
|Maximum recommended zone:
||36 - 100 inches
||36 - 48 inches
||Other: basal leaves up to 1 foot long
||Edible to birds
Late summer or early fall
||Stratify seeds: 3 months at 40 degrees
||Not suitable for containers
||Tolerates poor soil
||Least Concern (LC)
- Compass Plant
- Turpentine Plant
- Gum Weed
- Cut-leaf Silphium
- Pilot Weed
- Accepted: Silphium laciniatum
- Synonym: Silphium laciniatum var. robinsonii
- Synonym: Silphium laciniatum var. laciniatum
Posted by ILPARW
(southeast Pennsylvania - Zone 6b) on Feb 17, 2018 8:43 PM concerning plant:
This very tall perennial gets its name from the thick, sharply lobed leaves orienting themselves in a north-south direction. it is slow growing and very long lived. Big plants can have up to 100 flowers. It is a major prairie plant in a native range from North Dakota & Minnesota through Michigan and then southward into the deep South and even a little into New Mexico. The Lurie Garden in downtown Chicago has some spread around in their huge naturalistic garden. This is sold by many native plant nurseries for prairie restorations and for naturalistic native plant landscapes.
Posted by jmorth
(central Illinois) on Dec 26, 2011 1:18 PM concerning plant:
The deeply cut large basal leaves are commonly oriented in the N - S direction, hence the name. A common Illinois wildflower partial to prairie habitats and along RR right of ways.
Stem leaves are smaller alternate and tend to clasp the stem. Flower heads are up to 4.5" across w/ 20 to 30 petal-like ray flowers around a central yellow disk.
Omaha and Ponca Indians were reluctant to camp near these plants because they thought the plant attracted lightning. They sometimes burned the plant's dried roots during heavy electrical storm manifestation thinking it a charm against lightning strike.
Root thought to alleviate head colds and head pains by some tribes and early settlers. Dried leaves used to treat dry, persistent coughs and intermittent fevers.
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||On August 1, 2023
A word of caution. Extremely invasive. Planted Silphium by our pond in a 4B sunny zone in 2000, and to this date it has taken over the entire area it was planted in. The roots are so deep and extensive it would need a tractor to uproot it..
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