Silphium Species, Compass Plant, Cut-leaf Silphium, Gum Weed, Pilot Weed

Silphiumlaciniatum

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Silphium (SIL-phee-um)
Species
laciniatum (la-sin-ee-AY-tum)
Synonym
Sun Exposure
Full Sun
Foliage
Herbaceous
Height
4-6 ft. (1.2-1.8 m)
Spacing
18-24 in. (45-60 cm)
Hardiness
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
Danger
N/A
Bloom Color
Bright Yellow
Bloom Time
Late Summer/Early Fall
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored
Regional

This plant is said to grow outdoors in the following regions:

Astoria, Illinois

Chicago, Illinois

Hanna City, Illinois

Lisle, Illinois

Springfield, Illinois

Iowa City, Iowa

Calvert City, Kentucky

Florence, Mississippi

Cole Camp, Missouri

Grassy Creek, North Carolina

Glouster, Ohio

Enid, Oklahoma

Berwyn, Pennsylvania

Arlington, Texas

Princeton, Texas

Leesburg, Virginia

Appleton, Wisconsin

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Featured Videos

Gardener's Notes:

4
positives
1
neutral
0
negative
Sort By:
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R
Downingtown, PA | February 2014 | positive

It is one of the major native forbs of the Midwestern US prairie or American meadow. I see it in the restorations of prairie in the Midwe...Read More

P
Jerome, IL | August 2011 | positive

Collect the seeds early, as birds may get the best of them. May need some staking since flower heads can extend over 10 feet in height. G...Read More

F
Josephine, Arlington, TX (Zone 8a) | May 2007 | positive

Compass Plant Silphium laciniatum is a prairie flower Native to Texas and other States.

T
Mercer, PA (Zone 5a) | October 2004 | neutral

Compass plant is a long lived, tall, from 5 to 10 feet, erect perennial rising from a large tap root as deep as 15 feet.

...Read More

L
Knox City, MO | June 2004 | positive

This stately and ornamental prairie plant can be an asset for the rural or suburban gardener. I've been growing it for years, starting o...Read More

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