Tragopogon Species, Common Salsify, Jerusalem Star, Oysterplant, Purple Goatsbeard

Tragopogon porrifolius

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Tragopogon (tra-go-POH-gon) (Info)
Species: porrifolius (po-ree-FOH-lee-us) (Info)



Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade


Grown for foliage

Foliage Color:

Unknown - Tell us


24-36 in. (60-90 cm)


12-15 in. (30-38 cm)


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)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Where to Grow:

Grow outdoors year-round in hardiness zone



Bloom Color:


Medium Purple

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

From seed; direct sow outdoors in fall

Direct sow as soon as the ground can be worked

From seed; direct sow after last frost

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Seed does not store well; sow as soon as possible


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

Arroyo Grande, California

Claremont, California

Folsom, California

Hayward, California

Imperial Beach, California

Marysville, California

Merced, California

Oakland, California

Vacaville, California(2 reports)

Blue Springs, Missouri

Neptune, New Jersey

Tonawanda, New York

Norman, Oklahoma

Ashland, Oregon

Greencastle, Pennsylvania

Temple, Texas

Wild Rose, Wisconsin

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Gardeners' Notes:


On Apr 28, 2019, rwgless from Marysville, CA wrote:

I always wondered what these were growing in my backyard ... now I know ... They Grow up here in northern California really well... get about 2 feet tall if you let them grow.


On Dec 30, 2015, BotanyDave from Norman, OK (Zone 7a) wrote:

Decided to plant a few seeds in my backyard to compliment my wild transplants of a related species. After 2 years (they're biennial), and upon flowering, I tried to cross-pollinate the two- and succeeded! "Tragopogon mirus" was the result (the cross has been previously recognized as occurring in North America, but not where their native ranges overlap in Europe), and has traits of both parent species (and is polyploidy)!

Luckily, they are still tasty!

Synthetic polyploids of Tragopogon miscellus and T. mirus (Asteraceae): 60 Years after Ownbey's discovery. American Journal of Botany, 2009, 96: 979-988.

I am eagerly awaiting for the hybrids shown in figure 4 to show up in my yard (what with all the seeds being produced).


On Jun 3, 2013, ClimbTheMtns from Walnut Creek, CA wrote:

Salsify has become one of my new most favorite plants. It's spherical seed head is astoundingly symmetrical. It self-seeds like there's no tomorrow. And it requires so little water.


On Dec 30, 2008, Robubba from Moulton, IA wrote:

Salsify helps carrots, lettuce, onions, and leeks in companion planting.


On Jul 22, 2004, wilsweb from London,
United Kingdom wrote:

There is a growing area of salsify in the India Dock basin bird sanctuary next to the Thames in London.

The plant does indeed close its petals around noon. The alternative name Oyster plant is because the edible root is supposed to smell like oysters! The salsify is white rooted while its relative scorzonera has blackish roots.