Photo by Melody

PlantFiles: Purple Loosestrife
Lythrum virgatum 'The Rocket'

Family: Lythraceae (ly-THRAY-see-ee) (Info)
Genus: Lythrum (LY-thrum) (Info)
Species: virgatum (vir-GA-tum) (Info)
Cultivar: The Rocket

3 members have or want this plant for trade.


36-48 in. (90-120 cm)

24-36 in. (60-90 cm)

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)

Sun Exposure:
Full Sun
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Magenta (Pink-Purple)

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall


Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From herbaceous stem cuttings

Seed Collecting:
Unknown - Tell us


No positives
No neutrals
2 negatives

Gardeners' Notes:

Negative RubyStar On Jun 16, 2003, RubyStar from Madison, WI (Zone 5a) wrote:

Lythrum salicaria, L. virgatum, and all of their hybrids are responsible for a devastating amount of damage to North American wetlands. Even self-fertile hybrids can contribute hugely to the problem, by pollinating wild-growing stands.

Purple Loosestrife is regulated in most areas of North America, and banned in many areas.

Negative loisbb On Apr 5, 2003, loisbb wrote:

This is MUCH MORE than an Invasive PLant. It is banned from being sold in the Okanagan Area of British Columbia, Canada and I believe from the Province. It takes over wherever it is planted and kills out all other vegetation. It has taken over along Okanagan and Skaha Lake and killed off all other native vegetation. It has done the same with the Channel running through Penticton. VERY dangerous to native plantlife around waterways. Before you buy or plant this, check to make sure it is legal in your area or if it is wise. It appears that almost every entry under Purple Loosestrife from a Google search is a project dealing with how to get rid of it-all across the States as well. It took less than 10 years for the plantings on Penticton's Channel Parkway to change from varied foliage and flowers to a sea of purple. I would assume that all cultivars act in the same manner. I will take a photo this summer to add to this.

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