Water Willow, Swamp Loosestrife

Decodonverticillatus

Family
Lythraceae (ly-THRAY-see-ee)
Genus
Decodon (DEK-oh-don)
Species
verticillatus (ver-ti-si-LAH-tus)
Synonym
Sun Exposure
Sun to Partial Shade
Foliage
Smooth
Height
4-6 ft. (1.2-1.8 m)
Spacing
36-48 in. (90-120 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
Pink
Bloom Time
Mid Summer
Other Details
Category
Ponds and Aquatics
Water Requirements
Very high moisture needs; suitable for bogs and water gardens
Foliage Color
Blue-Green
Where to Grow
Bloom Characteristics
Bloom Size
Other details
May be a noxious weed or invasive
Soil pH requirements
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Patent Information
Non-patented
Propagation Methods
From softwood cuttings
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:

Miccosukee Cpo, Florida

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Gardener's Notes:

0
positive
2
neutrals
0
negative
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C
ROSLINDALE, MA | December 2014 | neutral

In eastern North America, where it's native, this is not the ecological threat that its relation purple loosestrife can be. However, it's...Read More

T
T
Murfreesboro, TN (Zone 7a) | August 2001 | neutral

This plant is related to the highly invasive Loosestrife species; however, it is easier to contain and can be ethically cultivated. It h...Read More

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