Photo by Melody

PlantFiles: Dense-Flowered Loosestrife
Lysimachia congestiflora 'Outback Sunset'

Family: Primulaceae
Genus: Lysimachia (ly-si-MAK-ee-uh) (Info)
Species: congestiflora (kon-jes-tih-FLOR-uh) (Info)
Cultivar: Outback Sunset

One vendor has this plant for sale.

2 members have or want this plant for trade.


under 6 in. (15 cm)

12-15 in. (30-38 cm)

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)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Bright Yellow

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

Grown for foliage

Other details:
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Click thumbnail
to view:

By Happenstance
Thumbnail #1 of Lysimachia congestiflora by Happenstance

By JeanneTX
Thumbnail #2 of Lysimachia congestiflora by JeanneTX


2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive gardenergirl678 On Apr 10, 2011, gardenergirl678 from Hamilton, GA (Zone 8a) wrote:

Great groundcover for high shade as well as sun. This cultivar and 'Goldilocks' brighten shady areas, dry and wet. I give it a 10!

Positive JeanneTX On May 9, 2009, JeanneTX from Willis, TX (Zone 8b) wrote:

This plant makes a fantastic Ground cover and always in bloom

Neutral lupinelover On Feb 1, 2003, lupinelover from Grove City, OH (Zone 6a) wrote:

Do not cover seeds when planting.

Saved seed will not come true.


This plant has been said to grow in the following regions:

Auburn, California
Clayton, California
Bradenton, Florida
Pompano Beach, Florida
Hamilton, Georgia
Glen Head, New York
Summerville, South Carolina
Willis, Texas
Norfolk, Virginia

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