Photo by Melody

PlantFiles: Clammy Cuphea, Blue Waxweed, Tarweed
Cuphea viscosissima

Family: Lythraceae (ly-THRAY-see-ee) (Info)
Genus: Cuphea (KYOO-fee-uh) (Info)
Species: viscosissima (vis-kos-ISS-ih-muh) (Info)

Synonym:Cuphea petiolata
Synonym:Parsonsia petiolata

One vendor has this plant for sale.

5 members have or want this plant for trade.


Unknown - Tell us

Unknown - Tell us

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)

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:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
This plant may be considered a protected species; check before digging or gathering seeds

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Collect seedhead/pod when flowers fade; allow to dry
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By Sherlock_Holmes
Thumbnail #1 of Cuphea viscosissima by Sherlock_Holmes

By AnniesAnnuals
Thumbnail #2 of Cuphea viscosissima by AnniesAnnuals


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive BlueBarnLdy On Oct 19, 2008, BlueBarnLdy from Elsberry, MO (Zone 5a) wrote:

I bought this plant on a whim at a native plant sale. I was not impressed at first, but in mid summer it grew into a compact globe shaped plant with masses of tiny purple flowers. It produces LOTS of seeds, so I'm a little concerned about it self-seeding too much. Would be great in a rock garden where a low mounding plant is desired.

Positive Equilibrium On Jan 29, 2006, Equilibrium wrote:

First off, this is a rather attractive plant with interesting flowers. Allegedly, this plant is currently being tested for any possible cancer fighting properties it might have so I'd say to leave this plant alone if you ever find it growing in the wild.


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

Richmond, California
Elsberry, Missouri
Millersburg, Pennsylvania

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