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PlantFiles: Venus' Looking-glass
Triodanis perfoliata

Family: Campanulaceae (kam-pan-yew-LAY-see-ee) (Info)
Genus: Triodanis (try-oh-DAY-nis) (Info)
Species: perfoliata (per-foh-lee-AY-tuh) (Info)

Synonym:Specularia perfoliata

One vendor has this plant for sale.

5 members have or want this plant for trade.


18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

18-24 in. (45-60 cm)

Not Applicable

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:

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


Other details:
May be a noxious weed or invasive
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

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

Patent Information:

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; direct sow after last frost

Seed Collecting:
Collect seedhead/pod when flowers fade; allow to dry

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2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive sallyg On May 18, 2010, sallyg from Anne Arundel,, MD (Zone 7b) wrote:

I've had this for years. it will self sow and seems to prefer my sunny bed. The seedlings in spring are cute, with unique cupping leaves, then the stems get longer and start flowering, late spring. The stem base will eventually bend and lay on the ground as the bloom continues on upright stems to a foot or so.. Near the end of bloom they are getting a bit messy and yellowed.

Positive CaptMicha On Jun 20, 2005, CaptMicha from Brookeville, MD (Zone 7a) wrote:

Venus' Looking-glass is a delightful little plant that I occassionally find in neglected parts of the yard.

It has compact little growth and bright blue/purple flowers.

I haven't found it to be very invasive but it does have to compete with some very invasive weeds, that might be saying something.


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

Morrilton, Arkansas
Brunswick, Georgia
Benton, Kentucky
Brookeville, Maryland
Millersville, Maryland
Bridgewater, Massachusetts
Blue Springs, Missouri
Neptune, New Jersey
Jay, Oklahoma
Morrisville, Pennsylvania
Charleston, South Carolina
Greenville, South Carolina
Austin, Texas
Helotes, Texas
San Antonio, Texas
Great Cacapon, West Virginia

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