Hardy Gloxinia

Incarvillea delavayi

Family: Bignoniaceae (big-no-nih-AY-see-ee) (Info)
Genus: Incarvillea (in-kar-VIL-ee-uh) (Info)
Species: delavayi (del-uh-VAY-ee) (Info)



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Suitable for growing in containers

This plant is suitable for growing indoors


18-24 in. (45-60 cm)


12-15 in. (30-38 cm)


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)

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:


White/Near White

Bloom Time:

Late Spring/Early Summer

Mid Summer


Grown for foliage



Other details:

Unknown - Tell us

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:


Propagation Methods:

From seed; sow indoors before last frost

From seed; direct sow after last frost

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Seed does not store well; sow as soon as possible


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

Calistoga, California

Miami, Florida

Wellborn, Florida

Chicago, Illinois

Bellaire, Michigan

Florence, Mississippi

Mayview, Missouri

Tuckerton, New Jersey

Hannibal, New York

Glouster, Ohio

Walterville, Oregon

Verona, Pennsylvania

Conway, South Carolina

Leesburg, Virginia

Kalama, Washington

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Gardeners' Notes:


On Sep 7, 2010, braun06 from Peoria Heights, IL (Zone 5b) wrote:

I planted this from some roots I bought at the store and they flowered however they never looked good through the whole growing season. I wound up yanking them and they hardly rooted which is fine to me since I didn't like the plant to begin with.


On Jan 11, 2010, holeth from Corpus Christi, TX (Zone 9a) wrote:

Opened the Sunday paper this week. A popular corporate bulb company is adding a common name to this plant. They're marketing it under the name "Flowering Fern."

Found scientific/botanical name in tiny italic print on bottom of online catalog listing - not mentioned in general publicity. (01/11/2010)


On Sep 23, 2004, PurplePansies from Deal, NJ (Zone 7a) wrote:

Very easy from seed..... fast and complete germination.... now I just have to wait for the plants to grow up!!!! :)


On Aug 31, 2001, Sis wrote:

No serious pests or diseases.


On Aug 1, 2001, Deanne from Franktown, CO (Zone 5a) wrote:

Seeds need no pretreatment but need light to germinate. Do NOT cover. Takes about 14 days to germinate with soil temp at 60-65 degrees F.


On Mar 14, 2001, Terry from Murfreesboro, TN (Zone 7a) wrote:

Height: 18-24"
Spacing: 12-15"
Hardiness: Zones 6-10
Light: Sun to light shade
Pronunciation: in-kar-VIL-ee-a

Not related to gloxinias, but rather to the Campsis and Bignonia family (trumpet vines), a showy perennial from high elevations in India, Tibet and China. Carrot-like roots are available from bulb-growers in autumn. Beautiful pink blooms appear in early summer.

'Snowtop', a white-flowering variety is also available.