Iochroma, Tubeflower, Violet Churur 'Royal Queen'

Iochroma cyanea

Family: Solanaceae (so-lan-AY-see-ee) (Info)
Genus: Iochroma (eye-oh-KROH-muh) (Info)
Species: cyanea (sy-AN-ee-uh) (Info)
Cultivar: Royal Queen




Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade



Foliage Color:

Unknown - Tell us


24-36 in. (60-90 cm)


Unknown - Tell us


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)

USDA Zone 11: above 4.5 C (40 F)

Where to Grow:

Can be grown as an annual


Seed is poisonous if ingested

Parts of plant are poisonous if ingested

All parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Medium Purple

Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Blooms all year

Blooms repeatedly

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

Patent Information:

Unknown - Tell us

Propagation Methods:

From semi-hardwood cuttings

From seed; winter sow in vented containers, coldframe or unheated greenhouse

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds


This plant is said to grow outdoors in the following regions:

Fountain Valley, California

Brooksville, Florida

Chattahoochee, Florida

Ocala, Florida

Palm Coast, Florida

Sarasota, Florida

Winter Springs, Florida

Warner Robins, Georgia

Lafayette, Louisiana

Mandeville, Louisiana

Youngsville, Louisiana

Elizabeth City, North Carolina

West Chester, Pennsylvania

Wilkes Barre, Pennsylvania

Ladys Island, South Carolina

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Gardeners' Notes:


On Jan 28, 2013, virginiarose from Portsmouth, VA (Zone 8a) wrote:

Proven Winners has this listed as an annual for zone 9-11.


On Jul 30, 2011, luvtogardin from Fountain Valley, CA wrote:

I have really enjoyed growing this plant (Orange County, CA.) I planted it last summer and it stayed rather small (1 gallon). I used shrub fertilizer stakes in the spring and this summer it has grown to about 8' x 8' with arching branches. Much larger than size noted on Proven Winners plant stake (5'x4'). Large, beautiful clusters of purple tube flowers that the hummers love. Do not over water!!


On Apr 30, 2009, Queenbilen from West Chester, PA wrote:

I was given one of these to trial last spring from Athens, the distributor, and it thought it was a fabulous plant! The color of the flower was outstanding and it grew beautifully, despite our droughty summer. I only wish it were a perennial here in PA. I also wish I knew where to get more of them. I hope they will be more readily available soon. One note of caution: like its relative Brugmansia, all parts of this plant are poisonous and some people may develop a rash from handling it.


On Sep 11, 2008, Citrinus from Bridgwater,
United Kingdom wrote:

This plant is a product of the Athens Select programme at UGA. Although the Athens Select website is slightly ambiguous as to the name, the correct name is Iochroma cyaneum 'Purple Queen' rather than 'Royal Queen'. It is similar to but distinct from the USDA recognised cultivar Iochroma cyaneum 'Indigo'.