Photo by Melody

PlantFiles: Iochroma
Iochroma cyanea 'Royal Queen'

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

One vendor has this plant for sale.

11 members have or want this plant for trade.


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)

Sun Exposure:
Sun to Partial Shade

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:

Bloom Time:
Blooms all year
Blooms repeatedly


Other details:
Average Water Needs; Water regularly; do not overwater
Suitable for growing in containers

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

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2 positives
2 neutrals
No negatives

Gardeners' Notes:

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

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

Positive luvtogardin 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!!

Positive Queenbilen 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.

Neutral Citrinus 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'.


This plant has been said to grow 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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