Scientific: Syagrus romanzoffiana (formerly S. romanzoffianum, Arecastrum romanzoffianum or Cocus plumosa)
Common: Queen palm
Family: Arecaceae
Origin: South America from Argentina, Paraguay, Uruguay, Bolivia, into Brazil.

Pronounciation: See-A-grus ro-man-zof-fee-A-na

Hardiness zones
Sunset
12, 13, 15-17, 19-24
USDA 9 (may struggle)-11

Landscape Use: Focal point, strong accent, vertical statement, tropical effect, good around water, bad in the dry desert air.

Form & Character: Evergreen palm, upright yet graceful.

Growth Habit: Moderately fast to 50 feet, though rarely above 30 feet in Phoenix.

Foliage/texture: Long, arching pinnately compound fronds to 10 feet with distinct frond sheaths and up to 200 leaflets per leaf, bright glossy green, partially self-shedding to reveal smooth light very straight gray trunk with prominent frond sheath scars; coarse texture.

Flowers & fruits: Flowers are yellow to 3/8 inch long in long panicled, clusters, fruit are yellow to orange and are from 1 to 1.5 inches long in an ovoid shape, clustered.

Seasonal color: None
Temperature:
Hardy to 25oF, killed at about 16oF.

Light: Full sun to partial shade, avoid western exposures, eastern exposires best.

Soil: Avoid rocky alkaline soils (hard to do in Phoenix) because of severe iron chlorosis problems. Queen palms in Phoenix need a regular nutritional program that includes supplemental micronutrients (Fe, Zn, and Mn) and magnesium (Epsom salts) fertilizers.

Watering: Regular

Pruning: Removal of old fronds.

Propagation: Seed

Disease and pests: Mites, phytophthora root rot, ganoderma butt rot (enters through lower trunk wounds, no control), rarely palm leaf skeletonizer and scale.

Additional comments: As palms go, queen palm is a bad choice for the Phoenix area because of it's sensitivity to winter cold, summer heat and alkaline soils. Also, frond tatter is a locally universal problem due to high transpirational water loss and drying winds. Otherwise, queen palm is a very graceful palm that is much better suited for landscape use in south Florida and coastal southern California. In Phoenix, queen palm is hardier than king palm (though frankly in Phoenix that's not saying very much).