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Publication #FPS156

Crinum x amabile Giant Spider Lily1

Edward F. Gilman2

Introduction

The Giant Spider Lily is a herbaceous perennial that rises from a 3 to 4 1/2-inch thick, fleshy bulb (Fig. 1). The linear, leathery leaves grow in a rosette. These glossy leaves are greenish-red and reach a length of 2 to 4 feet. Red and pink fragrant flowers sit atop a succulent, cylindrical flower stalk that is 1 to 3 feet tall. A 6-inch-long floral tube bears 6 petals and sepals, and rosy stamens from the throat of this tube. These striking, fragrant flowers appear most abundantly in the spring, summer and fall seasons of the year. The fruits of the Swamp Lily are lobed seed capsules that are 1 ½ to 2 inches thick.

General Information

Figure 1. 

Giant Spider-Lily.


[Click thumbnail to enlarge.]
Scientific name: Crinum x amabile
Pronunciation: KRYE-num x uh-MAB-ill-lee
Common name(s): Giant Spider-Lily
Family: Amaryllidaceae
Plant type: bulb/tuber; perennial; herbaceous
USDA hardiness zones: 8B through 11 (Fig. 2)
Planting month for zone 8: year round
Planting month for zone 9: year round
Planting month for zone 10 and 11: year round
Origin: not native to North America
Uses: mass planting; specimen; accent
Figure 2. 

Shaded area represents potential planting range.


[Click thumbnail to enlarge.]
Availability: generally available in many areas within its hardiness range

Description

Height: 3 to 5 feet
Spread: 3 to 5 feet
Plant habit: spreading
Plant density: open
Growth rate: moderate
Texture: coarse

Foliage

Leaf arrangement: spiral
Leaf type: simple
Leaf margin: entire
Leaf shape: linear
Leaf venation: parallel
Leaf type and persistence: evergreen
Leaf blade length: more than 36 inches
Leaf color: purple or red
Fall color: no fall color change
Fall characteristic: not showy

Flower

Flower color: purple; red
Flower characteristic: year-round flowering; pleasant fragrance

Fruit

Fruit shape: round
Fruit length: 1 to 3 inches
Fruit cover: dry or hard
Fruit color: green
Fruit characteristic: showy

Trunk and Branches

Trunk/bark/branches: not particularly showy; usually with one stem/trunk
Current year stem/twig color: not applicable
Current year stem/twig thickness: not applicable

Culture

Light requirement: plant grows in part shade/part sun
Soil tolerances: extended flooding; clay; sand; acidic; slightly alkaline; loam
Drought tolerance: moderate
Soil salt tolerances: unknown
Plant spacing: 36 to 60 inches

Other

Roots: usually not a problem
Winter interest: plant has winter interest due to unusual form, nice persistent fruits, showy winter trunk, or winter flowers
Outstanding plant: plant has outstanding ornamental features and could be planted more
Invasive potential: not known to be invasive
Pest resistance: long-term health usually not affected by pests

Use and Management

Planted in mass, Giant Spider Lily forms an attractive tall ground cover and is lovely when used as an edge or border around a pool of water. It is often planted alone in a small landscape as a specimen to accent an area. Locate it near a walk or patio to enjoy the fragrant flowers.

This Lily is best grown in soils that are moderately moist. Irrigation during dry weather, especially in the summer, is recommended. Plant this lily in full sun to partial shade for best growth and flowering. The Giant Spider Lily is moderately tolerant of salt spray and will grow well in coastal communities away from the direct salt spray.

Pests and Diseases

Leaf spot disease appears to be the biggest problem.

Footnotes

1.

This document is FPS156, one of a series of the Environmental Horticulture, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date October 1999. Revised June 2007. Reviewed June 2011. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Edward F. Gilman, professor, Environmental Horticulture Department, Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.