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Chlorogalum spp.
soap plant
Overview
Chlorogalum spp. is a genus of about five bulbous perennials in the family Asparagaceae, native to the western United States, especially California, where they are called soap plants or soaproot. Plants grow from large bulbs wrapped in coarse brown fibers and produce a basal rosette of long, narrow leaves with strongly wavy margins, 8-28 inches (20-70 cm) long. In late spring and summer, a tall, widely branched flowering stalk rises 1.5-8 feet (0.5-2.5 m) depending on species, carrying many small, star-shaped flowers with six tepals in white, sometimes tinged pink or blue, often marked with green or purple midveins. In several species the flowers open in late afternoon and evening and close by the following morning, each lasting a single day. The bulbs contain saponins and were crushed and used as soap and as a fish poison by Indigenous peoples of California. C. pomeridianum is the largest species and the one most often encountered. One limitation in cultivation is the brief daily flower display and a summer-dormant habit that leaves a bare gap once the foliage dies back. Most species suit zones 7-10 with dry summers.
Native Range
Chlorogalum spp. is native to the western United States, centered in California and extending into Oregon, with species in coastal hills, grasslands, chaparral, and dry open woodland. Plants grow where summers are dry and winters mild and wet.Suggested Uses
Used in native-plant gardens, dry meadows, and naturalized plantings in summer-dry climates. The tall, airy flower stalks suit the back of borders and wildlife plantings where evening-flying pollinators are active. Suited to regions with Mediterranean-type rainfall rather than summer-wet gardens.How to Identify
Appearance
Size & Dimensions
Height1'6" - 8'
Width/Spread1' - 2'
Bloom Information
Flowering occurs from late spring into summer, roughly May to July depending on species and elevation. In C. pomeridianum and several others the flowers open in late afternoon and evening and close by morning, with new flowers opening over many weeks. The leaves often wither before flowering finishes.
Detailed Descriptions
Flower Description
white with green or purple midveinsFoliage Description
greenGrowing Conditions
Sun Requirements
Requires 6-12 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight