Volcanic sorrel

Oxalis vulcanicola 'Zinfandel'

Photo/Illustration: 
Bill Johnson
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Volcanic sorrel (Oxalis vulcanicola 'Zinfandel')
oks-AL-iss vul-kan-IK-oh-lah
Genus:  Oxalis

The old-fashioned shamrock house­plant is now high fashion. Several introductions from Proven Winners push this group to the fore for its elegant foliage; abundant, delicate flowers; and vigor. Only 6 to 10 inches high with a spread to 12 inches, this plant’s tiny, ¾-inch-wide, bronze-colored leaf clusters and bright yellow flowers are massed on trailing stems that spill over the sides of shaded window boxes and containers.

Noteworthy Characteristics:  Nice houseplant.
Care:  Though this shamrock is frost tender, it is easy to overwinter indoors.
Propagation:  Sow fresh seed or divide rhizomes. 
Problems:  Fungal leaf spots, powdery mildew, rust, and seed smut are the most common problems, but also watch for spider mites and leaf miners. 

Overview

Height
6 in. to 12 in.
Spread
1 ft. to 3 ft.
Growth Habit
Clumps
Growth Pace
Moderate Grower
Light
Full Sun Only
Moisture
Medium Moisture
Maintenance
Low
Characteristics
Showy Foliage
Bloom Time
Early Spring,
Early Summer,
Late Spring,
Late Summer,
Spring,
Summer
Flower Color
Yellow Flower
Foliage Color
Colorful/Burgundy Foliage
Uses
Beds and Borders,
Container,
Combinations,
Ground Covers
Style
Cottage Garden,
Suitable as Annual,
Woodland Garden
Seasonal Interest
Summer Interest
Type
Perennials

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