When we think of tubers, potatoes and yams often come to mind. But beyond the dinner table lies a dazzling world of ornamental tubers underground treasures that produce spectacular foliage, vivid blooms, or sculptural forms. These unique plants bring surprise and elegance to gardens, balconies, or indoor plant collections. From the lush jungles of Asia to arid African landscapes, here are 10 unique ornamental tubers that will give your space a fresh twist of the unexpected.
1. Caladium (Caladium bicolor)
The painter’s palette in plant form.
Caladiums are known for their stunningly colorful and patterned leaves that look like they’ve been hand-painted. Their heart-shaped foliage can display a mix of white, pink, red, and green in vibrant patterns. These tropical natives thrive in warm, humid conditions and are perfect for shade gardens or indoor containers. While their leaves are the star, the tubers themselves are hardy and can be overwintered for years of recurring beauty. They add both texture and color where blooms may be sparse.
2. Tigridia (Tigridia pavonia)
The tiger flower that’s as bold as its name.
This lesser-known Mexican native produces vibrant, three-petaled flowers with intricate speckled patterns reminiscent of a tiger’s coat. Each flower lasts only a day, but the plant produces a succession of blooms that ensure weeks of beauty. Grown from corm-like tubers, Tigridia thrives in sunny beds or containers. It’s a showstopper that brings a tropical, exotic feel, making it a great conversation starter among garden visitors.
3. Amorphophallus konjac (Voodoo Lily)
Strange, striking, and totally unforgettable.
Known for its alien-like flower and deep burgundy spathe, the voodoo lily is not your average garden plant. Its dramatic bloom, which appears before the foliage, has a powerful odor that attracts pollinators not guests. However, the dark green, umbrella-shaped leaves that follow are highly ornamental. The large, knobby tuber can grow over time, supporting ever more impressive foliage. It’s a bold, gothic choice for collectors and adventurous gardeners.
4. Dahlia (Dahlia spp.)
A classic with endless varieties and flair.
Though often grown for their bold and varied blooms, dahlias grow from underground tubers that regenerate annually. With thousands of cultivars ranging from dinner-plate sized blossoms to petite pom-poms, dahlias offer versatility and flair. Their tubers store energy for the next blooming season, making them a long-term investment in garden drama. Their rainbow of colors and diverse flower shapes make them a must-have for anyone who loves ornamental gardening.
5. Oxalis triangularis (Purple Shamrock)
Geometric beauty in purple hues.
With its striking, clover-like purple leaves and dainty white or pink flowers, Oxalis triangularis is a tuberous plant that looks like it belongs in a fairy tale. Its foliage folds up at night and opens during the day, adding dynamic movement to your space. Perfect for containers or windowsills, this tuber is low-maintenance and responds well to periods of dormancy. It’s an eye-catching addition to any decorative plant collection, indoor or out.
6. Canna Lily (Canna indica)
Bold foliage meets tropical flowers.
Cannas grow from rhizome-like tubers and are prized for both their large, paddle-shaped leaves and vibrant flowers. The foliage can be green, bronze, or even striped with reds and yellows. Their flowers resemble those of lilies, blooming in warm shades of red, orange, yellow, or pink. Cannas thrive in sunny, moist spots and can create a tropical oasis in temperate gardens. They also grow well in containers, bringing height and drama to patios.
7. Eucomis (Pineapple Lily)
A quirky cross between pineapple and orchid.
Eucomis gets its name from its pineapple-like flower structure, though it’s no relative of the tropical fruit. This South African tuber produces a spike of starry flowers topped with a leafy tuft. The rosette of leaves at the base is equally ornamental, often speckled or wavy. It blooms in mid to late summer and is ideal for pots or borders. With its unusual silhouette and long-lasting flowers, Eucomis adds whimsy and exotic appeal.
8. Bletilla striata (Chinese Ground Orchid)
The elegance of orchids, rooted in soil.
This hardy terrestrial orchid is grown from pseudobulbs technically a type of tuber and is one of the few orchids that can thrive in outdoor soil. With delicate purple-pink flowers that bloom in spring, Bletilla striata adds a refined, oriental charm to garden beds and borders. The ribbed, grassy leaves provide a lush backdrop even after flowering ends. It’s perfect for those who want the beauty of orchids without the fuss of indoor care.
9. Gloriosa superba (Glory Lily)
Climbing flames of floral beauty.
Gloriosa is a climbing vine that grows from a tuberous rootstock and produces some of the most dramatic flowers in the plant world. The recurved, flame-colored petals look as if they’re dancing in mid-air. Ideal for trellises or hanging baskets, this plant brings vertical interest and a burst of warm color. It’s a showy and exotic choice, ideal for gardeners looking to add a tropical flair to a compact space.
10. Sandersonia aurantiaca (Christmas Bells)
Delicate lanterns of joy.
Native to South Africa, Sandersonia produces small, bell-shaped orange flowers that resemble tiny Chinese lanterns. Grown from small tubers, it’s a relatively unknown gem that’s perfect for collectors and botanical enthusiasts. It blooms in mid to late summer and grows best in well-drained, warm soil. Its wiry, climbing stems make it ideal for garden trellises or stakes. The cheerful blooms and tidy form make it both unique and surprisingly easy to care for.
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