Giant Dutchman's pipe (Aristolochia gigantea) | seeds, 10 pcs.

• Latin name: Aristolochia gigantea
• Danish names: Giant Dutchman's pipe
  
• English names: Brazilian Dutchman's pipe, giant pelican flower

Aristolochia gigantea is a spectacular tropical climber from Brazil, known for its very large and unusual flowers. The species is among the most striking in the genus and is grown especially for its decorative, broadly unfolded flowers, which are often dark purple with fine, net-like patterns and a warm, velvety glow.

The plant develops long, vigorous climbing shoots and large, heart-shaped leaves, which quickly create a lush and exotic appearance. The flowers are flat and broad in shape and can become impressively large. They emit a characteristic scent that, in nature, attracts flies and other pollinators. As with other species in the genus, the flower is specialized to lure and temporarily trap pollinators until pollination is complete.

Compared to Aristolochia grandiflora, Aristolochia gigantea typically has a more round, broad, and flat flower, while A. grandiflora often appears more elongated and dramatic with a distinct tail. The two species resemble each other in growth habit and cultivation, but their floral appearance is distinct enough that both are exciting in a collection.

Cultivation and requirements

Aristolochia gigantea thrives best in a very bright location, preferably with some sun during the day, and prefers:

• nutrient-rich, humus-rich, and well-drained soil
• even watering during the growing season
• good organic fertilizer during the growing season
• warmth and high humidity
• support for climbing

The plant is not frost-tolerant and in Denmark is best grown as a container plant, in a greenhouse, conservatory, or another bright and warm environment. It can be kept outdoors during the summer months in a warm and sheltered spot, but must be overwintered frost-free. The temperature should preferably be kept above 12–15 °C.

Cultivation from seeds

Seeds of Aristolochia gigantea are sown in a light, humus-rich, and well-drained soil mix and covered lightly. Soaking in lukewarm water for 12–24 hours before sowing can promote germination.

For best results, we recommend:

• a temperature of 22–28 °C
• high humidity
• evenly moist, but not soggy soil

Germination typically occurs within 2–8 weeks but can be uneven. The young plants usually grow relatively quickly in warm conditions and early on develop climbing shoots that need support. Flowering is usually only achieved on more mature plants.

Utility and collector value

Aristolochia gigantea is primarily grown as an ornamental and collector's plant. It is especially the flowers that make the species so sought-after – large, distinctive, and almost artificial in their appearance.

For collectors of tropical climbers, the species is an obvious counterpart to Aristolochia grandiflora. Where A. grandiflora is often more dramatic and elongated in the flower, A. gigantea offers a broader and flatter floral expression. Together, they represent some of the most fascinating species in the genus.

Aristolochia gigantea is an obvious choice for the patient plant enthusiast who wants to grow an unusual and tropical climber from seed – with spectacular flowers and great collector value.