Plant of the Month for July, 2017
(air-uh-see-muh thun-BERG-ee-eye)
General Information:
Arisaema thunbergii ssp. urashima is a great aroid that adds some excitement to the garden. Known as the dominatrix jack-in-the-pulpit it appears in late spring and is gone by late summer. Its special feature is a long, dark purple, whip-like spadix that can reach 45 cm long, in true dominatrix fashion.
Arisaema thunbergii ssp. urashima by Robert Pavlis
Unlike many of its cousins, this denizen of the woods is easy to grow. Over time it makes offshoots that can be separated from the parent plant. It can also be grown from seed but may take 3-5 years to flower.
Fertilized flowers will produce red berries that mature in fall after the leaves have faded. All parts of the plant contain calcium oxalate and are poisonous.
Arisaema thunbergii ssp. urashima by Robert Pavlis
The subspecies urashima, is similar to the species, but is shorter growing to just 45 cm tall, and has 11-15 broad leaflets instead of 9-17 narrow ones.
Arisaema thunbergii ssp. urashima by Robert Pavlis
Arisaema thunbergii ssp. urashima by Robert Pavlis
Life Cycle: perennial
Height: 45cm (18in)
Bloom Time: late spring
Natural Range: Japan
Habitat: woodlands
Synonyms: Arisaema urashima, Arisaema thnbergii, Flagellarisaema urashima,
Cultivation:
Light: part shade to shade
Soil: humus-rich, well drained
Water: medium to wet
USDA Hardiness Zone: 5 - 9
Propagation: seed, division
Seedex availability (ORG&HPS annual Seed Exchange): rarely