These plants are 1st year plants. These are seed grown. Plants have tubers 1" – 1¼” in 4" round plastic pots. Plants are 6" - 10" tall. I expect they will begin pushing their second growth in the next few months. With proper culture I expect these will flower in 4 - 7 years. These are a different strain than previously offered though I erroniously labeled them #3 again. These seeds were obtained from a vendor outside the US.
Photographs 1 - 5 are not of this strain, but are of 'Romero' that was a part of the Phipps Conservatory and Botanical Garden collection. Plant / Flowers will be similar.
This species is native to lowland areas of western Sumatra. This species as with most Amorphophallus and Arisaema species are seasonally dormant. Plants sprout from a subterranean tuber in the same fashion as the spring Crocus. Mature plants of this species grow 8’ – 12’ tall. Each tuber produces a single stem that terminates with a single “leaf”. Each leaf consists of an inverted umbrella of smaller leaflets that is 6’ – 10’ across. The leaf stem is green sparsely covered with irregular grey-white markings. These markings resemble lichens. The plant alone is very ornamental. The inflorescence is produced from the naked corm before the leaves are produced. The inflorescence is 5’ – 10’ tall. The inflorescence is single "flowered”. The “flower” is actually a modified inflorescence that consists of the spathe (outer ornamental part) and the spadix (internal sexual bits). The spadix is 4’- 9’ tall and enclosed within the spathe. The spadix appendage (non-sexual part) is purple-gray to dark purple-black, extremely elongated, and tapers to a point. The spathe that surrounds the spadix is 3’ – 6’ long. When fully open the spathe flares open rather than staying upright. The exterior of the spathe is green to dark green. The interior of the spathe is dark red-purple. Flowers last a few days to a week. The Infructescence that can form is also very decorative. It consists of a corn cob like structure of green berries that turn yellow, then orange, then red when ripe. The infructescence is 4’ – 6’ tall. It is important to wear gloves if you harvest the berries as they juice can stain and irritate mammalian skin.
It is usual for this plant to NOT produce a growth the same season after it flowers. It skips that season and grows the next year. Tubers often flower every other to every third year.