Amorphophallus decus-silvae is reported as previously found across the south west corner of Java from Palau Kembangan and
west as far as Mt Halimun. Maps show this area as mountainous and covered by jungle but almost all of the west has been
cleared. Plants have been found on Mt Halimun and possibly are still at Nusa Kembangan, and it is expected that the range of A.
decus-silvae is very restricted.
Amorphophallus decus-silvae is a lowland plant, found in jungle within 100m of the ocean and to a height of 300m asl. A.
variabilis can be found within the same area.
Although A. deca-silvae grows in a seasonal region that experiences dry weather between May and December, it is not dormant
during this time and plants may be found in various stages of their growth cycle.
Plants are found in areas where it is warm throughout the year and where daytime temperatures range from 30C-36C in January
to 20C-24C in June. Plants are found in the forest in the shade of taller trees, not in full sun. They grow in clay based soil, often
rocky and covered in leaf litter. Tubers are deeply buried, up to 30cm. Seeds are usually red and the size of a coffee bean. The
petiole of A. decus-silvae is smooth, brown-green and may grow to a height of 3metres or more.
The plant is extremely rare.
Seeds have grown well at our garden and produced some good plants with large tubers forming.
A decus-silvae tuber
A decus-silvae petiole
A decus-silvae plant
A decus-silvae influorescence
growing at Bali Orchid Garden
Amorphophallus variabilis may be found in the same area as A decus-silvae in Java, Indonesia. It has
grown readily in our garden in Bali and plants are now on view and can be seen flowering.
A variabilis petiole
A variabilis seedling
Found in various regions in Indonesia, the plants have grown very easily
in our garden in Bali. Tubers are readily produced and young plants have
flowered first season from seed.
A hirsuitus seedling
A hirsuitus inflorescence
A.beccarii is found in various regions in Indonesia.
Seedlings have grown well in our gardens in Bali
and plants can be viewed there.
A beccarii petiole
A beccarii plant
Said to be endemic to the Harau Canyon in West Sumatra and have also been found growing along river banks in other areas near Payakumbuh in West Sumatra.
A. manta is found at around 500m asl in swampy land surrounded by slopes covered by thick jungle which provide a shady canopy. The ground in which A. manta
grows consists of peat over clay, covered by leaf litter. Tubers are very shallow with their roots spreading out within the peat amongst the roots of the surrounding
There is very little seasonal variation in the natural habitat. Daytime temperatures 25-30C, nighttime temperatures 8-10C. There is permanent rainfall in the area
of growth and no set dry season.
Amorphophallus manta is a Type ll Amorphophallus with plants being seen at various stages of growth, some in seed, many in leaf. The plant is small as are the
tubers which do not survive well out of soil.
The petiole varies considerably within the species from almost black to completely green. The leaf is a greenish-blue with an iridescent blue or red hue.
The height of a mature plant is about 60cm to 1 metre.
The plant in culture prefers a peaty damp soil in the shade and likes to have year round watering. It has grown well at our gardens producing flowering size plants.
Amorphophallus gigas has been found throughout the island of Sumatra in Indonesia.
Amorphophallus gigas is often found growing in similar areas to A. titanum, but A. gigas tolerates drier conditions allowing it to have a wider range of territory. A.
gigas is often found on the flatter ground where A. titanum is found on sloping ground. At higher altitudes of around 1200m, where the plants grow in dark, damp
and humid conditions of the jungle, A. gigas plants are smaller than in the lower altitudes where conditions are drier and light intensity higher. A. gigas grows in
areas of high annual rainfall where there is little seasonal difference thus is a not seasonal plant and the tuber should not be dried out.
It appears more tolerant of its growing substrate being found buried deeply in various soil conditions from clay to stony ground.
A. gigas has an attractive petiole with a multitude of greens and white on a green background. The plant may grow to 3 to 4 metres tall, with tubers having been
found weighing up to 47kg.
Plants grown from seed are seen at the gardens, flowering in season.
A gigas seedling
A gigas petiole
A gigas inflorescence opening