Culture Overview*
Amorphophallus titanum
(Becc.) Becc. ex Arcang.
Botanischer Garten Bonn
Meckenheimer Allee 171 
53115 Bonn
Author: Michael Neumann 
Tel.: +49 228 / 73 55 23
Fax  +49 228 / 73 90 58
latitude 51,27N   longitude 7,15O 
altitude: 60 m ü. NN
mean Temp. (year): 15,7 °C
mean Precipitation(year): 600mm
  June, 1998

Compost:80% peat continuously fertilized / 10% sand washed, 10% fine pumice, with a thick drainage layer at the bottom.
Watering:During vegetation period keep evenly moist, not too wet, because of danger of rotting; when the leaf starts withering, stop watering!
Fertilization:March - October weekly 1 x 0.3% Wuxal super 8/8/6" (or something equivalent) until water runs out of the flowerpot. November - February the same concentration (0.3% 8/8/6) every three weeks; stop fertilization when the leaf is withering. 
Temperature:maximum: 34°C optimum: 26°C minimum: 24°C ; 
Air humidity:80-85% relative humidity 
Location in a greenhouse:Keep in a very warm and humid greenhouse. 
Light conditions:at very light sun exposed places, in summer (April until September) it is necessary to shade, in winter as much light as possible. 
Dormancy:Vegetation period between 12 and 20 months. When the leave is starting to wither, the dormancy period begins (2-4 months). This period ends when a new bud is visable.

Reproduction: Seed handling:When the fruit is ripe, seeds must be cleaned from the pulp, easiest if the pulp is fresh. 
Sowing:Immediately after the fruit is ripe. 
Planting depth Approx. 5 mm, only one seed in a 9 cm pot with compost as mentioned above, bedded in sand; seed position not of interest; 
Germination conditions: Light conditions:see above 
Temperature:26°C; bottom heat also 26°C Watering:evenly moist, not too wet
Dormancy: Because of small pots, occasional watering is required, do not store completely dry! 
Diseases and Parasites: Disease: Attack of Fungi, which let to rotting of the tuber (only during dormancy)
Parasites:Nematodes and mealybugs of roots Prevention: Nematodes infection: practically not to prevent, therefore ± sterile operating is necessary;  Mealybugs: biologically with Hypoaspis (predatory mites) in and on the compost; chemically only with chemicals not containing phosphoric acid esters, but caution, plants often incompatible to chemical treatments; rotting: treat only large rottened areas, clean these areas up to the healthy tissue, cover with charcoal powder

Replant during dormancy, after every vegetation period. The new pot should be three times larger than the diameter of the tuber.
The most important fact for a successful cultivation is to prevent nematode infection by ± sterile handling!


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