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My amorphophallus titanium corms do not get enough nutrition as they shrink rather than grow. Any feeling for amount of nutrients and which nutrients and micronutrients I should be using to get good corm growth? Largest corm is about 3 centimeters in diameter (was ~ 4 centimeters this time last year).
I can't give recommendations for A. titanum specifically, but for the Amorphophallus I do grow (including the specimen pictured in the article), I use a fertilizer regime as follows:
When the new leaf is just emerging, a fertilizer with micronutrients included and analysis similar to 12-6-8 is best.
In midsummer, switch to a 14-14-14 or similar with micronutrients.
In Fall, switch to a 14-26-6 or similar. The idea is to increase the amount of phosphorus and decrease the amount of nitrogen. The extra phosphorus is required for optimal corm growth.
In all cases, the fertilizer should be a quality timed-release formulation. One of the best is being marketed in Home Depot, at least where I am, under the name "Dynamite".
I can't vouch for how well this will work with Titanum, but when used on other amorphs, the corm grows so much that in some cases, the pots have been distorted or split as a result.
