[aroid-l] Xanthosoma robustum

Hello everyone, 
 
I have an interesting problem with Xanthosoma robustum and was wondering if someone out there could help me identify the culprit.  I have several X. robustum "pups" that I traded with someone last year and they are now quite large.  However, the plants all have only two leaves each (very large leaves).  As soon as a third leaf begins to grow, the oldest leaf stalk bends over and is unable to support itself.  I've never had this sort of problem before and can't figure out what to do (the mother plant is a huge beauty with many,many leaves!).  I've tried everything from increasing the light, lowering the light, increasing the moisture, letting them dry out more, etc...but nothing seems to work.  Does anyone know what the problem is?  Any advice would be greatly appreciated. 
Thank you. 
 
Leslie
 
 


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