I notice that when i repot my alocasias, i find lots of bulbils growing on short underground stolens. My observation is that these rarely ever grow until severed from the mother plant, The last time i repotted my A. poly you could clearly see there was 3 sets of bulbils that where not growing, and one round of smaller bright ones that were yet to fully develop. it had been 3 years of growth with out repoting, the oldest bulbils were closest to the mother and very dark, almost black, several had detached from the mother, via rot, and were lighter and larger and growing. 2nd set of bulbils was farther away and pretty dark the 3 set was 6 inches from the mother bulbs and quite light. All were just as viable as the next, the newest ones were not developed and died mostly.
It seems like an odd strategy to me, I often wonder why do they do that, 3 yrs is a long time for a dime sized bulb to just sit there why not just go ahead and grow? I also wonder do all alocasias do that, and do any other aroids do that besides alocasias?
Just bored and thinking off all the bulbils i just found in my frydek, it was unbelievable.