I've checked the bulb a couple of months ago and even today, as it hadn't sprouted last spring , the bulb looks very fine, firm, no rot and healthy looking with dormant fat growing buds, I've never had this plant doing this before.
I have it in a pot and keep it damp but not too much as it has no foliage nor roots.
Anyone has had the same experience?

Hi Myriam,

I don't know a thing about Arisaema but don't give up on your bulb just yet. I found this old thread that is interesting reading: The thread "Don't give up on that Arisaema" in Philodendrons, Elephant Ears, and Other Aroids forum

Thanks Lin for that link, now I know I'm not the only one with an Arisaema issue!