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In my experience, this is normal. Some species and varieties are more likely, times a year out to make than others. If all goes well, this occurs with me usually but only when daughter tubers or bigger tuberous after flowering. When things are not so good... it may cause problems with shoots (unfavourable condition, or for example a damage of tip) in tubers of any size.

Hi Christian,.

still not much to natolii I can say; I have two clones, but not so long that I had observed such a thing.

gallaensis I in the second season and you apparently like to cast out in the winter (Dec/Jan); whether they also expose an entire year, I don't know.

When someone, who once vonn me a rel great operculatus (about 3-4 cm diameter, ca 15 cm long) has gotten, it took 14 months, until it is again driven out...

It is but more extreme; in July 2011, I've got once 3 cicatricifer tubers that several years in a row had shown by swelling of the buds that they wanted, but exorcise after transplanting are they stuck then again and again and not driven out, which I then have stored dry again. The first has made a sheet in the last year in February, almost 7 years after I got it.

Happy growing, Bernhard.

7 years without Wachstumsanzeichen...ich entsorgt...doch tubers would have probably been 100 times I vow in the future improvement

Hi Ralf,.

Growth signs were there already several times - the bud was clearly to swell, but after potting nothing has done themselves then so that I again have let them.
So long a tuber is not soft and is not completely dehydrated, there is always hope...

Happy growing, Bernhard.

A Sauromatum venosum had skipped a vegetation period of 2015 also.

Hello
do you think this could be a survival strategy?

With some Butterfly pupae, there is a similar phenomenon, for example, when the small Emperor moth (Saturnia pavonia). As it often happens that dolls not hatch out in the spring, but still a year or longer "lying over" and then slip out. This happens quite often, occurred in me even when I have bred the kind. It is speculated that a population can withstand so unfavourable years. Could something similar when Arum plants play a role?

I would not rule that out.

Hello
Sauromatum I see that from time to time.
I think the summer is always very wet and cold.
As a strategy for survival, it would already fit.

Amorphophallus tubers and do it well, but the cause is probably different.
Unfortunately, I had not book and don't know so if there are always same tubers.

Many greetings
Olvi