Gabriela, I am so sorry for your and my disappointment that it turned out not to be a spike. On the other hand, I am relieved that it was not because I would have been GREENNNNN with envy. I have had one for more than 2 years, it has decided that it will take over an entire wire fence where it is growing, but not a sighting of a spike. I read somewhere that you had to bend and pinch the vine, and that would induce flowering. Tried that, seems it only made the plant more determined to keep on growing.
Ill post a pic. later.
Good luck, I do really hope you get a spike. The race is on!!!