Vanilla cutting new growth, HELP

[Helen]

Hi everyone,

Well, my vanilla cutting I purchased last December has two nice very long roots, and now a new 'something' has sprouted, and I don't know what to do with it. I was assuming I would get a new leaf, but this looks like a new vine with a little root starting? HELP would be appreciated as to what it is exactly, and what should I do next. Soon I won't be able to keep the lid on my seedling box...thanks!
Helen