mexican fan palm

Great photo, i have just joined and would like to ask, how many stalkes should the fan palm have, i have just bought two and there are 4 stalks comming out of the pot on both of them,
its about the same size as the one in the photo.

should i grow them on a bit before planting them out ?

any advise would be welcome !!

thank you

Lenny

I have one its called Washingtonia Robusta it has four stalks I ve known people bring them inside in sever cold here is a couple of links for you

http://en.wikipedia.org/wiki/Washingtonia_robusta

http://www.floridata.com/ref/w/wash_rob.cfm