Todd rote:

Do Poblano chilies turn red (Ancho) on the vine,
or do you have to pick them first?

If you leave them on the vine to turn red, how long
does it typically take?

Pablanos turn from green to brown (ancho) with a maroon hue.
http://en.wikipedia.org/wiki/Poblano
http://culinaryarts.about.com/od/glossary/g/Ancho.htm