If it's flexible and somewhat long, you can probably weave with it.  Might as well just try some stuff out.  I made a couple ribbed baskets (search for images if unsure what they look like) with some sycamore maple shoots as the ribs, and dried yucca leaves for the weavers.  Both I just collected from my small suburban garden--the yucca leaves just shed off the plant and I collected the least dusty ones from the ground underneath (and split them into narrower lengths to make weaving easier).  I use them both as harvest baskets, and it doesn't matter how long they hold up because I can make another just as quickly and easily.
 
 I have also woven with willow but it's more of a plan-ahead project.  I'm sure you, like me, have a lot of flexible plant material that could be woven with right now.  Vines, suckers from trees/shrubs, daffodil leaves, rushes or sedges, lots of things.  Try bending the material and if it doesn't snap, cut a handful and make a little basket with it.  Take 20 minutes over it.  It's fun!
 
 
 Not the best basketry photo, but here's one of my yucca baskets in use last spring.
 Edited:  found the better photo!
 
