Lay them out in the sun on a screen or something. They will be green in color but dry in a week or so. If you leave them longer they will turn a brown in color. Be sure and soak them in water until plyable again before twisting, weaving or working the reeds. If you can wait until the end of August the reeds will be wider and longer which is a good thing. If you're like me you won't wait....
Glad to see someone is still being inspired by my homegrown equipment thread. Please post some pics when you're done! I still use the quiver I made from time to time and it is always on disply in my den. Sure was fun to do!