I agree with sailordad , , pick it somewhat large,,3/8 to 1/2. You will see the difference in spine as they dry out.Wood is wood. That being said, Hard woods work better than soft.We have alota dogwood in our area, but no river cane. I have gone to Homedepot and bought bundles of tomato stakes ( bamboo) for about 4.00 and choice the narrow ones and made some great arrows. They come in 6 foot length, so one cane will give two arrows . And they are very straight and slender.AS for choice of suckers at the base of the trees, Red oak and hickory and ash are my choice. We have sugar maple , which is hard rock maple. This Makes a good arrow. Got lotsa wild roses along the yard. But with all this arrow material, I haven't seen many Indians. lol Denny