You should be able to find all three . I suppose hardest might be a shrub that never exceeds 1/2 inch diameter except in the most favourable locations , sort of the absolute minimum for a slimline .
Hmm... any suggestions? I enjoy gardening (and the challenge of growing unexpected things) so thought I might try planting some stuff with the potential to harvest it for wood in the distant future.
I finally got a piece of oysterwood big enough to make a pen out of. Doesn't really get much bigger then a bush but nice. I have a lot of wild grapevine it gets 6" or bigger, I have some dried in my shop let me know if you want some.
I recently cut an old asumed to be hawthorne cane into 5.5 inch segments and made an unusual Hart style pin. It was stained and varnished about 150 years ago and most of the stain turned away leaving variated colors of beige to brown not to mention the pin knots.
So you might want to research hawthorne. To my surprise this wood did not have a soft pith.