I wondered if I could make a bow from a Yew Bush, Illinois grown in this case. So I did. The properties of the wood seemed the same as mountain grown billets I have mail ordered in the past. One limb had about 5" of deflex (as it had grown) along with a snakey turn. I used a heat gun to take out the deflex, the snakey turn is still there. Turns out about 1-1/8" wide tapering to 1/2" wide nocks, flattened D-section, 65" nock to nock, #46@28".
I am satisfied with the way it shoots, pretty good cast for a #46 bow. I know the tiller is not great, but I left it a little stiff thru the snakey turns. So I would say you can use a Yew bush for a bow. Pics below.
What became the upper limb
The lower limb
braced
snakey turn belly side
snakey turn back
full draw