I found some huge ornamental yews recently. Does ornamental yew make a decent bow? If so I am in good shape.
If you can find a bit without too many knots it may be ok.
You might find it's a bit rubber compared with the best stuff, but if it is then try heat tempering the belly.
Even poor Yew is still a pretty good bow wood.
Del
(Other opinions may vary... terms and condition apply... bowyers must be 8 years or over)