Do i need any other plants to deter other than a bellis for woodpecker?
You might also want to deter the grey squirrels. And be careful with the colour of Bellis you use to deter the woodpecker, since the orange one will attract the grey squirrels.
(Two of the same type of bonsai would have added attraction, too).
So helpful Tracy thanks for warning
will try a yellow one
Just remember, a yellow bellis will not deter the grey squirrels, will just not attract them - to deter the grey squirrels you will need a flowering carmena aviflora (best not to make it a red one as this will have a very mild atttraction for red squirrels!)