my holly is full of berries too! just waiting for the redwings and fieldfares to come, the berries as do the woodys. I agree that we should grow more berry bushes rather than putting out fat balls but having said that I like to watch the antics of the birds on these .
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You need to have both sexes. Only the females will have berries, but they need a male for pollination. They will grow in a large pot.
Silver Queen is a male and will not have berries.
Golden King is female and will have berries.
This one is supposed to be self fertile Ilex aquifolium 'J.C.van Tol'
These are both Self fertile holly trees
http://search.thompson-morgan.com/search?w=holly+tree
i have a few old cds hanging in the branches . and plenty of feed out fot the birds