Twelve years is a long time to wait! Dogwoods need some sunshine in order to bloom but they are understory trees so too much sunshine can harm them. Since they develop flower buds during the summer months the flower buds are susceptible to winter injury, especially cold winds. You might try pruning your tree back a little to encourage new growth (and flower bud development) and you might try feeding with a 5-10-10 or similar low nitrogen fertilizer. Hope it blooms for you next spring!
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