My oregano tastes "sour"?

I have had an oregano plant and it has taken off nicely, however, i have found the leaves are rather sour or really tart. I really cannot tell because its definitely not how it should taste. When i first got the plants it was oregano, i checked, and it tasted like it. I've taken care of it and pruned it and its not flowering. -_- help? any ways to fix this or should i just pull it and get new?