If you think you’ve spotted some oregano sprouting in your garden, but you’re not certain, there are three ways to identify it. First of all, take a look at the leaves. Oregano leaves are oval, have a coarse texture, and are lightly covered with fine hairs. They are also a deep, bright-green color.
Next, look to see if it has any flowers. If it has small clusters of pink-purple flowers, it’s a good chance it’s marjoram. Finally, rub your fingers against the leaves and smell them. If you’re getting that unmistakable, aromatic smell, then it’s definitely oregano.
Finally, if you’re still not sure, you can taste the leaf of the plant. Oregano has a pungent, slightly spicy flavor with hints of grass and mint. However, care should be taken as some plants can be toxic so always use this as your very last resort.