Lemon thyme is a small, shrub-like herb with tiny leaves growing in clusters along multi-branched stems. Mature stems become woody at the base and the tops are tender and light green.
Lemon thyme and common thyme (Thymus vulgaris) look almost exactly alike. Even an experienced cook can have a hard time telling the difference using appearance alone. Where the two differ is in the area of scent. Lemon thyme combines the earthy, woody notes of garden thyme with a lemony fragrance.