This grower is sure of this plant identification.
Self-seeded, re-potted (since photo taken!).
Golden lemon balm, Variegated lemon balm, Bee balm, Lemon balm
Melissa officinalis (Golden lemon balm). This perennial has been used for generations as a medicinal herb, It will produce fragrant golden foliage.
They are very frost hardy, they prefer full sun or light shade, with slightly moist, well-drained soil. You can propagate from seed sown in the spring.
Fragrance, medicinal, ornamental (pot pourii), beds, borders, colour