This grower is sure of this plant identification.
I have 2 red shiso plants and 2 green shiso plants available
Beefsteak plant, Perilla
Perilla frutescens (Beefsteak plant). The leaves are red-purple and extremely attractive, they will range in colours from white to reddish-pink on a single plant. It is a half-hardy annual, grown for its colourful foliage.
You will need to plant in moist, well-drained soil in sun or partial-shade. The young plants will tolerate light frosts and should be planted in late winter.