Regarding variegation

Regarding variegation

Hello everyone, I got two variegated peppermint plants in April, and they've grown pretty well. However, up till now, only a small portion of one of the plants have acquired the variegation which was supposed to come with it, even though both pots are placed at the same place, and watered with the same frequency etc. Would anyone be able to share how I can induce the plant to produce more variegation? Thanks in advance for any help.
Sharing Garden Pix

Sharing Garden Pix

funnel cake

funnel cake

ikea, red & white

ikea, red & white

STUDENT HOUSE!

STUDENT HOUSE!

My terrace again

My terrace again

Hello!

Hello!