Mint Cultivation Indoors

Question

Runners grow long, with very small leaves; how can I get the plant to grow larger leaves?

Answer 1

I've seen it behave like this in very shaded or overly wet areas of the garden. You may want to try fertilizing your plants with fish emulsion and provide more light. Here's some info:
https://www.gardeningknowhow.com/edible/herbs/mint/growing-mint-indoors.htm