Replace cracked or worn extension cords with new. #16 gauge cords that have the listing, of a nationally-recognized testing laboratory, safety closures, and other safety features. With cords lacking safety closures, cover any unused outlets with electrical tape or with plastic caps to prevent the chance of a child making contact with the live circuit.
Perennial mints, including spearmint, applemint, and peppermint, are very vigorous and can become invasive. Rather than planting them directly in the garden, grow the plants in containers, then sink the containers into the garden. This will contain the roots and limit spreading.