Free Catmint (AKA catnip) plant

Pros:

• A good plant for attracting bees and insects to the garden
• Pleasant minty smell
• Perenial - survives year after year
• Its free!

Cons:

• Once the word gets out, your garden will become the place for the cool cats to hang out and get stoned :)

Yes, if you don't mind drooling cats rolling around in your flowerbed, this is the plant for you!

If you do go for it, maybe consider keeping it in a pot, or with some kind of barrier around it because excited cats like to roll around on the plant.