I am growing a little chocolate mint plant by the window and the stems are pretty long now. How do I safely remove the mint so that the plant keeps growing? Do I just pull off the leaves and leave the stem in the soil? Or do I take out the whole stem? If so, where do I remove the stem from? Just the top soil or pull the whole thing out? I'm worried it won't grow back if I take the stem out. Any gardeners know? Thanks!