Remember when vertical gardens first became popular? They were beautiful, but they all seemed to necessitate access to a 20-story building, an impossibly sophisticated irrigation system, and approximately three million dollars in plants. There are vertical gardens and vertical garden tutorials to suit every space, style, skill level, green thumb, and plant budget these days. Outdoor plants are lovely, but there’s something to be said for bringing some greenery inside, and even more for growing those greens indoors or out in a space-saving vertical garden. If a traditional garden bed is not available, container garden ideas are ideal, but some require a lot of space. A vertical garden hangs on…