My girlfriend is involved with the solar house team at our university, every 2 years or so they complete a new solar powered house that is entered into a national competition. Now that they have something like 4 houses, they are putting them all into a 'solar village' near school. My girlfriend is also assisting in the landscaping of the village. One idea that she is considering is having every plant in the village have some secondary use besides looking nice (fruit trees, aloe plants, butterfly attracting plants etc., perennial herb bushes, etc) I was thinking that many people on this forum might have some good insights into other plants that might be of use. The criteria for such plants would be their ability to be used in standard soil, be perennials so that the village wouldn't need to be replanted each year, and ease of care since the university employees will likely be watering them.
Any ideas for such plants would be greatly appreciated and helpful!