Show friends how much you care about them by giving a gift that keeps on growing. Flowering plants are an eco-friendly alternative to the traditional bouquet that will wilt in a week or so. Think about your pal's personality before you buy. Get a peace lily for a friend with a flair for the dramatic, or a christmas cactus for a buddy who wants a plant that can withstand forgetful waterings. Flowering air plants also make interesting gifts.