When you don't have room to build out, you build up. The same rule applies to gardening. It's horticulture day and Host Charity Nebbe talks with Iowa State University Extension Horticulturist Linda Naeve about adding a new dimension to our garden or landscape with vertical gardening, including trellises, stakes, cages, archways and green walls. Extension Horticulturist Richard Jauron joins in to answer listener questions.