Like Dr. Michael Dirr, Dr. Armitage is widely respected among professional horticulturists, landscape architects, and serious amateurs. Both may be tired of the constant comparisons, but thats the reality. If you own the Michael Dirr app ($14.99 and worth twice that), do not expect this app to be similar in any way. While the Dirr app is essentially his complete tome on woody ornamentals (with lots of color pictures!) in a handy little searchable database app, this app is like a Ladies Home Journal spring gardening issue. Its great for sparking some ideas with good photography. Period. It contains a very small personal selection of the authors favorites that seems obsessed with deer resistance. Only barebones information is included on the limited species. For those that buy their plants only at Lowes/Home Depot on weekends in May, this would be a great app if it sold for $.99. Professionals and serious amateurs will be sorely disappointed by this app for $4.99 with Dr. Armitages name on it.