The vast majority of rain gutter gardens (and other sub-irrigated gardens for that matter) are not in the city where they are most needed. They are in the suburbs and the country. This sub-irrigated rain gutter garden is on a deck attached to a house with a large yard. It looks to be in the country. In any case, the garden is of above average health and does not require a green thumb. Anyone can do it.
This garden could be on a balcony, rooftop or in a row house yard in any city in America. Why aren't sub-irrigated gardens of all types more widely seen in the city? If you have read this blog for a while, you probably know that I believe the cause is our shamefully retarded urban horticulture education. What is your opinion?