We specialize in high-traffic, urban environments with the challenges that are unique to the east side of our city: a very large canine population, massive crowds of tourists, high population density, and our uniquely mild but difficult climactic conditions that features high afternoon winds, foggy mornings, and extreme conditions that can range from drought to floods.  Combine these elements with the fact that almost all landscapes in and around the large buildings in San Francisco are actually growing in containers and not in the ground, and you've defined a very difficult growing environment for most plants.