I got to Houston just in time for the Garden Conservancy's Open Garden Days.  My daughter Kate (R),  Melissa the Houston Garden Girl (center) and I set off to see many beautiful gardens surrounding beautiful houses in some of the historic neighborhoods in the city. I can't show you all 500 photos I took, but I want to give you just a taste of what we saw.  More will show up over time. It is azalea season in…