I started this guerrilla gardening project around 15 years ago. It was by no means my first guerrilla project but it was by far the most visible. I had been looking at this location for a couple of years before I started. It was mostly bare dirt so there was little prep work.
This photo is after the first planting. I would plant between 20 and 40 plants each trip. I worked about an hour at a time on my way to work. I might do a couple plantings a week and then not work the site for a month or two.
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After a while the plants fill in their locations and start to multiply. I have taken hundreds of cuttings from this garden to use in other gardens.