Not to add to my own post, but I didn’t know that purslane could be used as a moisture-retaining ground cover! (see this wiki entry: http://en.wikipedia.org/wiki/Portulaca_oleracea#Companion_plant). Does anyone know anything additional to this? How fascinating. I wonder if I should be letting the purslane keep growing in my tomato garden as a way to help the ground retain water? I just assumed it would be competing with the ‘maters ….