I'm trying my first SFG this spring, and started by prepping two 4x4 beds. There is a slight slope to the south, about 4 or 5 degrees i'd say, and my soil is a clayish-loam mixed with compost. Do you think I need barriers to prevent soil erosion? If so, would I be alright putting a single barrier on the south side of the slope?

Also, while i'm asking...mine as well get another question out of the way.

I'm in a communal garden area, and lots of other gardeners seem to be laying straw on their plots after prepping them (presumably before even seeding?)...is this simply to keep their composted beds moist or warm? Or am I wrong and the only reason to do this is after seeding to prevent frost damage?

thanks, Mike