1. Windblock. Bucolic Bushwick is using reed fencing but I haven't really spent time figuring out how to use something that tall for my space without it either blowing away or blocking sun for a portion of the day. In the meantime I have a janky setup based on a design used by one of the Green Roof Growers. If I recall the sides are 2 x 8s, the bases 2 x 4s and the corners 1 x 2s. Yes, that's plastic wrap...does a good job of protecting seedlings and allowing light to fall on them. When things get crowded, it comes off...usually the plant is established enough to endure summer winds by then with a little extra protection. Last year I ended up putting landscape fabric up after the EBs came out of the trenches; this year I will go with reed fencing only if I can find a short height. I have no comment on ecological soundness of plastic wrap and lumber from a big box store at this time.
2. Earth Staples. Last year I wrapped twine around the EBs to prevent the mulch cover from whipping apart seedlings. This year I bought some of these and they work out perfectly when pushed through the cover.