All of the brassicas, except for radishes, start out under floating row cover. It’s the only way they’ll survive the flea beetles. Around here, the FBs are a clear and present menace to the cabbage family. They chew little holes in tender baby leaves until nothing but stems and dried out leaf skeletons remain. It’s awful. I could use organic sprays, like rotenone or pyrethrin, but although they’re “approved” and from natural sources (other plants), it seems to me a slippery slope, or at least habit-forming. I haven’t sprayed so far. I did try a garlic blender concoction as a repellent once, but it was like cooking for the FBs, they hopped off and hopped back on once the spraying stopped: salad dressing! Anyhow, this is bok choi (pak choi). FBs eventually managed to get under the edges and do a bit of damage, but that’ll be outgrown, bok choi grows fast (as do radishes). Once the leaves get a bit more substantial, the FBs can’t as easily chomp on ’em. Cauliflower and broccoli, under this same 14′ wide sheet of row cover, are untouched. FBs REALLY like bok choi!