Could be amount of light exposure - they are bending to reach more light. Could also be that the stems were lanky/leggy/too weak to begin with so they bend back and forth in an effort to support the top growth until the stems can strengthen up some.

Could also be excess N stimulating too-rapid top growth for the plant to adjust to.

Dave

They are in full sun except where there might be shading from other veg plants. I change beds every year and every year it is the same. I will do some soil tests. Just read they have opinions about pH. The stems are very hefty -- the base gets so big around I have to use a saw to cut it.

Also read they want a lot of feeding during the season. I must admit that except for compost at planting and the odd drizzle of fish/kelp solution, I'm not good at fertilizing.

Just took a walk through the community gardens and past the farm. BS plants left standing through a hellacious winter are STILL standing up straight and tall. My one remaining plant (left for late fall harvest and then ... whammo, way too much snow too soon) is laid flat out.