[fortyonenorth]

I had the same problem on a new bed last year. A soil test after the season showed extremely low phosphorus. Any chance that's your situation? Phosphorus is very immobile in the soil - meaning it doesn't leach through and come in contact with the roots. The roots have to "find" the phosphorus. If you have compaction or other issues which limit root movement they simply can't get to the phosphorus. This results in stunted growth.