Over the past several seasons, my once flourishing raised bed vegetable garden has become less and less productive. I thought it might be the soil, so I brought in new soil, but that didn't help. So I think it's a large tree that is both partially shading the area and invading the beds with fine roots. As a last resort, I thought I'd try grow bags this season. But the dizzying array of brands has my head spinning.

Can anyone recommend a good brand of grow bags? I thought I'd try 15 gallon bags for my Sungold (and other) tomatoes. I might try growing some Dahlias in them as well. TIA.