Why will nothing grow in this one section of my garden?
I'm having a strange problem with my raised bed garden this year--strange only because of the last two years, which were incredibly productive. For starters, my garden is about 12 ft. by 4 ft. I use mushroom manure in the spring before planting and have so far planted everything from seed. Obviously I don't treat any of the vegetables I grow, I weed when it seems necessary, and unless it gets overly dry I let nature take care of the watering.
The past two years I had no issues. Whatever I put in the ground shot right up. My neighbor, who fertilizes like mad, was blown away. And this year, again, I had tons of the usual vegetables: lettuce, kale, cucumbers, beets, chard, beans, collards. The only thing that didn't grown was a short row of onions, whose seeds were leftover from the year before. I chalked this up to the fact that maybe the seeds didn't keep well over the winter. But then a few weeks ago I planted lettuce seeds in this bare spot--lettuce seeds that I had just bought and used successfully in a different section of the garden--and nothing. Not a single sprout.
This area gets sunlight almost all day (there are no tall plants blocking it, either) and has been thoroughly dowsed with off and on rains from last week. There are no weeds growing in this spot, apart from a small clover which I plucked this past weekend. I'm at a loss as to why this one section won't produce anything. Any advice or suggestions would be greatly appreciated. Also, the nearby plants are cucumbers, beans, chard, and kale, all of which I've read to be good companion plants to lettuce.