I see a lot of ads for the Preen Weed Preventer, which is supposed to stops weed seeds from germinating, so I thought I would try it to keep the weeds down in my tomatoes since they are a little hard to hoe once I put cages around the plants. According to the label it is supposed to stop seeds from germinating for 60 days. It did work as advertised, but the next year I planted green beans in the same area, and where I had used the Preen they did not come up. Where the row went beyond the former tomato area all was normal, but in the area where the tomatoes with the Preen had been I got less than a 10% germination rate. Last summer i finally had good germination results in that area, so if you are thinking about using it, I suggest considering what will be there next year as well.
If you are not part of the solution,
you are part of the problem!!!