Hello everyone! I am new to this forum as well as a newbie gardener. I built a garden box 20' x 6' recently and filled the bottom layer with some fill dirt I picked up from Craigslist which was very dense with a lot of clay material. The top I filled with some soil I picked up from Home Depot.
I had spread some lettuce seeds awhile back and everything was fine. Lettuce was growing great and was able harvest some of them until they started withering away 1 by 1. I decided to remove the lettuce and plant new seeds and when I pulled them out there were greyish white mold growing on the roots. Every root I pulled up had the mold on there. Is this what is causing my lettuce to die and if so how do I fix the problem? Any help would be great... I tried googling it, but couldn't find the right answer. Maybe a drainage problem? Please help... I just planted new seeds, but I'm thinking it'll happen to them too. I light water daily and the weather here is at about 60 degrees with minimal sunlight. Thanks in advance!