I cut these leaves off just in case it was something that could spread. I'm new to gardening, so pretty clueless. The plant is just under 2 months old. It seems to be doing fine otherwise, the other leaves are firm and vibrant, but some of them look like this and worse, drying and dying. I've inspected them carefully; I do not see anything that look like insects or bugs on the leaves, nor any kind of mold/fungus that could be scraped off. Your help would be so appreciated. I've started growing a few different kinds, but I really want to use these!