I like to grow catnip for my cats. I bought 3 seedlings at a local nursery and transplanted them into a clean 3 gallon plastic
container, containing Premier pro-mix potting and seeding soil, and put it outside in the sun..
After about 2 months it was completely overgrown and began to develop a problem. The bottom leaves began to turn a blotchy white
color. I thought it might be a fungus because it was so overgrown and no air could get to the bottom leaves. I thinned out the lower
half of the plants, but the problem continued, and has all but destroyed all of the leaves.
In the meantime I planted some seeds that I had harvested from the plant and put them in a smaller pot. When they began growing I
made sure that they stayed thinned out and had no leaves touching the soil. The same thing is happening to these plants, too.
Any idea what the problem might be?