Not sure what is going on. Last week I planted a small cucumber plant that I bought at a garden store in a large container. I used fresh potting soil, sprinkled some osmocote in the dirt, have been making sure it's been watered regularly, but today I noticed that the lower leaves are starting to turn brown and are drying up. Do I have some type of wilt disease or are the roots still trying to take hold? I also planted a tomato and green pepper in their own planters and they appear to be doing fine.