Water-soaked black and brown spots on plant leaves and stems often indicate a fungal or bacterial disease is the problem. Adjust the watering schedule and do not allow plants to sit in excess water.

Cannabis is evolving—don’t get left behind! Curious about what’s next for the industry and how to stay ahead in today’s competitive market?

QUESTION: We have a tropical corn plant, with three main stalks. We have had the plant for about six years, and it has doubled in height since we received it.

Q: The leaves on my rhododendrons on the north side of my home in Northwest Arkansas are turning yellow and have brown spots [the reader sent a photo].Do you have any suggestions to remedy this? I ...