First of all, the ditch may represent obstacles or contradictions at the emotional or psychological level. In dreams, wax gourd usually symbolizes peace and tranquility. Therefore, dreaming that there are four winter melons in the ditch may mean that even if you face some difficulties and challenges, you can face them with a calm mind.
Secondly, the number of ditches and wax gourd can also be explained by combining the meaning of numbers. In the traditional culture of China, the number four symbolizes stability, steadiness and introversion. Therefore, dreaming that there are four wax gourd in the ditch may indicate that you are in a relatively stable and calm state at present.
However, the interpretation of dreams is very subjective, which may be different due to people's background, feelings and experiences. So the above explanation is for reference only. The meaning of dreams needs to be comprehensively considered according to specific situations and personal feelings.