What does beginning of winter radish cabbage mean?

"beginning of winter radish and snow cabbage" means that white radish can be harvested when the solar term comes in beginning of winter, and cabbage can be harvested when the snow term comes.

Generally speaking, white radish can be planted around the Mid-Autumn Festival in the early August of the solar calendar. White radish is still very resistant to high temperature at seedling stage, because it happens to be dog days, so it has an alias. The growth period of white radish is about 90 days, and it can be harvested in early winter.