The phrase “Mother Culture” is not found in any of Charlotte Mason’s writings but was a term written in the Parents Review in 1892. Here is a quote from that article:

There is no sadder sight in life than a mother, who has so used herself up in her children's childhood, that she has nothing to give them in their youth. When babyhood is over and school begins, how often children take to proving that their mother is wrong. Do you as often see a child proving to its father that he is wrong? I think not. For the father is growing far more often than the mother. He is gaining experience year by year, but she is standing still. Then, when her children come to that most difficult time between childhood and full development she is nonplussed; and, though she may do much for her children, she cannot do all she might, if she, as they, were growing!

Is there not some need for "mother culture"?

Learning to Live: Embracing the Abundant Life of a Mason Educator (48 min)

How can you continue to grow as a person? Pick up a book, take a walk outside, learn a new handicraft. The opportunities are endless, but our time is not. Therefore we need to be intentional and make the space for it. In this video, Amber O’Neal Johnston challenges us to make the time and effort to prioritize mother culture.