Maude tells this to Harold. He said he wanted to be a daisy because they were all alike, but she said they really weren't, and explained many of the differences. A person could think they were part of the crowd, but they really would not be. There would be differences between them and everyone else, no matter how hard they tried to be like everyone else. There is no point in trying to be like the crowd, because you never will be just like them.
Many people think that all daisies are alike.
Many people think that a person is part of a crowd. A person can be treated as part of the crowd, but he still isn't. He will be different, and there is no way that he can change that. No matter what other people think, a person won't be exactly like other people. I like to watch things grow.