The description of “Flower Field” says that empty input and output squares should be '.' (dot). The tests say they should be ' ' (space). This causes most of the tests to fail if the description is followed in the solution.
I would suggest changing the tests: working with whitespace in these kind of problems is a pain. I’m happy to file a PR if desired.
Changing this exercise across all tracks seems like a bit change without much value. Spaces work pretty well outside of the instructions. The instructions work around it fairly well.