What the 2022 study found
Researchers at the University of Florida grew thale cress (Arabidopsis thaliana) in regolith from Apollo 11, 12 and 17. Plants in all lunar samples grew, but they were smaller and slower than plants in a volcanic ash simulant, and their genes showed stress responses similar to salt or heavy metal exposure.
The more weathered the soil had been at the lunar surface, the stronger the stress. The study was published in Communications Biology in May 2022.
This model is illustrative
The growth numbers here are not measurements from the study. They are a simple curve, growth = base + (1 minus base) x (1 minus e^(minus amendment / 15)), with base values chosen only to rank the soils in the same order the study observed. Real outcomes depend on the crop, the nutrient recipe, water handling and how the soil was processed.