An important metric for growing any type of plant is vapor pressure deficit. This is used to optimize the nutrient uptake for the plant. Optimum values vary depending on the plant and its growth cycle.
You can find charts as well as detailed explanations on the subject online. As for home assistant you’ll need a temperature and humidity sensor. Then with the help of a template sensor, create a VPD sensor for your grow. You’ll find examples and further discussion in this post.