Novinity

I've made some custom flowers in my mod, but I'm struggling to find anything on making them spawn throughout the world that is supported in 1.20. How would I go about doing this?

Well frick. Got any suggestions of where i could ask for some?

I am looking to begin mod development for 1.12.2 and 1.7.10 and require some tutorials that are NOT from the stone age. Please and thank you :)