I would like to take a guess on what the white things are on dutchys soil, that is if you dont mind dutchy.

I do believe its Vermiculite. Correct me if Im wrong.

Dutchy, they're looking great, and by the end of the summer I think you'll have achieved more 3-4 meter plants haha, I believe even more since you havent even fed them yet.

Goodluck mate, will stick around to see this go down.