Use google or your favorite search engine and use the key words:
cannabis revegetation
The results will include several articles from either seed companies or people that have web pages devoted to growing Cannabis. One of the links should be from a blog page on the websites for Royal Queen Seeds, one of the
sponsors here. The link to that blog will be below. You should also see articles from Leafly and GrowWeedEasy but those are not
sponsors. Worth looking at several websites since the photos that are used to show what happens to the leaves and plant are different at each web site. Plus they have links to related articles.
Then come back and do a search here though people here tend to spell the name of the process many different ways.
https://www.royalqueenseeds.com/us/blog-the-pros-and-cons-of-regeneration-n360
I have mother plant going through a major pre-flower stage and it looks like it is trying to form buds while under 18 hours of light. I had taken a cutting from it earlier. The cutting rooted and now the new plant is going through a revegetation cycle. The first photo below is from this morning and the rest are cropped closeups taken from that photo. Looking at it and it is easy to see that it has started revegetating. Plus it is easy to see the stages of revegetation working from the bottom with the oldest growth to the stop with the recent growth.
The second one below is from lower on the plant and is showing some of the early stage "funky changes" that started to take place several weeks ago.
This third one which is below is a bit higher up on the plant and shows that the single blade leaves had started to grow. The edges are not as serrated or sawtoothed as the usual Cannabis leaf. Often the edges might even be completely smooth.
The fourth photo which is below shows that up to this point the plant was still growing trichomes and pistils like usual even though the leaves were growing just one smoother edged fingers. Notice the trichomes on the early pre-flower parts and that there are still the white stigma or pistils. Even a few trichomes are still forming on the main rib under the blade leaf.
And in this last one which is below shows the top several inches and that the plant is no longer growing any pre-flowers or trichomes. It is still growing single bladed leaves but the serrations on the edge are getting more pronounced and are coming to points instead of being rounded.
Other things I have noticed on this clone and previous times I have done this regeneration include that the spacing between nodes will change. I believe that the 3 finger leaves will start to show after another couple of nodes. Eventually everything will be back to normal and I will have a new mother with pre-flowers and all.
This is a Blue Dream clone and it is a clone taken from a clone from a clone and this one is about generation 9 but I would have to look at the records. Seed was planted in November 2017. In the photos it does look like it is getting too much Nitrogen but it is naturally a dark green leaf so the leaf color has to be genetic. Plus the photo is