I worked in horticulture for 10 years before going back to a corporate job and then taking early retirement.
My route was slightly different, I am ex construction and then did corporate construction training and then decided, once a contract had ended, that I wanted to teach horticulture in some way. I had done a basic gardening qualification at the local college and applied for jobs teaching. I got the second one I applied for. My knowledge comes however from doing veg growing, organically, at home and on my allotment. The qualification was just to tick a box.
The job I got was working with mainly teenage boys at various SEN schools, to use horticulture as therapy. I got the job as I'd had the vast experience of working with men in my construction role as they needed someone who wasn't too petrified of teenage boys, as well as knowing how to grow food. This also extended to teaching people with disabilities, and learning difficulties, some quite profoundly disabled as well as dementia groups.
I did that for a few years, then went into running my own teaching business, on a community garden which had to be brought back from a wilderness to a suitable place to teach. I also did a further RHS L2 in practical horticulture. And my PTLLS and DTLLS and also got a foundation diploma in teaching those with learning disabilities and difficulties. At the time I also worked 2-3 days in a SEN college doing 'life skills' using horticulture as a framework.
I worked with my good friend, it was our names on the documents at the end of the day so it was stressful knowing each day we were taking a risk having them on site. We worked with older mostly male teens and into early 20s. Many had violent histories, many had got themselves into a pickle and never got out. And some couldn't even add up basic numbers or tell the time. So i ended up having multitudes of gardening activities that also taught them basic skills. We did everything from teach them bookbinding, so that they could create their own dictionary of the useful words they learnt, to butter making to eat with the bread they made in the earth oven they also made, which also cooked the pizza they made with the tomatoes and herbs they picked that morning.
If I hadn't left the UK after taking early retirement, I'd basically be doing local gardening and potentially teaching low key organic veg growing in community groups. I developed a large range of activities that can help people access gardening from the sterile environments of a children's cancer ward, to creating worm farms from scratch. I also at that time, developed activities to teach the whole of the science curriculum, across all schools years, solely in the garden. It can be done!
Over here in France, I can't work for another 3 years (on an inactive visa) but I've already had requests to run groups and courses, but to be honest, I prefer to do what I do now which is grow in my own garden, and also grow hundreds of plants for swaps and to give away to people I meet to spread the knowledge and joy of heritage veg, and to save as many seeds as I can for the same purpose. Over here, most people have veg plots so there is a huge potential for people wanting plants and seeds. I do it for fun, which is much less stressful.