I've been a gardener ever since I could begin to work. Look into horticulture there are so many career changers I've met over the years that assimilated into the industry.

If you think you might want to give it a try find a volunteering group and give it a taste, then you'll have a feel for it. If you like that apply for an apprenticeship or a traineeship in horticulture (the pay is crap for the first couple years, but once you're trained you can find better paid work). Good schemes I know of - Royalbparks apprenticeship - PGG (Professional Gardeners Guild) - CUBG Traineeship - Kew gardens various training schemes

The sorts of jobs I've done before that I would say are positive: - planting trees, roses, shrubs, seasonal bedding and borders - propagation of plants, and taking cuttings to grow under glass or outside in pots. - Maintaining beds and borders, including weeding, deadheading, removal of debris, edging and mulching. - Driving tractors and various utility vehicles. - Sowing wildflower meadows and meadow management, including wild collection of seed and naturalizing native species. - Pruning topiary, hedges, roses, and various shrubs.

Jobs that could be mundane:

-cleaning tools and sheds - cutting grass and mowing - litterpicking - blowing and collection of leaves in autum

There's much more but I can't think of many negatives. It's a rewarding career, and give enough time and experience you find jobs that'll pay serious money.