Hi Cate, my kids are 4, 6, and 7, so they're not exactly "underfoot" like babies or toddlers. Still, we homeschool, so they are always here. I love it, love being with them, but some days are overwhelming.
I think you should definitely consider writing! If you enjoy nonfiction writing (and I think you'd be great at it-- you're so helpful and kind!), there are many markets you could tackle. With your love of gardening and veggies, you could consider home & garden magazines or organic/natural living ones. Although you are far from a senior citizen, you might consider writing for baby boomer publications. It's a great, popular market right now! And, of course, there are soooo many health, women's, and diet magazines-- all could be great prospects. Local papers and magazines are also a good place to start.
Have I mentioned that I'm a freelance writer? I love writing, and I find that it's the perfect job for a stay-at-home mom. I've only been published a couple of times in print, though. I don't really enjoy the lengthy query process, so I've been focusing on online markets. The pay is not nearly as good, but the process is quicker and you receive your pay much faster. When I grow up

and learn patience, I plan to pursue magazines again. I've also been thinking about going into copywriting, or writing for businesses. Pay is good and you can do it on a freelance basis.
OK, enough about me. My point is just that there are so many possibilities that involve writing. Many do not require advanced degrees or coursework. There are so many good books out on the subject.
Whatever you decide-- good luck. It must be exciting, having a world of possibilities before you!