Hi everyone.
Here's a thread where I may be of some help. Some 15 years ago my doctor advised me to close a stressful business, take some time off, and plant a garden. Of course I was way overweight but I was also smoking and drinking heavily. Ugh. Bad memories. Glad those days are long gone. Back then I did everything 110% and managed to turn gardening into something stressful and competitive too. lol
Anyway, I finished my county's master gardening program and maintained the certification for 7 years. I haven't kept up with the volunteer work to rightfully call myself a master gardener now, but I grow tomatoes for market (over 1000 plants going strong), salad greens (hydroponically about 25 pounds harvested weekly), and a variety of other veggies. All the plants are open pollinated and or heirloom varieties and the growing methods are organic and sustainable. I sell to a market farmer who then sells to the public via a CSA and a couple local markets. I only pick what we eat and let him worry about the rest.
Angelskeep, I chuckled at your last comment because in another forum last year I coached some folks on making their own self watering containers. One of them finally got a beautiful "Kosovo" tomato in September and his wife called it the $250 tomato, because that's what he invested in the project. Most of my 'students' had much better results. The potting mix can be very expensive with large containers. I blend my own, but it still isn't cheap. I prefer using good old mother earth when possible.
I am not a fan of growing tomatoes or any plants upside down. I have used the method many times. I consider it a novelty. The psuedo science and false advertising in the Topsy Turvey ads gets under my skin.
I am a big fan of square foot gardening and my tomatoes are raised in a modified Mittleider Method -- very high density planting. You can google it to see just how little space you really need for a bountiful crop.
I'm happy to answer your questions. I participate in seed exchanges with farmers across the globe and happily mail free seeds of proven heirloom tomatoes to motivated backyard growers I meet in forums like this. It's not just generosity, it's keeping the strains alive and battling big ag's evil hybridization of the seed supply.