I only have experience growing organically in Hawaii, so my tomatoes might last about as long as mainland ones do, or shorter, usually brought down by disease after a reasonable harvest period, since I don't use any chemicals. The frequent night rains and humidity encourage fungal disease, and the abundant year-round pests help to spread disease or cause entry wounds. However, I can just keep replanting, and grow tomatoes all year round.
There is a variety, Peron Sprayless, that I have yet to try... this is supposed to be extremely disease tolerant, so I am curious how long this one can keep going.

Thanks for the reply. I will forward this to him. I wish I was in Hawaii right now, it's my favourite place in the world! I love Foster's garden and Lyon Arboretum. Cheers, Joe

I am on Oahu's Windward side fronting a small lake/pond, so the weather is moderate compared to other parts of Hawaii. I've tried growing tomatoes before in another part of our town that was much hotter. The birds usually got to the tomatoes before we could, along with caterpillars, slugs, etc. We just moved to this area and in the spring I planted a small 4" potted roma tomato I got from a local nursery. I put it into a very large pot where I had a huge healthy basil plant, as the tomato grew the basil curled up and died. Later I found out that the tomato sucked the nutrients out of the soil. My roma has been growing and producing all summer long! My question is: When will it stop? It is in front of a fenced lanai so after it out grew the tomato cage, I began tying it up to the fence, it is over 12 feet wide! Yikes, when will it stop? I am thinking of pulling it up soon - at least by October, is that a good thing?

Why pull it up? It's making tomatoes isn't it? It could last for several years and tomatoes are tasty! If it is taking up too much space, just send the vines back the other way.

The only reason to pull up a tomato plant is if it isn't making tomatoes anymore or if it has died.

Novice at growing tomatoes. Why are there few to no flowers on my plants? Square foot gardening type soil, organic compost, drip irrigation. Is it too hot for flowering in July/August? SanMarzano and Burpee Big Boy plants from seedlings purchased at Home Depot.

The plant may not be old enough to make flowers yet? Otherwise, it may lack some nutrients, but if you have compost, then there should be all the nutrients available. How long have you been waiting for the flowers?