I'm new to vegetable gardening so thank you.

From what I have read in the past from Florida Gardeners, yes it is too late for planting now to beat the heat and the blossom drop that results. You have 2 tomato growing seasons down there - Fall and Winter to very Early Spring.

As to container sizes, Better Boy is a very large indeterminate variety that can easily grow to 6-8 feet tall or taller and will need a very large container (7-10 gallons minimum is common) and good support. I linked a picture of an average plant below.

Dave

Let us know how it goes as nothing beats a try.

Not from the heat if you keep them watered. The Better Boy is a tough variety and will definitely survive the heat if taken care of. They just get so big they need lots of room to grow.

If you can find a spot that gets good sun in the morning and mid-day, then shade in the afternoon when its really hot, the plants will do better.

When daytime temps rise consistently above 95 or night temps above 75, the blooms will fall off and you won't get any fruit set. But the plant will continue to grow and bloom and when cooler weather comes, the plant will start producing tomatoes again.

You should plan on giving each plant at least one gallon of water every 4-7 days as required to keep soil moist.

I already answered this above. A 10 gallon pot for each plant, filled with a high quality soil-less potting mix, a supporting cage at least 4' tall, watered and fed regularly, and kept in partial sun/shade should survive until it is cool enough to produce fruit IF it doesn't get a disease or develop a problem with pests in the meantime.

The point is you are starting out with 3 strikes against you already: 1) wrong planting time for Florida, 2) trying to grow an indeterminate variety in a container, 3) lack of knowledge/experience. Odds of success are slim but it can be a good learning experience.

Dave