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I always have to think about this one because for some reason I get them mixed up. This time I'll be sure to get it right.
Determinant tomatoes are bush tomatoes. They will grow to a height of maybe 3 feet or so and you do not want to prune them. Determinant plants will stop growing when the top bud is pollinated and once that happens all of the fruit will begin to ripen. The ripening usually takes about 2 weeks but the point is that all of the plant's fruit will ripen at about the same time.
Indeterminant tomatoes are vine type tomatoes. They require support and if you want to you can prune them, though I don't think it makes any difference if you do or if you don't. These tomatoes will grow tall, some say up to 8 feet or more. I don't think I've ever grown any taller than 5' myself. The thing about these tomatoes is that they will continue to grow and produce fruit right up until something kills them, frost usually. Their fruit ripen all season once they get started.
Now, who would want to grow the different types? Well, if you were a commercial grower the only plants you would have any interest in would be determinants. You don't want the labor expense of staking them, you want to get out there one time and pick your crop (once again, labor cost issue) and when you do you want them all to be at the same stage of unripeness so they can be hard as stones - essential for shipping in crates where they are stacked more than 4 deep. Taste be damned, let 'em ripen on the truck. Here is an observation for you, not 100% accurate to be sure, but not too far off either. Most of these tomatoes grow to about the size of a beer can top and they are hard as golf balls. Generally speaking they have less taste than indeterminants but to make up for it they are also pretty good about not splitting and they do ripen to a beautiful rich red color. Where these tomatoes really shine is if you can. Because they all come on at the same time you get to do your canning and be done with it. Those of you who have spent the searing days of August in a steaming kitchen full of boiling water and every burner doing duty, peeling, chopping, filling quart after endless quart will appreciate the determinants.
Indeterminant tomatoes tend to do their own thing independent of your wishes. They will grow enormous fruit, often oddly shaped too. They tend to be tangy fruit, just the thing for people who like to bite into a tomato and have it bite back a little bit. When you grow indeterminants you will be picking tomatoes all season long. That's nice unless you happen to can. Unless you overplant its difficult to have enough ready to do at the same time with indeterminants.
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