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My tomato plant is about 6 months old and about a foot and a half tall.

How often should you prune your tomato plant during this stage? Is it possible to over prune the plant? I usually use the pinch method of removing stems.

About my tomato plant. This plant is potted and it lives in the hot sunny weather in north Texas.

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in addition to "bstpierre" answer, I think you might find the following helpful/useful: How should I prune my vine tomatoes? & What is the maximum number of trusses for a tomato plant? – Mike Perry Aug 29 '11 at 21:21
those are pretty small. have you been watering daily? fertilizing? – David LeBauer Aug 30 '11 at 3:56
up vote 9 down vote accepted

As a general rule, you can prune tomatoes every 7-10 days.

Yes, it is possible to over prune the plant. If you remove too many stems, you will reduce production. And you don't need to prune a determinate tomato -- they will stop growing at a certain height.

I wouldn't prune yours. At 6 months old, I'd expect it to be much larger than 18". Is it fruiting? (Mine are about 3 months old and 4-5' tall.)

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No fruit yet. I fear because it's been growing in indirect light in a balcony it's grown too slow and fall is coming quickly; but that's another question for another time. – chrisjlee Aug 30 '11 at 2:16
I don't know when you get frost, but if you have no fruit yet, it's probably too late. If you try for tomatoes next summer, you'll want to find a way to get them more light. – bstpierre Aug 30 '11 at 2:58
@bstpiere Most likely Late October/Early November. – chrisjlee Aug 30 '11 at 15:29
I was going to say there's something wrong with your plant if it is 6 months old. Most tomato varieties need between 60 and 90 days from seed to ripe. They need full, direct sun to grow properly, so indirect light on a shaded balcony just won't do. – psusi Sep 9 '11 at 20:33

What to prune is a lot more important than how often. If you know what to prune, you can't prune too frequently. Then you're better off pruning when sucker growth (and whatever else you want to prune) is small, so you reduce the amount of wasted growth. So it really depends on how fast the plants are growing.

In July, if the weather is good, and they're really taking off, I try to hit them a couple times a week. (I'm in New Hampshire.) Once a week would be fine, except I sometimes overlook suckers, and then I hate to prune them when they're a foot or more long, which they would be after two weeks. Once fruit growth has taken off in August, the plants slow down.

For bigger suckers, use pruning shears, not your fingers, to avoid pulling off a long strip of "skin" off the remaining stem. Which brings me to...

Fungus. If you get unexplained, sudden, yellowing and die-off, it's probably a fungus disease. If you can afford to pull the plant, do so immediately. If not, be careful when pruning nearby plants - try to minimize the chances that you'll introduce fungus spores into the wound.

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could you please expand on "what to prune"? – Mike Perry Aug 30 '11 at 21:43
Ah, I was trying to dodge that - opinions differ a bit. Here's one technique that's close to mine, from Johnny's Seeds. They should know better than me! – Ed Staub Aug 31 '11 at 0:16
Regarding what to prune, the first two points in the answer to this question are related. – Lorem Ipsum Aug 31 '11 at 2:19
+1, great answer. A couple of times a week is actually a good habit -- "the feet of the gardener are the best fertilizer"... – bstpierre Sep 9 '11 at 21:11

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