Yes, I'd say too much Miracle Gro and maybe not enough sunlight.

If they are indeterminate tomatoes, they could possibly grow that much even without fertilizer.

I think over-fertilization could result in just such a situation. The plants put out lots of growth and foliage at the expense of fruit. Absolutely if it were me I would be cutting way back on fertilizer, especially anything high in nitrogen.

If the plants are not in full sun, don't expect much in the way of fruit.

Thank you for your note on this! It's a sunny back yard but I don't know if it is an all-day southern exposure or if the sun leaves the back yard for part of the day.

Thank you for all the comments - much appreciated! I just talked to our son, and he said he switched from regular Miracle Grow to a vegetable version when the tomatoes started appearing. The tomatoes are cherry tomatoes, and he said he has a ton of them but they are not green. They've been eating lots of tomatoes every day for 6 weeks. Lots of sun all day. 'Guess I won't worry about too much Miracle Grow. 'Just hope it is not unhealthy. Oh, and thank you, Patti, for your sweet note about "Cute little gramma's girls!" They definitely have stolen our hearts and make us laugh every day!

Cherry tomato plants can get huge. I had a "volunteer" grow 10 feet tall with no fertilizer at all and almost no water.

That's pretty amazing!

This is my Chocolate Cherry back in July:

It was started hydroponically in my Aerogarden, where it got fed almost according to directions (I'm terrible about feeding my Aerogarden on time), but since being in dirt it has gotten nothing but water. I think it's actually gotten a little bit taller since, but it also ran out of ladders. I have a Shimmer in the back that grows on a pea trellis, and it's also taller than me as well as sprawling widely; that one came as a seedling from Burpee and also has received no fertilizer from us.

If you start fertilizing, though, you probably can't stop completely, as the plant may be dependent on having some fertilizer, since that's the conditions that it grew in.

Thank you very much for the picture and extremely helpful information! 'Will pass this along to my son right away. Note: that is an amazing tomato plant!!!!!!

I too have a cherry tomato plant and I will probably soon have to use a ladder to pick them! They are "indeterminate", which means there's no telling how high they can grow! :) I wonder if we can prune them when they're young to keep them lower?

This is fascinating! Thank you for adding this comment.

I'm sure there are lots of YouTubes and blogs about how to best prune tomatoes. We did accidentally stunt one of ours by starting it in a shadier spot than its duplicate and in a smaller pot ... and container size does also have an effect.

Yellow Pear, Chocolate Cherry, and Sunpeach (Big Daddy pepper out on the cobbles):

And the other Sunpeach, which started outside too much behind that giant yew:

It also only has one ladder, so it goes out more than up ... and uses the neighboring azalea for additional support.

The pots in the first picture all look like the one the pepper is in, though they have large holes in the bottom and do run roots through. The orange pot is maybe an inch smaller in diameter; it just has regular drain holes and is recessed into the dirt by an inch or so to prevent toppling. The burgundy pot from the previous picture I posted is a couple inches larger in diameter but not enormous.

Shimmer in the back is in a huge 16" pot that we sunk so the soil level is equal with the ground, while still giving the water control, etc. of a pot (and avoiding construction debris from the porch build):

I mounded a good sized cereal bowl with ripe tomatoes off Shimmer yesterday, and there will be some more ripe in a couple days.