Stopping tomatoes growing taller

Hi all,
My tomato plants have reached the top of my plastic growhouse.
Can anyone tell me how I stop them growing any taller?

Thanks
J

 

Pinch off the tip?

 

hi john
when you look at the top of your tomato plant you will see the growing point ,remove this and it will grow no taller,how many trusses do you have ?

 

I think I read somewhere its best to pinch out a couple of leaves above a flower truss (well, pinching out anywhere will stop it growing taller, of course, but might be worth avoiding sacrificing a truss unnecessarily)

 

Thanks for that all.
Pam, the number of trusses vary. From 3 to 5 on each plant.

 

Something that has 3 trusses now ought to be able to get to 5, and get them ripened, before the frosts come, I reckon. 5 is about normal unless you start Tomatoes early and with heat .

 

How many trusses should I expect from a cherry tomato plant?

 

Same. The trusses tend to be bigger (more fruits) but each fruit is smaller.

My personal opinion is that "number of trusses" concept is flawed, and stopping the plant "one month before the first frost" is a better metaphor for Greenhouse Toms. (Not sure about outdoor Toms, I don't grow them, but perhaps that translates into 6-weeks before first frost??