Cordon tomatoes - Time to snip the top off and call it a season?

My cordon tomatoes are doing well, but I am a bit worried that the trusses will not manage to mature, given they are outdoor.
Shall I snip off the top, and perhaps some of the leaves, so to encourage the plant to develop existing trusses before temperature and sunlight hours drop too much (I am in London) ?
Also, would it be a good idea to give them some additional fertilizer (molasses) and/or epsom salts?
At the moment the red ones (aviditas) are approaching 7 feet and keep growing and making flowers. I also let one develop two cordons, which was a silly idea given it made lots of small green fruits which are slow to develop.
Thanks for any advice!

 

Nice Toms Aldo

 

Thanks Pete
They are quite tasty, but perhaps a bit slow to ripen up.
Hopefully, they will manage to mature a bit more over the next weeks.
Next season I will try and plant them a bit earlier.

 

You have lots of time left Aldo, but only if the weather plays ball.
I can remember once picking outdoor toms in November, but in recent years blight has been a big problem for me outdoors.

 

Hi @Aldo please could you tell me what the black one in the last photo is? They look great!

 

Thanks, I will wait then.
I am crossing my fingers, regarding the early blight.
On one hand, it is my first year growing tomatoes, the plants are theoretically "blight-resistant" and there are no neighbours growing tomatoes, as far as I know.
But then, I read that the dreaded pest can travel miles with the wind, so, who knows..

 

Hi Caroline, that variety is called Indigo Rose.
I understand it was created by experimenting with cross pollination, and that apparently the first tomatoes might have been dark rather than red.
It is supposedly high in certain kinds of anti-oxidants but there have not been studies actually confirming benefits.
The fruits are green at the begininning but get dark when exposed to sunlight. If parts do not get much sunlight, they will stay green and then turn normal red when the fruit is ripe. With fully blackened ones it can be hard to determine when they are ripe, but they do actually change colour slightly when that happens.

It is very pretty, as you say, and it makes for a good talking point with guests
But it is not very productive or vigorous, and very slow ripening. Most of those tomatoes have been sitting there since June and only now a few are finally ripening.

I got mine from Suttons, grafted, for a fiver, but I think you can also buy seeds:
Tomato Grafted Indigo Rose (1) P10 at Suttons Seeds

 

I'd be tempted to stop them now so they swell and ripen. I'm starting to pick our outdoor baby plums when orange and pop them into trays in the GH to ripen in order to avoid the blight that has hit ours over the past three years. I subscribe to a blight warning site and there have been a few warnings over the last few weeks, but no sign of it on my toms yet !

 

Thanks, I was not aware that there were blight warning sites, I might subscribe to one just in case.
How does that work?
Users will report blight cases and if any are reported in your area, you get a warning?

 

Do an online search for Blightwatch and subscribe as an amateur grower.
You'll get email alerts when there's a Hutton Period - when temperature and humidity are favourable for the growth of blight.

 

@Dave W Thanks!

 

Thanks @Aldo. The only coloured one I have grown is the T&M Chocolate Cherry (I think), because the seed was half priced last year! It's not really chocolate colour but quite productive and a good flavour.

 

@CarolineL Thanks, I might give it a go next year, out of curiosity!

 

Thanks John, I will stop mine too then, given they are all outdoors.

I do have several l have grown from cuttings, which are still small but about to fruit, so I'll take my chance with those, at least for a few more weeks. They are on a pretty small patch and not too tall, so perhaps I might have enough transparent sheets to make a little tent around them if the weather gets suddendly bad.