Tomatoes ripening

I can't seem to get my tomatoes to ripening They are a good size but very little sign of colouring up. Any ideas on this? Ta Andre

 

They need heat to ripen, are they in a greenhouse?

 

Yes grown in a greenhouse. I did wonder about light levels though.

 

Out of about 15 Shirley tomato plants (might be more) I've only had 3 ripe tomatoes.

I have already been reducing watering (and feeding with tomato feed when I do)' taken out growth above uppermost viable trusses, removed leaves up to first truss then go above second truss, closing polytunnel doors overnight and they still refuse to ripen.

With that many plants I thought I'd be spoilt for choice selecting 6 for the village show on Monday, but I've had to abandon my plans for that.

Luckily I have plenty more plants of other varieties that are cropping well so lots to eat.

 

My incas are ripening outside Ok and have been for the last three weeks.
I'm not sure it is about heat or sunshine.
Mainly down to variety and length of growing time I tend to think.

Once one starts to ripen they all seem to join in

 

Been growing them for about 5 yrs now.
Always ripen early and reliable.

Got blight now though so I doubt I'll still be picking in Oct this year like I was last year.

 

To grow good tomatoes you need lots of sunshine and enough water

 

Agree with Pete about growing time and variety.
I had 9 plants this year and had tomatoes before mid summer. Prolific cropping from gardeners delight and Shirley until early September and every tomato ripened.
A couple of GD I gave to my nephew, a novice gardener, also produced well.
The season itself, an early start that we get here anyway, not excessively watering, keeping foliage dry and good ventilation works for me :rasp: