By Selwyn5t
United Kingdom 
I have several tomato plants ( tumbler type ) which have produced a lot of fruit but none have started to ripen
31 Jul, 2016
Answers
Put a ripe banana skin near them. Bananas give off a gas that encouraged ripening.
31 Jul, 2016
Previous question
Nothing to worry about. They will all ripe very soon. I have been growing tumbler type tomatoes for many years and they ripe even under shade. Once started, they will all finish within two weeks.
31 Jul, 2016