Why won't my peppers ripen?
 

I have had large peppers on various plants in my greenhouse now for
4-5 weeks:
- Paprika (about 14 cm long)
- Hot Banana (about 10cm long)
- Various sweet peppers
- Trinidad non-bell peppers

The Paprika and Chillis have stayed resolutely green all this time
(including some hot sunny periods in June/July). In the meantime the
Trinidad peppers have produced fruit which has turned red and ripened
nicely. Is there anything holding back the first two types?

Colin
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