Hazel,

Congratulations for growing caesalpinia in the U.K.!

The plants should be outside during your summer. They love heat. The first week you should have some afternoon protection for them or the leaves that have been used to the greenhouse light might burn. After that full sun.

Its not really age that determines when you'll get flowers. It how long a warm season you can give them. Here in southern California my caesalpinia put out buds in September. Then its a race to see if I'll get flowers before the weather cools off in November. If we have a warm November, the flowers will open. If the weather starts to cool (nights below 55 degrees F. or 12 C.), the flowers never really open and they just fall off.

Hello Cagary,Thankyou for your reply.
I don't think it will ever be a long enough hot spell for my plants to ever flower.By the time September comes here in the U.K. most plants are beginning to close down.I have a Pawlonia tree kept outside in a huge pot that is approx. 5yrs old.It forms flowers in autumn but they abort over winter so I never get to see them.I think this will be the same with my caesalpinias.Never mind global warming may change all that! We are having welcome showers here in the Midlands at last!Never satisfied!
Hazel.