Hi,
I had to shorten my healthy longue d'aout.
It was getting me mad to throw the wood, so I cut the branches to 10/15cm (3''-5'') and potted them outside after 2 weeks in a bucket of water outside.
They always stayed outside... Believe me or not, I have small leaves on 3 of the stems. They were potted 6 weeks ago( already... time flies me by ... incredible ...) .
We didn't have frost since the 1st of March and temps have been between 4°C and 20°C (40°F - 68°F ), lately between 8°C and 25°C ( 46°F- 77°F).
If yours were started inside ... ... ... The decision is yours ... I would use a greenhouse used to start tomato seedlings .