At what age, or size, or temperature conditions, do morning glories
start to flower?

I have four or five varieties, in various places around the yard, in
various soils. Some are in the ground, some are in pots. Some of them
started from seed, some came as starters from the greenhouse.

One of them is seven feet high.

The weather here has been mostly in the 70s and 80, but once got up to 91.

When can I expect them to flower?

Or do you think I'm doing something wrong?

Thank you,

Ted Shoemaker