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Wisteria normally do not make good container plants because they grow too big and too fast. But that being said, in terms of cold, if you live in Zone 5 or higher, it should be fine in a container with no extra care, but if you live in Zone 4 or lower, it will need extra protection. If you are in Zone 4, wrapping it in burlap and hay or leaves or moving it near a south facing wall should protect it enough for the winter. In Zones 3 or less, you would need to move it to a protected area, like an attached garage.

Established in-ground plants require little, if any care over winter. Here is more information on winter care for these plants: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-winter-car.htm

Wisteria normally do not make good container plants because they grow too big and too fast. but, that being said, if you use a large enough tub, the vine should be ok in a container. Also, I would make certain that the trellis is going to be sturdy enough to hold its weight as the vine grows larger.

Wisteria normally do not make good container plants because they grow too big and too fast. but, that being said, if she uses a big tub, they may make it. It won't stay small though.

In terms of cold, if you live in Zone 5 or higher, it should be fine in a container with no extra care but if you live in Zone 4 or lower, it will need extra protection. If you are in Zone 4, wrapping it in burlap and hay or leaves or moving it near a south facing wall should protect it enough for the winter. In Zones 3 or less, you would need to move it to a protected area, like an attached garage.

In terms of the heat, once temps go above 85 F, the container must be watered twice a day. And if they go above 100 F, three times a day is not too much.

Wisteria normally do not make good container plants because they grow too big and too fast. That being said, an established wisteria typically does not need any winter care, but since yours is a new planting, wrapping in burlap will help ensure it makes it through the winter.

In terms of cold, if you live in Zone 5 or higher, it shuold be fine in a container with no extra care but if you live in Zone 4 or lower, it will need extra protection. If you are in Zone 4, wrapping it in burlap and hay or leaves or moving it near a south facing wall should protect it enough for the winter. In Zones 3 or less, you would need to move it to a protected area, like an attached garage.

Wisteria normally do not make good container plants because they grow too big and too fast. But, that being said, you can still grow wisteria in pots though the standard variety may be better than the trailing types. Pruning will keep the plant's size under control, as well as the pot's overall size--which should be large enough to accommodate the large root system. You'll also want to make sure it provides adequate drainage.

First, I would check the roots since it's in a container. Normally, these don't make the best container plants as they need lots of room to grow. If the roots are constricted, it may need to be repotted (2 inches larger) or transplanted elsewhere.

In addition, I would guess that the nitrogen to phosphorus ratio is off. The soil may have an abundance of nitrogen, which would result in nice, healthy green growth but little to no blooms. Without the right amount of phosphorus, it will not bloom well. Bone meal is a great way to add phosphorus. This article will also help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm