Question

Cold weather slows down a plants growth.

Answer 1

Uh there is no question but your statement is true, extremly hot or cold weather conditions could cause the plants growth to slow down. But the tempretures vary depending on the type of plant.

Answer 2

I don't see a question but what you said is correct. Plants will die in cold weather. Cold weather, particularly frost, causes the water in plant cells to freeze, damaging the cell wall. Roots are unable to take up water and plants die from lack of moisture. Periods of cold, frosty weather during April and May can also kill blossom and damage fruit.

Hoped it helped :D