Can triffids survive in the Arctic Ocean?

1. Below Freezing Water Temp

1.1. Die because some plants cannot survive freezing temperatures.

1.2. Survive because the book stated that the triffids could live in freezing temperatures.

1.2.1. Enough carbon dioxide in water

1.2.1.1. Die because plants need carbon dioxide to survive.

1.2.1.2. Survive because carbon dioxide is in the ocean as a dissolved form of inorganic carbon.

1.2.1.2.1. Sufficient food supply