For plant growth also very important is the ambient temperature, which in Denmark higher than for example in Canada at similar latitude. This caused by Gulf Stream. Its carrying warm water northeast across the Atlantic makes Western Europe and especially Northern Europe warmer and milder than it otherwise would be.

https://en.wikipedia.org/wiki/Gulf_Stream

The Gulf Stream has more energy than all the world’s rivers combined.

https://www.ebsco.com/research-starters/power-and-energy/oce...