No, "northern" typically does not need to be capitalized unless it is part of a proper noun like "Northern California" or is at the beginning of a sentence.
Sequoia should not be capitalized. California should instead.
Yes, "Northern Hemisphere" should be capitalized since it is a proper noun referring to a specific geographic region on Earth.
Yes, "Great Northern bean" should be capitalized because it is a proper noun that refers to a specific type of bean.
Yes, "Northern" should be capitalized in "Northern Pacific" as it is referring to a specific region or direction.
Yes, the term "California condor" is capitalized because it refers to a specific species of bird, which is the largest land bird in North America.
Yes--While the word hemisphere alone is not capitalized, a specific hemisphere (western, eastern, northern or southern) is.
Worry about your grammar first. But no, I reckon not.
Yes, "Northern Hemisphere" should be capitalized as it refers to a specific geographical region.
It is capitalized at the beginning of the sentence or when it forms part of the proper noun. Examples: Northern Australia I'll go to the northern part of the valley.
Yes, the word "Northerner" should be capitalized as it is referring to a specific group of people from the northern region of a country.
It is northern Wisconsin.