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.
Yes, "Sequoia" should be capitalized when referring to the California sequoia tree, specifically the species of giant redwoods found in California such as the Sequoiadendron giganteum.
Yes, "Great Northern bean" should be capitalized because it is a proper noun that refers to a specific type of bean.
Yes, "Northern Hemisphere" should be capitalized since it is a proper noun referring to a specific geographic region on Earth.
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.
Yes, when it is part of a proper noun or used in a specific geographic context (e.g., Northern Hemisphere, Northern Ireland), "northern" should be capitalized.
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.