I have this huge grapefruit tree in my garden. It is at least 30 feet high and just as wide.  It must be at least 70 years old and yields hundreds of pounds of grapefruit annually. The variety is an old standard variety called "Marsh." Marsh grapefruit were introduced in Florida in 1860 and it has been in the industry ever since. It is relatively cold hardy variety and has survived many hard freezes here in northern California. Even though our grapefruit tree gives us a lot of fruit and it has a very long harvest period (February to August), I have to say it isn’t the best tasting variety of grapefruit I have ever had. No, that honor would go to some of the more recent grapefruit introductions. There are several hybrid...