They are considered a red (takes two years to produce acorns) but some say they are neither. Far as I'm concerned they are a red but have a very low tanin content apparently. Some will tell you they can become invasive, but I've been growing them 16 years and I WISH they would become invasive. All I know is if they aren't in full sun with a tube around them and you have more than 2 deer per square mile, they are NOT going to be invasive. No more so than chinese chestnuts.