Perpetual Rhubarb in Southern California

Okay, I am a transplanted New Englander and obsessed with rhubarb. As mentioned in a different post here (on germinating rhubarb seeds), I have begun a trial with my fellow CRFG-WLA members of various rhubarb seeds in the hopes of recreating Luther Burbank’s success with Winter Perpetual Low-Chill rhubarb. I know the history and how his roots and patents passed from his estate to the Cleughs in Orange County, CA and then on to Mike Howarth, also in Orange County. In 1992, Mike’s land was sold for commercial development and – per David Karp – the roots were plowed under. Except I can’t help believing that some of Mike’s Valley Center neighbors may have managed to get their hands on a few of those historic roots. I know, until the Pandemic, I used to buy wonderful Cherry rhubarb from Laney Villalobos at our local farmer’s market. I would give anything to know if she is in fact growing a continuation of the Burbank line. Any Valley Center folks on here?