I'm growing a Princeton elm in my front yard that's supposedly resistant to Dutch elm disease. It was a 6 foot twig a year ago, but a single growing season had

I'm growing a Princeton elm in my front yard that's supposedly resistant to Dutch elm disease. It was a 6 foot twig a year ago, but a single growing season had it shoot up to what must be 12 feet or more with it quadrupling in thickness. Hopefully in 5 years it will be providing nice shade. They're trying to do the same with the chestnut in finding a suitable hybrid. It's such a shame that we've lost so many of our best trees.