The Remarkable Kindred Spirit® Hybrid Oak: A Testament to Innovation and Resilience

Garden Gate AI Writer
October 19, 2023

In the world of trees, there exists a magnificent specimen that is more than just a symbol of natural beauty; it's a testament to human ingenuity and nature's resilience. The Kindred Spirit® Hybrid Oak, scientifically known as Quercus x warei 'Nadler,' is a unique and captivating oak hybrid that has captured the hearts of tree enthusiasts and conservationists alike.

The Birth of a Hybrid

At its core, the Kindred Spirit oak is the result of a fascinating botanical experiment. In this case, the parents are no ordinary oaks. The Quercus robur 'Fastigiata,' commonly known as the Upright English Oak, and the Quercus bicolor, known as the Swamp White Oak, came together in a remarkable union to create a new oak species, Quercus x warei.

A Name to Remember: Kindred Spirit®

This remarkable oak hybrid is known by the trade name Kindred Spirit® Hybrid Oak, officially designated as Quercus x warei 'Nadler.' It's important to note that this tree is not only unique in its genetic makeup but also legally protected under United States Plant Patent #17604. This recognition ensures that the Kindred Spirit oak retains its distinctiveness and remains a valued contribution to the world of horticulture.

Kindred Spirit Oak Trees at Garden Gate Nursery
Kindred Spirit Oak Trees at Garden Gate Nursery

The Visionaries Behind the Patent

The journey of the Kindred Spirit oak wouldn't have been possible without the dedication of Mr. Earl Cully and Mr. Joshua Nadler. In 2005, they applied for the plant patent that would later be granted in 2007 by the United States Patent and Trademark Office. Their vision and commitment to preserving this exceptional tree have left a lasting mark on the world of arboriculture.

Growth and Vigor

One of the most remarkable features of the Kindred Spirit® Hybrid Oak is its growth characteristics. The ortet, or parent tree, stands proudly at 35 feet tall with a limb spread of 6 feet at the age of 30 years. This not only showcases its impressive size but also hints at its fast-growing nature. The tree exhibits heterosis, a phenomenon known as hybrid vigor, which contributes to its rapid development. This growth rate makes it a favorable choice for various landscaping and forestry applications.

Defying Powdery Mildew

One of the challenges that often plague oak trees, particularly those with Quercus robur parentage, is powdery mildew. However, the Kindred Spirit oak stands strong against this fungal menace. Its high resistance to powdery mildew makes it a robust and low-maintenance choice for those looking to add the beauty of oaks to their landscapes.

Sister Seedling: Regal Prince® Hybrid Oak

In the same batch of chance seedlings collected from the University of Missouri – Columbia campus, another remarkable oak emerged. Known as Regal Prince® Hybrid Oak (Quercus x warei ‘Long’) and protected under Plant Patent #12673, it shares a common origin with the Kindred Spirit oak. This sister seedling offers its unique set of attributes, adding diversity to the world of oak cultivars.


The Kindred Spirit® Hybrid Oak, with its fascinating heritage, rapid growth, and resistance to powdery mildew, stands as a living testament to the potential of human innovation in the realm of trees. It serves as a reminder that, with careful planning and dedication, we can create hybrids that not only defy nature's challenges but also enrich our landscapes and communities. Whether you're an arborist, a tree enthusiast, or simply a lover of nature, the Kindred Spirit oak is a tree to be celebrated and admired for its exceptional qualities and the dedication of those who brought it into existence.

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