GETTING TO KNOW US

Air Pruning

In Nature, the chances of seeds germinating and developing into large specimens are rare. We expect losses due to rodent and insect predation, and unfavorable weather and soil conditions. By collecting seeds we can vastly increase germination and growth rates.

What I want to focus on is root development. Everything for future growth depends upon root orientation. What we do not want to see is roots and root hairs deflected down and encircling the pot. Nor do we want to see bent taproots. It is poor root development that is detrimental to our efforts to mitigate climate change. As we plant more and more trees to offset climate change we are finding that 50% of planted trees will not reach 13-20 years of age. Not good statistics for all our hard work. The key is to plant high-quality trees with healthy root systems.

Proper root orientation is roots radiating away from the trunk. Improper orientation will lead to roots circling too close to the trunk, roots embedded in the trunk, or roots crossing over main roots. These misaligned roots can reduce water, nutrient, and sugar uptake at these junctures.

So how do we produce high-quality root systems? As growers, we can use techniques and products to optimize root orientation and growth. Most of these products are based on the principle of air pruning. When roots grow into the open air, their tips die and they stop growing. This is what we need for good root development. We want the roots, when they encounter the edge of the pot, to stop growing and not encircle the pot. Once these root tips die due to exposure to air, they produce branching, fine-feeder roots that gather air and nutrients.

Thankfully, the nursery business now has access to specially designed growing systems, from germination trays to pots, that incorporate these air pruning fundamentals. Bottom line – look for air rooted products for a healthier, happier plants.