What is the recommended hole size when planting a solitary tree or shrub?

The recommended hole size when planting a solitary tree or shrub should indeed be wider than the root ball by two or three times. This practice is essential because a wider hole allows for better soil aeration and improves root expansion, promoting healthy growth. When roots have space to spread out, they can access more nutrients and water, which is crucial for establishing a strong root system.

Moreover, digging a wider hole helps to reduce soil compaction. Compacted soil can hinder root development and the overall health of the plant. By offering a larger area for the roots to explore, it also fosters a more competitive and suitable environment for the plant to thrive, as it can better establish connections to underground water sources and nutrients.

When the hole is only equal to or slightly larger than the root ball, roots may struggle to grow properly, possibly resulting in stunted growth or even plant decline. Thus, ensuring that the planting hole is adequately wider than the root ball is a key factor in successful tree and shrub planting.