Red Seal Landscape Horticulturist Practice Exam

How can you determine the ideal planting depth for a given plant?

1. By measuring the height of the plant

2. By considering the plant's root system and specific planting guidelines

3. By the size of the planting hole

4. By the time of year

The correct answer is: By considering the plant's root system and specific planting guidelines

Determining the ideal planting depth for a specific plant primarily involves considering the plant's root system and specific planting guidelines. Each type of plant—be it a tree, shrub, or perennial—has unique requirements based on its physiology and habitat adaptation. The root system plays a crucial role, as it needs adequate coverage in the soil to access nutrients and water while ensuring that the root collar (the area where the root meets the stem) is positioned correctly to avoid rot or other complications. Additionally, specific planting guidelines for each species will outline the optimal depth to encourage healthy growth and establishment. Other factors, such as the height of the plant, can provide some context but are not definitive for depth, as plants can vary significantly in size even within the same species. The size of the planting hole matters to accommodate root spread but again does not determine planting depth. The time of year is relevant to some aspects of planting, such as seasonality for rooting, but it does not dictate the specific depth at which a plant should be placed in the soil. This reinforces that understanding the particular needs of the plant in relation to its root system and cultural practices is essential for successful planting.