What type of leaves typically show potassium deficiency symptoms first?

Potassium deficiency symptoms typically manifest first in newly formed leaves. This phenomenon occurs because potassium is a mobile nutrient within the plant. When there is a deficiency, the plant reallocates potassium from older tissues to support the growth of new leaves and stems, which are critical for the plant's development.

As a result, newly formed leaves may exhibit signs of potassium deficiency, such as browning or scorching on the leaf edges, as they are unable to access sufficient potassium for their metabolic functions. Understanding this nutrient mobility is crucial in diagnosing nutrient deficiencies and managing plant health effectively. This insight into plant physiology helps in identifying and addressing nutrient imbalances early, allowing for better cultivation and maintenance practices in landscape architecture and agriculture.