A good time to fertilize is during peak shoot and root growth period of spring and fall.

• A. Spring and fall during peak growth
• B. Summer drought
• C. Winter dormancy
• D. Any time it rains

Answer: (A)

Fertilizer is most effective when the plant is actively growing and its roots are expanding, because nutrients are quickly taken up and used to build new tissue. In spring and fall, plants are in their peak growth phases, so applying fertilizer at these times supports shoot and root development and leads to better use of the nutrients.

Fertilizing during winter dormancy means the plant isn’t actively taking up nutrients, so the fertilizer is wasted and can even cause damage if it sits in the soil. In a summer drought, uptake is limited, so nutrients can accumulate in the soil or be lost when moisture returns, rather than supporting growth. Relying on rainfall alone isn’t reliable for timing because rain can cause nutrient runoff or leaching and doesn’t guarantee that conditions are ideal for uptake. That’s why the best time is during the spring and fall when growth is active and moisture availability supports nutrient absorption.