Certified Professional Horticulturist (CPH) Practice Exam

When is the best time to re-pot a plant?

1. Any time is a good time

2. When the plant is dormant

3. When the plant is actively growing

4. When you find a prettier pot

The correct answer is: When the plant is actively growing

Re-potting a plant during its active growing season is generally the best practice, as the plant is more capable of recovering from the stress associated with the process. During this period, plants are engaged in photosynthesis and actively developing new roots and foliage, which allows them to adapt more quickly to their new container and soil. The increased metabolic activity supports a healthy response to the changes in environment, leading to improved growth and adaptation. Furthermore, when you re-pot during the growing season, you can effectively provide the plant with fresh soil, more space for root development, and a nutrient boost, all of which contribute to its overall vigor and health. If re-potting is done when the plant is dormant, while it is possible, it can potentially hinder the plant’s recovery and growth. The plant's energy is focused elsewhere during dormancy, which may slow down its response to the shift in conditions. Choosing to re-pot simply because the pot is aesthetically pleasing does not take into account the plant's health needs and may lead to unnecessary stress if done at the wrong time. Thus, timing significantly influences the success of re-potting, making the active growing season the optimal choice.