Please help

It's challenging to diagnose specific issues without more details or visual information, but there are several common factors that could contribute to a plant's declining health, especially during the transition to the flowering stage. Here are some possibilities and things to consider: Nutrient Imbalance: Even if you are feeding all plants the same, individual plants can have different nutrient needs. It's possible that this particular plant is more sensitive to nutrient imbalances or deficiencies. Consider checking the pH of the soil or nutrient solution to ensure it's within the appropriate range for cannabis cultivation. Lighting Issues: Changes in lighting, such as intensity or duration, can affect plant health. Ensure that all plants are receiving consistent light levels and that there haven't been any recent changes in the light setup. Also, consider the distance between the lights and the plants to prevent light burn. Environmental Conditions: Temperature, humidity, and airflow can significantly impact plant health. Make sure that the environmental conditions are consistent for all plants. Sudden changes in environmental factors can stress plants and affect their growth. Pests and Diseases: Check the affected plant for signs of pests or diseases. Look for pests like spider mites, aphids, or whiteflies, and inspect the leaves for discoloration, spots, or unusual patterns. If you notice any pests or signs of disease, take appropriate measures to address the issue. Root Health: Problems with the roots can impact nutrient uptake and overall plant health. If possible, inspect the roots for any signs of rot, discoloration, or unusual smells. Make sure the plant is not sitting in waterlogged soil. Genetic Variation: While you mentioned that the plants are the same strain, there can still be genetic variation within a batch of seeds. Some plants may be more resilient or have different requirements than others. Stress During Transition: The transition from the vegetative stage to flowering can be stressful for plants. They undergo significant changes in terms of nutrient requirements and light cycles. Some plants may be more sensitive to these changes than others. For a more accurate diagnosis, it would be helpful to have additional information, such as pictures of the affected plant, details about the growing environment, and any recent changes you've made to the cultivation setup. If the problem persists, you may want to seek advice from a local gardening expert or an online community with experienced growers who can provide insights based on specific details.