Yellowish leafs

Yellowing leaves in cannabis plants can be caused by various factors, including nutrient deficiencies, overwatering, pH imbalances, pests, diseases, or environmental stress. Since the issue started in the vegetative state and persists into flowering, it's important to identify and address the underlying cause to prevent further damage to your plant. Here are some potential causes and steps you can take to troubleshoot the issue: 1. **Nutrient Deficiency**: Yellowing leaves can be a sign of nutrient deficiencies, such as nitrogen, magnesium, or iron. Evaluate your nutrient regimen and ensure your plant is receiving adequate amounts of essential nutrients for both vegetative and flowering stages. Consider adjusting the pH of your nutrient solution to ensure optimal nutrient uptake by the roots. 2. **Overwatering or Underwatering**: Improper watering practices can lead to nutrient imbalances and root problems, resulting in yellowing leaves. Make sure you're allowing the soil to dry out slightly between waterings and adjust your watering frequency and volume accordingly based on the plant's needs and environmental conditions. 3. **pH Imbalance**: Fluctuations in pH levels can interfere with nutrient uptake and cause nutrient deficiencies or toxicities, leading to yellowing leaves. Use a pH meter to monitor the pH of your water and nutrient solution and adjust it to the appropriate range for cannabis cultivation (typically between 6.0 and 6.8 in soil). 4. **Pests or Diseases**: Inspect your plant carefully for signs of pests such as spider mites, aphids, or thrips, as well as symptoms of fungal or bacterial diseases. Treat any infestations or infections promptly with appropriate organic or chemical controls to prevent further damage to your plant. 5. **Environmental Stress**: Environmental factors such as temperature fluctuations, humidity levels, light intensity, or poor air circulation can stress plants and cause yellowing leaves. Ensure your grow environment is properly ventilated, maintain stable temperature and humidity levels, and provide adequate light for healthy growth. 6. **Genetic Factors**: Sometimes, yellowing leaves can be attributed to genetic factors or variances between individual plants. If all other potential causes have been ruled out and the issue persists, it's possible that the affected plant may simply be more sensitive or prone to yellowing than the others. By carefully assessing and addressing these potential causes, you can hopefully identify the reason for the yellowing leaves in your cannabis plant and take appropriate measures to remedy the issue and promote healthy growth throughout the flowering stage. if you check my latest tangerine dream, she has been going through the same weird yellowing, and yet she is just fine. At times the answer is that there is no answer: that s how that pheno is showing itself

Agree that the diary would help. Calmag def and looks to have been coming on for a while. Whole plant so definitely nutrients or root issues. It all looks like overwatering type deficiencies to me. This means not enough drainage, watering too often , both. No oxegen at the roots, causing poor transpiration, can be the cause of all kinds of deficiencies. The plant in the upper left has yellow necrotic leaves as well deep inside and lower only. I sometimes see this last 2 weeks of flower usually where there's poor air flow and older leaves are getting cannibalized as im cutting back on nutes. Results of flushing..

Start a diary.....it could be a variety of reasons, but without knowing what exactly you are or are not doing,......generic answers like "give more cakl/mag" is about as good as it gets.

Looks like a magnesium deficiency to me. You seem to be having it on the plant in the back as well. Check your pH to be safe and give her some calmag until she heals