Fascinating Fact:
Nutrient deficiencies can show as poor growth or leaf colour changes, such as yellowing between veins. Too much fertiliser can also cause problems, including scorched roots.
Physiological disorders are plant problems caused by the environment or growing conditions rather than by insects, fungi, or bacteria. Common triggers include incorrect watering, poor drainage, low light, sudden temperature changes, compacted compost, and imbalanced feeding. Symptoms can look dramatic, such as yellow leaves, brown tips, leaf drop, cracking fruit, or stunted growth, but the key is to check patterns. If many plants show the same issue at once, or the problem matches recent changes in weather or care, it is often physiological. Improving drainage, adjusting watering, and feeding little and often usually helps plants recover.
Key Terms
- Physiological disorder: A problem caused by conditions, such as water, temperature, or feeding, rather than by a pest or disease.
- Drainage: How well excess water can leave soil or compost, helping roots get air as well as moisture.
- Chlorosis: Yellowing of leaves when a plant cannot make enough chlorophyll, often linked to nutrients or root stress.
Frequently Asked Questions (Click to see answers)
What is a physiological disorder in plants?
A physiological disorder is damage caused by growing conditions, such as too much water, too little water, temperature stress, or incorrect feeding, rather than by a pest or infection.
How can I tell if yellow leaves are a nutrient issue or overwatering?
Nutrient issues often show as pale leaves or yellowing between veins, while overwatering usually comes with limp growth, slow drying compost, and possible root smell. Checking drainage and roots helps.
Can too much fertiliser really damage plants?
Yes, excess fertiliser can draw water out of roots and scorch them, leading to brown leaf edges, wilting, and poor growth. Watering through and reducing feeding can limit further harm.
Try These Related Quizzes
