Aloe Vera Turning Yellow: What's Going On?
As a common household succulent plant, the yellowing of aloe vera leaves is a problem that troubles many caretakers. When the once vibrant green leaves gradually fade to yellow, it often indicates that the plant is sending out a health warning. This article will analyze the top five key causes from aspects such as soil, nutrients, and sunlight, and provide systematic solutions.
One: Abnormal Soil Environment
1.1 Soil Hardening
When white salt deposits appear on the surface of the potting soil or water accumulates after watering, it indicates severe soil hardening. This situation can block root respiration and hinder nutrient transport. It is recommended to change the specialized succulent nutrient soil every spring and regularly loosen the soil with a bamboo skewer.
1.2 pH Imbalance
Aloe vera thrives in a slightly acidic environment with a pH of 6.0-7.0. Long-term use of tap water can alkalize the soil. You can adjust the pH once a month using diluted white vinegar water (ratio 1:50).
Two: Imbalance of Nutrient Elements
2.1 Potassium Deficiency Symptoms
Brown edges on old leaves are typical symptoms of potassium deficiency. It is recommended to use potassium-rich banana peel compost or apply potassium dihydrogen phosphate (diluted 1500 times) as a supplement. Note that nitrogen, phosphorus, and potassium should be supplemented in a balanced ratio of 2:1:3.
2.2 Iron Deficiency Yellowing
New leaves with yellowing between the veins may indicate iron deficiency. You can spray the leaves with chelated iron solution and combine it with mature rice water灌溉, doing this once a week for three weeks for visible effects.
Three: Improper Care Methods
3.1 Improper Light Management
Aloe vera needs 4-6 hours of scattered light daily. It can receive direct sunlight in spring and autumn but requires 50% shading in summer. Long-term shading can cause the leaves to become thin and yellow. It is recommended to adjust using a progressive lighting method.
3.2 Overwatering Leading to Root Rot
Water once every 20 days in winter, every 10 days in spring and autumn, and every 7 days in summer. If root rot is detected, immediately remove the plant from the pot, trim the roots, soak in carbendazim, and replant in new soil with陶粒 padding for better drainage.
Four: Environmental Factor Influence
4.1 Sudden Temperature Fluctuations
Temperatures below 10°C or above 35°C can cause physiological yellowing of leaves. Maintain temperatures above 12°C in winter and avoid direct air conditioning; in summer, enhance ventilation and cooling and use misting to increase humidity.
4.2 Pest and Disease Attacks
Scale insect infestations can cause local yellow spots, which can be physically removed with 75% alcohol cotton swabs. Root rot can be treated with zinc omethoate and the腐烂 tissue should be cut away.
By systematically checking the causes of yellowing leaves and taking corresponding measures, the plant can usually recover within 2-3 weeks. It is recommended to keep a care log, recording data such as watering and fertilizing, and dynamically adjust the care plan according to seasonal changes to keep aloe vera green all year round.