Why Are the Chrysanthemum Leaves Turning Yellow
Chrysanthemum, as a common ornamental plant, yellowing leaves are the most common problem that occurs during maintenance. This article systematically analyzes the six main causes of yellowing leaves in chrysanthemums, combining professional maintenance experience to provide you with actionable solutions.
One: Imbalance in Soil Environment
1.1 Improper pH Level
Chrysanthemums thrive in slightly acidic soil with a pH value of 6.0-6.8. When the soil becomes alkaline (pH > 7.5), iron is fixed, causing the leaves to lose their green color. You can test the soil pH with litmus paper.
1.2 Soil Compaction and Oxygen Deprivation
Long-term lack of potting can cause soil compaction, hindering root respiration. It is recommended to change the substrate every 2 years, using a mixed formula of decomposed leaf soil + perlite + vermiculite (5:3:2).
Two: Improper Water Management
2.1 Root Rot Due to Waterlogging
Exceeding 500ml of water per day can lead to root rot, initially causing leaf veins to turn yellow, and later the whole leaf to wilt. Use the bamboo stake test method: insert into the soil for 5 minutes, and water if there are no moist traces.
2.2 Drought and Dehydration
Continuous lack of water for more than 3 days causes the older leaves to turn yellow and curl first. In the summer, it is necessary to spray the leaves early and late to maintain an air humidity of >60%.
Three: Deficiency of Nutritional Elements
3.1 Symptoms of Nitrogen Deficiency
The lower leaves turn yellow evenly, and the new leaves become smaller. It is recommended to apply a urea solution (0.2% concentration), fertilizing every 10 days.
3.2 Iron Deficiency leading to Yellowing
The leaf flesh of new leaves turns yellow while the veins remain green. You can spray chelated iron (EDTA-Fe) 1000 times solution, twice a week.
Four: Misconceptions in Light Management
Chrysanthemums are short-day plants, but they should receive 6-8 hours of sunlight per day. Long-term placement in a dark environment (<2000lux) can lead to insufficient photosynthesis. It is recommended to use a lux meter to monitor.
By systematically controlling the soil environment, precisely managing water and fertilizer, and properly adjusting light intensity, combined with regular pest and disease control, the yellowing of chrysanthemum leaves can be effectively prevented. It is recommended to conduct a full plant check every month, establish a maintenance log, and record key data such as temperature, humidity, and fertilization to achieve scientific and meticulous management.