What to Do When Plant Leaves Turn Yellow? A Complete Guide to Solutions
For those who grow flowers and plants, yellowing leaves are a common sight. Why do leaves turn yellow? There are three main reasons: overwatering and waterlogged roots; lack of light; and nutrient deficiency chlorosis. How do we solve the problem of yellowing leaves? Let's take a look together.
Using ferrous sulfate to improve the soil
There is a situation where the soil lacks none of the various elements, yet the plant still suffers from nutrient deficiency chlorosis. There are two reasons for this:
First, the soil lacks these elements. Organic matter is the main source of trace elements in soil. If no fertilizer is applied for a long time or only inorganic chemical fertilizers are used, organic matter gradually decreases, causing a deficiency of trace elements. If this is the case, simply increase the application of organic fertilizer. Gardening enthusiasts with the means and good hands-on skills can use various kitchen scraps to ferment and make their own organic fertilizer. If conditions do not allow, you can buy a full-element organic nutrient solution.
There is another situation where, although the soil lacks none of the various elements, the pH value is too high and the soil has become salinized and alkaline, causing various elements to solidify into substances that are difficult to dissolve in water. Plants cannot absorb them, and over time, symptoms of nutrient deficiency and yellow leaves appear.
If highly hard water is used for watering over a long period, this situation easily occurs. In this case, ferrous sulfate can be used to improve the soil and lower the pH value.
Supplementing iron to solve the yellow leaf problem
Iron deficiency in plants causes leaves to turn yellow. When the iron content in the soil is low and insufficient to supply what the plant needs, nutrient deficiency chlorosis occurs. If a plant is chlorotic due to iron deficiency, you can use a 0.2% ferrous sulfate solution to drench the roots and spray the leaves to supplement iron. Since ferrous iron (divalent) easily reacts in the air to become ferric iron (trivalent), and plants do not easily absorb ferric iron, the ferrous sulfate solution should be prepared and used immediately.
In summary, it is clear that ferrous sulfate plays an important role in plant growth. Ferrous sulfate has two main functions: improving soil and supplementing iron. Therefore, to solve leaf chlorosis caused by iron deficiency, consider using ferrous sulfate.
How to Handle Yellowing Lower Leaves on Succulents?
Yellowing of the lower leaves of succulents is a problem many people encounter when growing succulents. So can these leaves be pulled off? Zuihua Network tells everyone today that, in fact, it is a natural phenomenon for the outer leaves to slowly dry up one by one, ring by ring. But why does this phenomenon occur?First, to prevent succulents from becoming leggy, we do not give them much water. If we watered the succulents every few days, their lower leaves would certainly not turn yellow and would always be plump; not only would they lose their shape, but they would also keep growing taller, and some would even develop a "skirt." That is because the new leaves above have nowhere to go, and if the lower leaves are not consumed, they can only keep being pushed downward.
Of course, in many natural environments, the water available for succulents to absorb is also limited, which is why succulents store water in their own leaves for future use. Cacti are a very good example. But if we do not give them much water, what do they do when they are short of water? Naturally, they absorb water from their own leaves to continue surviving. The yellowing leaves actually still have water inside that has not been fully absorbed. In fact, they still contain a large amount of water for the succulent to absorb. If we pull off the leaves at this time, the plant will have to find a new place to absorb water again.
Second, those dry, yellow leaves actually still store some nutrients. Do not underestimate those few soft, yellowing leaves. Sometimes one or two leaves do not make much difference, but accumulated over time, a lot of nutrients are wasted. In addition, succulents actually do not need much nutrition to begin with; the nutrients they produce themselves are enough for their own use. So pulling them off is actually a waste.
So when exactly can they be pulled off?
This kind of situation means they can be removed. You can clearly see that although the leaf is still a little soft, it has actually already dried up.
In fact, at a certain stage, old leaves can be pulled off so they do not affect the appearance, but you must make sure it is the right time. Generally, after the nutrients in the leaf have been completely absorbed, the remaining leaf will finally become thinner and drier, and older ones may even crumble at a touch (usually seen on succulents grown outdoors). Of course, we do not have to wait until they crumble at a touch to pull them off, but we also must not be impatient.
Through the detailed introduction in this article, we hope all gardening friends can correctly handle yellowing succulent leaves. Welcome to continue following Zuihua Network for more information!
Causes and Solutions for Yellowing Leaves on Flowering Plants
Yellowing leaves on flowering plants are the most common problem we encounter when growing flowers. A perfectly good pot of flowers slowly turns yellow and withers, and we do not know the reason. In fact, there are many reasons for leaves turning yellow and falling off. Some are natural phenomena of the plant itself, and the leaves can simply be cut off once they have completed their mission. But some plants develop yellowing leaves during their normal growth cycle, and this should attract our attention, and we should carefully investigate the cause and treat it accordingly.Causes of Yellowing Leaves and Solutions
(1) Overwatering: the potting soil stays too wet for a long time, causing a lack of oxygen in the soil, rotting some fibrous roots, hindering normal respiration and the absorption of water and nutrients, and causing leaves to turn yellow and fall off. After being affected, the young leaves first turn pale yellow, and then the old leaves gradually turn yellow as well. Watering should be controlled immediately, fertilization suspended, and the soil often loosened to give it good aeration.
(2) Drought and dehydration. Missing watering when growing flowers, or watering only halfway for a long time (that is, wet on top and dry below), affects nutrient absorption and also easily causes the leaves to become dull and lusterless and to wilt and droop. First the lower old leaves age, then gradually turn yellow and fall off from bottom to top. At this point, water lightly and spray water to help them gradually recover, then return to normal watering.
(3) Long-term lack of fertilizer. If no nitrogen fertilizer has been applied for a long time or the pot and soil have not been changed, the soil lacks nitrogen and other nutrient elements, causing the branches and leaves to become thin and weak and the leaves to be thin and yellow. The pot should be repotted in time, replaced with new loose and fertile potting soil, and gradually given more dilute decomposed liquid fertilizer or compound flower fertilizer.
(4) Excessive fertilization. Too much fertilizer causes new leaves to be thick and fleshy, and mostly uneven, while old leaves dry at the tips, scorch yellow, and fall off. Fertilization should be stopped immediately, watering increased so the fertilizer flows out through the drainage holes at the bottom of the pot, or the plant should be repotted immediately, the root ball rinsed with water, and then replanted in the pot.
(5) Hot, high temperatures. In summer, if flowers that prefer cool conditions (such as cyclamen, fuchsia, and wax begonia) are placed in a hot location and exposed to direct strong sunlight, it easily causes the tips and edges of young leaves to scorch, or the leaves to turn yellow and fall off. They should be moved promptly to a well-ventilated, shady place.
(6) Excessive shade. If sun-loving flowers are kept in a shaded place or a place with insufficient light for a long time, the branches and leaves will become leggy, the leaves thin and yellow, and they will not bloom or bloom very little. Take care to move the pot to a sunny place.
(7) Soil and water on the alkaline side. In most areas of the north, the soil and water contain relatively more salt and alkali. When planting acid-loving flowers such as rhododendron, camellia, banana shrub, gardenia, orchid, white magnolia, and osmanthus, because the soil lacks absorbable soluble iron and other elements, the leaves gradually turn yellow. When planting, choose acidic soil and regularly water with alum fertilizer water during the growing period.
(8) Too dense and poorly ventilated. If too much nitrogen fertilizer is applied, the branches and leaves grow too luxuriantly, and combined with a long period without pruning, the inner branches and leaves receive insufficient light, which easily causes leaves to turn yellow and fall off. Fertilize reasonably and strengthen pruning to allow ventilation and light penetration.
(9) Dry air. When indoor air is too dry, some flowers that prefer a humid environment, such as spider plant and orchid, often show dry leaf tips or scorched leaf edges. Take measures such as spraying water and covering with plastic film to increase air humidity.
(10) Improper temperature. If the indoor temperature in winter is too low, flowers that prefer high temperatures are often susceptible to cold damage, causing leaves to turn yellow and, in severe cases, to wither and die. If the indoor temperature is too high, the plant's transpiration is excessive, and the roots cannot supply enough water and nutrients, which also makes leaves turn yellow. Please remember to adjust the room temperature in time.
(11) Soil on the acidic side. Red soil in the south is acidic, and magnesium and other elements are easily lost. When planting trees and flowers that tolerate alkali or prefer slightly alkaline soil, such as oleander, boxwood, and winter jasmine, the old leaves often show yellowing between the veins. You can apply calcium magnesium phosphate fertilizer or spray a magnesium sulfate solution.
Through the detailed introduction in this article, we hope everyone can gain something from it! Welcome to continue following Zuihua Network to learn more of the latest information about home gardening!