What causes yellow leaves on orchids?
What causes yellow leaves on orchids? Here is an introduction and solutions. The main factors that cause yellow leaves on orchids are as follows for your reference: Yellow leaves caused by over-fertilization: When too much fertilizer is applied, especially too much nitrogen fertilizer combined with a lack of phosphorus and potassium fertilizer, the leaves are prone to turning yellow, showing as new leaves that are thick and fleshy with a large leaf surface...
What causes yellow leaves on orchids? Here is an introduction and solutionsThe main factors that cause yellow leaves on orchids are as follows for your reference:
Yellow leaves caused by over-fertilization:
When too much fertilizer is applied, especially too much nitrogen fertilizer combined with a lack of phosphorus and potassium fertilizer, the leaves are prone to turning yellow, showing as new leaves that are thick and fleshy, with most of the leaf surface uneven, while old leaves gradually turn yellow and drop off; in severe cases the leaf tips dry up, and even the entire leaf becomes scorched yellow. When this happens, stop fertilizing immediately, increase the amount of watering so that the fertilizer flows out through the drainage holes, or immediately repot, remove part of the old soil, rinse the root ball with water, replace part of it with fresh potting soil, and replant the plant back into the pot.
Yellow leaves caused by lack of fertilizer:
When fertilizer is insufficient, especially when nitrogen fertilizer has not been applied for a long time or the potting soil has not been changed, the soil lacks nitrogen nutrition, causing the branches and leaves to become weak and thin, with thin, yellow leaves. It is necessary to repot in time, take the plant out, move it into a pot one size larger, fill it with fresh loose and fertile potting soil, and replant it properly. After watering thoroughly, place it in a semi-shaded spot to recover. Once it resumes growth, apply a dilute liquid fertilizer or compound chemical fertilizer.
Yellow leaves caused by excessive salt and alkali in the soil:
When growing acid-loving flowers in the north, such as camellias, orchids, banana shrubs, gardenias and osmanthus, because the soil in most northern regions contains more salt and alkali, after being cultivated for a period of time the above flowers and trees will gradually lose their green color and turn yellow due to a lack of soluble iron that the flowers can absorb. At this time, you can water with 0.2% ferrous sulfate solution at intervals, and alternately water with 0.1% potassium dihydrogen phosphate solution, so that the "alkali-induced yellowing" is cured. At the same time, potassium dihydrogen phosphate also contains phosphorus and potassium, which is beneficial for flower bud differentiation and improving flower quality.
Yellow leaves caused by soil that is too acidic:
In southern China the soil is red earth, and the soil is acidic or slightly acidic. Magnesium in the soil is easily lost, and due to magnesium deficiency the leaves often show yellowing first on the old leaves and between the veins. You can apply calcium magnesium phosphate fertilizer or spray a 0.1% to 0.3% magnesium sulfate solution. For improving acidic soil, attention should be paid to applying more decomposed organic fertilizer and applying lime. Applying a small amount of lime can not only neutralize soil acidity, but also promote the decomposition of organic fertilizer.
Click to get more orchid growing techniques
Click to get more flower growing techniques