Why Is Your Rubber Plant Dropping Leaves? A Guide to Care Methods and Precautions

The rubber plant has thick, sturdy small branches and broad, fleshy leaves with a glossy, leathery texture in green or dark green, making it an excellent potted foliage plant. So, why is your rubber plant dropping leaves? What care methods and precautions are there for rubber plants?

1. Why is the rubber plant dropping leaves?

1. The plant has not been repotted for a long time, causing the soil to become compacted. In the early stages of growth, the rubber plant needs repotting once a year, with the pot diameter increasing each year. After 6 to 8 years of growth, it can be repotted once every three years. If it is not repotted for a long time, the potting soil becomes severely compacted, soil aeration deteriorates, and the fibrous roots of the rubber plant suffocate and die, unable to absorb water and nutrients, causing the leaves to turn yellow and drop.

2. The plant has not been fertilized for a long time. The rubber plant likes heavy feeding and heavy watering, and going without fertilizer for a long time causes nutritional deficiency, leading to yellowing leaves.

3. The overwintering temperature is too low. The minimum temperature the rubber plant can adapt to for growth is 6 to 8 degrees. If the indoor temperature in winter falls below 5 degrees, leaves will turn yellow and drop.

4. Too much watering or fertilizing. Although the rubber plant likes water and fertilizer, if watered or fertilized too much, especially from August to September when the weather is still rather muggy, excessive watering causes water to accumulate in the pot; or if watered too much during overwintering when the plant is in its dormant period and transpiration is reduced, the water in the pot cannot drain away in time; or if raw fertilizer, heavy fertilizer, or concentrated fertilizer is applied by mistake, root rot will occur from water damage or fertilizer damage, causing the leaves to turn yellow. If the root rot is caused by fertilizer damage, the roots will be accompanied by an unpleasant odor.

5. The indoor air is too dry, and the moisture in the potting soil is not enough to supply the transpiration needs of all the leaves, causing some leaves, especially the older lower leaves, to turn yellow and even drop.

6. Poor indoor ventilation. If the room is not ventilated for a long time, a large amount of harmful gases accumulate, such as excessively high carbon dioxide concentration, which can also cause yellowing and leaf drop.

7. Prolonged shade. The rubber plant is a tropical species that likes sunlight and cannot tolerate shade. If it does not get sunlight for a long time indoors, yellowing and leaf drop will also occur.

8. It may be infected with gray mold disease.

2. Care methods and precautions for the rubber plant

1. Adjusting light. The rubber plant likes light and needs moderate to high intensity light during the growing season, but strong direct sunlight should be avoided in summer to prevent leaf scorch; in winter it should be placed near a spot indoors with plenty of light. If kept in shade for a long time, it easily causes yellowing leaves or leaf drop. In addition, the rubber plant has a rather stubborn original orientation, and once it is growing it should not be moved around casually, but if it grows too vigorously in one direction, the direction should be changed appropriately to promote balanced growth.

2. Adjusting temperature. The rubber plant prefers a high-temperature environment, with an optimum growth temperature of 25 to 30°C, but when it exceeds 35°C, it should be moved to a cool, ventilated place. In winter the indoor temperature should be kept above 10°C, otherwise the leaves will turn black and yellow and even drop. Keeping the rubber plant in a low-temperature and damp potting soil environment for a long time also easily causes root rot.

3. Watering. The rubber plant likes water, and during the growing period a sufficient water supply should be ensured, watering on schedule every day to keep the potting soil moist. In the high-temperature summer season, water once each in the morning and evening every day, and use a spray bottle to mist the leaves. Reduce the amount of watering in autumn, and in winter decide whether to water based on the soil moisture.

4. Fertilizing. The rubber plant needs a large amount of fertilizer during the growing period. In seasons around 25°C, apply a nitrogen-based compound fertilizer or decomposed dilute cake fertilizer water once a month. When young rubber plants are repotted each year, humus should be added to the potting soil and sufficient base fertilizer applied. For mature plants 4 to 8 years old, planted in wooden tubs, applying topdressing 3 to 4 times a year will keep the branches lush and the leaves abundant.

5. Preparing the growing medium. The growing medium for potted rubber plants needs to be slightly acidic, fertile, moist, and rich in humus. The growing medium is usually made by mixing peat soil, leaf mold, and river sand in equal thirds of 1/3 each, with a small amount of base fertilizer added.