Does the Mandevilla have yellow leaves? This can have several causes. In this blog we explain the most prominent causes of yellow leaves and solutions are discussed. The following subjects take the order of the most likely cause to the least likely cause.
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1. Excessive use of fluid
Does your Mandeville show lower yellow leaves, are they turning brown or are they falling out? Then your plant has probably received too much water. To check this, you can pull the plant out of the pot and look at the roots. If they are brown, an excessive amount of water is indeed the cause of the yellow leaves.
Solution:See if the excessive water can easily leave the pot. Does the pot have holes in the bottom? It is better not to place a saucer under the pot, as the water can not be drained off. The Mandevilla does not like having wet feet. Another solution is to scatter a layer of hydro granules in the pot. This way, the roots are not in direct contact with the water.
2. Deprivation of sunlight
Does the Mandevilla show yellow leaves at the heart of the plant? This means it is likely to be due to a lack of sunlight. As not enough sunlight reached the middle of the plant, the plant does not longer use these leaves for photosynthesis. Also, the leaves in the middle of the plant will stay humid for a longer period of time. These are reasons why the plant would rather let the leaves go.
Moreover, this is nothing to worry about. It is sensible to remove the leaves that have fallen off. Because the sunlight does not reach this spot, moisture does not evaporate as quick which heightens the chances of the fallen leaves to grow moldy. The growing of mold could be a danger for the plant.
During autumn the sun shines less and the air becomes more humid. This results in the plant showing a bit more of a yellow colour as a whole. This starts to become visible in November, depending on the weather. If you wish to hibernate your Mandevilla, this is the moment to place the plant inside.
3. Lack of nutrition
If a few leaves at the bottom of the plant show a yellow colour, a lack of nutrition can be the cause. The yellow leaves can be removed. A solution can be to supplement the feeding with liquid plant fertilizer. This is only required when the plant is going bald due to an excessive amount of leaves falling out.
A surplus of nutrition will be saved by the plant in the roots. This is a special characteristic of the Mandevilla. A shortage of nutrition is resolved by the plant by letting go of its lower leaves. The plant will always ensure that the upper leaves can further develop. The lower leaves are filled with waste matter and will fall off; this is the plants manner to stay healthy. It is normal for the plant to have yellow leaves now and then, these can be removed.
The potting soil available at the slrfc.org contains enough nutrients for the whole season.
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4. Leaf fall as a result of disease or plague
Leaf fall as a result of plagues does not occur in nature. If the plant does come into contact with lice or whiteflies, nature will take care of this. For example, ladybugs will be attracted to the plant after several days. They eat a 100 lice each day!
Leaf fall due to disease in Mandevillas is also rare. Sometimes mold and bacteria can cause branches to die off. This can be seen when a branch turns a brown colour and withers. It is important to remove these branches as quickly as possible. This way your prevent other branches from also being infected.