Mandevilla Leaves Turning Yellow: Causes & Fixes

Mandevilla is one of the traditional tropical plants that gardeners in temperate climates can grow, along with hibiscus. You can treat them as an annual and simply enjoy them on your patio or balcony for the summer, or you can overwinter them indoors.

Hoever, you should be quite careful where and how you move them, because as any plant, Mandevillas also require to be taken care off, and if you don’t deliver their needs, they start to express their unhappiness by turning their leaves yellow.

Mandevilla -What Does It Represent?

Mandevilla is a genus of flowering vines that thrives in tropical and subtropical conditions and is also referred to as rocktrumpet. The gorgeous, fragrant five-petal blossoms normally come in pink, red, and white hues, although they can also have yellow throats on occasion.

Even though they can bloom well into the fall in warm climates, they typically blossom in the summer. Within the genus, some species have more, smaller blooms, while others have fewer, larger blooms. Typically, their foliage is shiny green.

Mandevilla plants can be grown as perennials in their USDA growth zones, but gardeners outside of those zones frequently prefer to grow them as annuals, especially in pots. Once the temperature is consistently warm and the risk of frost has passed, these fast-growing vines should be planted in the middle to late spring.

If you give mandevilla plants the proper growing circumstances, they are rather straightforward to care for. Plan to water your vine anytime the soil starts to dry up and to feed your plant throughout the growing season because vines thrive in lots of light, warmth, and moisture.

Pinch back the stems in the early spring to encourage these vines to grow more bushily. It’s a good idea to give them a trellis or other structure they can climb around if you let them organically develop as vines. The vines look fantastic in hanging baskets as well.

Mandevilla Leaves Turning Yellow – What Might Be The Cause?

Poor Drainage

Are you giving adequate drainage and watering to your Mandevilla plant? Chlorosis can also be brought on by too much or too little water for plants, including Mandevilla.

Overwatering drowns plant roots and hinders efficient nutrient uptake. Additionally, the plant cannot receive nutrients when there is a lack of water. To avoid yellowing leaves and plant death, balanced, well-draining soil is also necessary, as are sensible watering practices.

Mandevilla needs a little bit of moisture. Regularly inspect the soil’s surface. It’s time to water when the top inch of soil is dry.

Pest Attacks

On a mandevilla, insects may cause yellow leaves. Plants can become weakened by mealybugs, spider mites, and aphids, which are sometimes the cause of yellow mandevilla leaves. Small areas of what looks like white cotton will be seen if mealybugs have settled on the plant.

Hundreds of mealybug eggs may hatch from these and feed on the plant. No matter the pest, mandevilla’s yellow leaves can be efficiently treated with an insecticidal soap spray or a horticultural oil like neem oil.

Yellow leaves on mandevilla may need to be treated with a systemic insecticide in case of large infestations. Segregate the mandevilla from other plants until you figure out what is making its leaves turn yellow to prevent insects or disease from spreading to healthy plants. After identifying the issue, you can start treating yellow mandevilla leaves.

Disease Issues

Mandevilla disease infections, such as Ralstonia solancearum, the bacterial pathogen that causes Southern wilt, can occasionally be the cause of yellow mandevilla leaves. When temperatures are cool, plants may be healthy, and when they become warm, infections may be to blame for the yellowing of Mandevilla leaves.

Southern wilt causes plants to finally perish. To prevent the disease from spreading, every bit of plant matter, soil, and containers should be thrown away.

Natural Age

Older mandevilla plants may likely have some yellowing leaves as they wither and fall off to create place for new growth. You can take out a couple of a mandevilla’s yellow leaves.

When removing the yellowing leaves, pay great attention to the rest of the plant, especially where insects are common and that is on the underside of the leaves and in the axils of the leaves and stems.

Mandevilla Leaves Turning Yellow – Preventive Measures

Testing Soil pH level

The pH of the soil can be measured. Mandevilla can withstand pH values between 6.6 and 7.8 but prefers a neutral pH level of around 7.0. Iron is less accessible to plants in soil that has a pH greater than 6.7.

Iron may also become less available to plants in the soil if there are too many other nutrients present.


The evolution of the yellowing gives you a hint as to what’s missing if your Mandevilla has chlorosis because to a nutritional shortage. The yellowing will start on younger leaves and spread to older ones if your plant is iron deficient. The opposite is true if it is zinc, manganese, or nitrogen deficient.

Proper Watering

The soil should be kept wet but not drenched. If the roots are wet, take the plant out of its container and scoop off as much of the wet dirt as you can. Repot in fresh, dripping-dry soil.

Closing Words

The absence of the chlorophyll pigment is the reason why leaves turn yellow. This issue in Mandevilla has a number of causes, including: Lack of Nutrition, Lack of Drainage, Root Compaction and Root Damage, High pH Values, Infestation of pests. Keep those factors under your control and your plant should be in a perfect shape.

Further Reading

Homework is here! You know that you can continue reading a few more articles related to plants, flowers and gardening and I’m here to suggest you some articles, such as the one about devil’s ivy leaves turning yellow.

Furthermore, you can read about frangipani’s leaves turning yellow and how can you deal with it, and also you can give a read to the article about the Christmas cactus leaves turning red, if you feel like you are in a festive mood.

Ella Holmes

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