Why are the Leaves on my Monstera Obliqua Turning Yellow?

Yellowing leaves on your Monstera Obliqua can be a real head-scratcher, especially if you're new to plant care or even a seasoned plant parent. If you’ve noticed those vibrant green leaves turning yellow, you’re probably wondering, "What am I doing wrong?" Don’t worry, you’re not alone, and there are solutions to help you get your plant back to its former glory.

In this article, we’ll explore the common reasons behind yellowing leaves in Monstera Obliqua and provide you with practical tips on how to address each issue. From watering habits to environmental factors, we’ll cover various aspects to help you troubleshoot and revive your plant.

Overwatering: A Common Culprit

Let’s start with one of the most frequent causes of yellowing leaves: overwatering. Many plant lovers, in their eagerness to nurture, tend to give their Monstera Obliqua more water than it actually needs. This can lead to waterlogged soil, which suffocates the roots by depriving them of oxygen. As a result, the leaves can start to turn yellow.

Here’s a simple way to tell if overwatering is the issue:

• Check the soil moisture. Stick your finger about an inch into the soil. If it feels consistently wet, you might be watering too much.
• Look for signs of root rot, such as a foul smell or mushy roots if you decide to check the roots.

To fix this, allow the soil to dry out before watering again. You might also consider repotting the plant with fresh, well-draining soil. Adding perlite or orchid bark can improve drainage, making it harder to accidentally overwater.

Underwatering: The Other Side of the Coin

On the flip side, underwatering can also cause yellow leaves. While Monstera Obliqua can survive short periods of dryness, prolonged lack of water stresses the plant, which can result in yellowing leaves.

Signs of underwatering include:

• Dry, crumbly soil.
• Leaves that are yellowing but also feel dry or crispy.

If you suspect underwatering, give your plant a nice drink. Water thoroughly until you see it draining out of the bottom of the pot. Moving forward, aim for a consistent watering schedule that keeps the soil evenly moist but not soggy.

Lighting Issues: Too Much or Too Little

Monstera Obliqua thrives in bright, indirect light. However, placing it in direct sunlight can scorch the leaves, leading to yellowing. Conversely, too little light can hinder photosynthesis, causing the plant to lose its vibrant color.

Here’s how to find the right spot for your Monstera:

• Place it near a window where it can get bright, indirect light.
• Consider using sheer curtains to diffuse harsh sunlight.
• If your home lacks natural light, a grow light can be a good investment.

Remember, lighting is a balancing act. Monitor your plant and adjust its location if you notice any changes in leaf color.

Nutrient Deficiency: Feeding Your Plant Right

Sometimes, yellow leaves are a sign that your Monstera Obliqua isn’t getting the nutrients it needs. This is especially true if the yellowing starts from the older, lower leaves and works its way up.

The usual suspects in nutrient deficiencies include:

• Nitrogen - Essential for leaf growth and color.
• Potassium - Helps with overall plant vigor.
• Magnesium - Deficiency often leads to yellowing between the veins of the leaves.

To remedy this, use a balanced, water-soluble fertilizer during the growing season (spring and summer). Always follow the instructions on the label to avoid over-fertilization, which can also cause problems.

Temperature and Humidity: Keeping It Cozy

Monstera Obliqua hails from tropical climates, so it thrives in warm, humid conditions. Drastic temperature changes or low humidity can stress the plant, leading to yellowing leaves.

Here’s how to create a comfortable environment:

• Keep the temperature between 65°F and 85°F (18°C to 29°C).
• Avoid placing your plant near drafts, heaters, or air conditioners.
• Increase humidity with a humidifier, pebble tray, or by misting the leaves.

If you live in a dry climate, investing in a small humidifier can make a world of difference for your Monstera.

Pests: Tiny Invaders

Sometimes, yellowing leaves can be attributed to pests such as spider mites, mealybugs, or scale. These tiny invaders can suck the sap from your plant, leading to discolored leaves.

Check for pests by examining the undersides of the leaves and the stems. You might notice:

• Webbing or tiny spots on leaves.
• Sticky residue or a cotton-like substance from mealybugs.

To tackle pests, you can:

• Wipe leaves with a damp cloth to remove visible pests.
• Use insecticidal soap or neem oil as a natural insecticide.
• Isolate the affected plant to prevent spreading to others.

Regularly checking your plants for pests can help catch infestations early before they become a bigger issue.

Root Health: The Foundation of Plant Well-Being

Healthy roots are vital for a thriving plant, and any issues below the soil can manifest as yellow leaves above. Problems like compacted soil or poor drainage can affect root health.

Consider these tips to ensure happy roots:

• Repot your plant every couple of years with fresh soil.
• Choose a pot with drainage holes.
• Use a well-aerated potting mix to allow roots to breathe.

If you’re repotting and notice dark, mushy roots, these are signs of root rot. Trim the affected roots with sterilized scissors and repot your plant to give it a fresh start.

Age: A Natural Process

Believe it or not, sometimes leaves turn yellow simply because they’re old. Just like any living thing, leaves have a lifecycle, and older leaves naturally yellow and fall off as part of the plant's growth cycle.

If only a few lower leaves are yellowing and falling off, and the rest of the plant looks healthy, there’s likely no cause for concern. It’s just the plant’s way of directing energy to new growth.

By regularly pruning these older leaves, you can encourage your Monstera to focus on producing new, healthy foliage.

Water Quality: What’s in Your Water?

The quality of the water you’re using can also affect your plant. Tap water, often containing chlorine, fluoride, and other chemicals, can sometimes cause yellowing leaves, particularly if your Monstera is sensitive to these additives.

Consider these alternatives:

• Use distilled or rainwater for your plants.
• Let tap water sit out overnight to allow some chemicals to evaporate.
• Install a water filter to reduce impurities.

While water quality issues are less common, they’re worth considering if you’ve ruled out other factors.

Final Thoughts

Yellow leaves on a Monstera Obliqua can be caused by various factors, from overwatering to pests and everything in between. By taking the time to assess and adjust your plant care routine, you can help your Monstera thrive once again.

At Cafe Planta, we’re here to support your plant journey. Whether you’re looking for a new houseplant, plant care accessories, or simply have questions, feel free to reach out. You can email us, or connect with us on Instagram. We believe plants have the power to bring people together, and we’re excited to help you create a thriving plant collection in your home.