Why are the Leaves on my Monstera Subpinnata Turning Yellow?

Yellow leaves on your Monstera subpinnata can be a bit of a head-scratcher, can’t they? You’ve done everything by the book, yet here they are—those unwelcome yellow signals waving at you. Don’t worry, though. You’re definitely not alone, and there's a lot you can do to nurse your plant back to health.

This article will cover common reasons why the leaves on your Monstera subpinnata might be turning yellow, along with tips and tricks to help you troubleshoot the issue. By the end, you’ll have a better understanding of what your plant needs to thrive.

Overwatering: The Usual Suspect

Let’s kick things off with one of the most common issues: overwatering. Your Monstera, like many houseplants, prefers a good balance in its watering schedule. Think of it like us humans—we wouldn’t want to be drinking water constantly all day, right?

When you overwater, the roots become waterlogged and start to drown. This can lead to root rot, which essentially suffocates the plant. Yellow leaves are often one of the first signs. So, how do you know if you’re overwatering?

• Check the soil: Use your finger to feel about an inch below the surface. If it’s still moist, hold off on watering.
• Look at the pot: Make sure it has drainage holes to allow excess water to escape.
• Observe the leaves: If they’re turning yellow and feel mushy, it might be a sign of too much water.

To fix this, allow the soil to dry out before watering again. You might even consider repotting if the soil is too compacted or if you notice a foul smell, which often indicates root rot.

Underwatering: The Other Side of the Coin

On the flip side, underwatering can also cause yellow leaves. It’s usually accompanied by crispy edges and wilting. If your Monstera looks like it’s had a rough day in the desert, it’s time to evaluate your watering habits.

Think of your plant as a thirsty friend—when they show signs of dehydration, it’s time to act. Here’s how you can help:

• Consistency: Aim for a regular watering schedule that matches the plant’s needs, usually every 1-2 weeks.
• Thorough watering: Ensure the water reaches the roots, but don’t let it sit in a saucer.
• Humidity: Monstera subpinnata loves humidity, so misting the leaves can help, especially in dry climates.

With time, you’ll get better at reading your plant’s signals, and the yellow leaves will become a thing of the past.

Lighting Issues: Too Much or Too Little?

Lighting is another critical factor that can cause those pesky yellow leaves. Monstera subpinnata prefers bright, indirect light. Think of it as the Goldilocks of lighting—not too much, not too little, but just right.

If your plant isn’t getting enough light, it can cause the leaves to yellow and drop. On the other hand, too much direct sunlight can scorch the leaves, leading to yellowing and browning.

Here’s what you can do:

• Position: Place your plant near a window where it gets plenty of filtered light, but avoid direct sun.
• Rotate: Give your plant a little spin every now and then to ensure even light distribution.
• Supplement: If natural light is sparse, consider using a grow light to give your Monstera the boost it needs.

Lighting can be tricky, but once you find the sweet spot, your plant will thank you with lush, green leaves.

Nutrient Deficiency: A Plant’s Diet Matters

Just like us, plants need a balanced diet to stay healthy. If your Monstera subpinnata is missing out on key nutrients, it might start to show through its leaves.

Common deficiencies include nitrogen, potassium, and magnesium. Here’s how to spot them:

• Nitrogen deficiency: Older leaves turn yellow first.
• Potassium deficiency: Leaf edges may become yellow and brown.
• Magnesium deficiency: Yellowing occurs between leaf veins.

To remedy this, consider using a balanced, water-soluble fertilizer during the growing season. Make sure to follow the instructions on the package to avoid over-fertilizing, which can do more harm than good.

Temperature and Humidity: The Tropical Connection

Monstera subpinnata hails from tropical regions, so it’s no surprise that it loves warmth and humidity. If your home is too cold or the air is too dry, your plant might start showing signs of stress, including yellow leaves.

Here’s how you can create a more welcoming environment:

• Temperature: Keep your plant in a spot that stays between 65-85°F (18-29°C). Avoid cold drafts from windows or doors.
• Humidity: Aim for at least 60% humidity. You might need a humidifier, especially during winter months.
• Grouping: Place your Monstera near other plants to naturally increase humidity levels.

Adjusting your home’s climate can take some trial and error, but your Monstera will thrive when it feels right at home.

Pests: Unwanted Houseguests

Pests are the unwanted houseguests that just won’t leave. If your Monstera subpinnata is suffering from yellow leaves, it might be hosting some tiny invaders like spider mites, aphids, or scale insects.

Here’s how to identify and deal with them:

• Spider mites: Look for webbing and tiny dots on the leaves.
• Aphids: Check for clusters of small, soft-bodied insects.
• Scale insects: Look for brown or black bumps on the stems and leaves.

To evict these pests, you can use insecticidal soap or neem oil. Make sure to treat the plant thoroughly, including the undersides of the leaves. Regularly checking your plant will help catch any infestations early on.

Disease: When Things Get Fungal

Diseases can also cause yellow leaves, often due to fungal infections. These can occur if your plant is overwatered or if the air circulation is poor.

Here’s how you can tackle these issues:

• Fungal infections: Look for spots or patches on the leaves.
• Prevention: Ensure good air circulation by not crowding your plants and avoiding water on the leaves.
• Treatment: Remove affected leaves and consider using a fungicide if necessary.

Preventing disease is often easier than treating it, so staying vigilant can save your Monstera from a lot of trouble.

Natural Aging: When Yellow Is Okay

Sometimes, yellow leaves are just a natural part of the plant’s lifecycle. Older leaves will occasionally yellow and drop off as new growth takes over. This isn’t something to worry about as long as it’s only happening occasionally and the rest of your plant looks healthy.

It’s kind of like your Monstera’s way of saying it’s time to move on, making room for fresh, vibrant growth.

If you notice this happening, simply remove the yellow leaves to keep your plant looking tidy. It’s all part of the natural cycle, so you can sit back and enjoy watching your plant evolve.

Stress from Repotting: Give It Time

Repotting can be a bit stressful for your plant. If you’ve recently moved your Monstera to a new pot, it might show some yellow leaves as it adjusts to its new environment.

Here’s how to ease the transition:

• Choose the right time: Spring is usually the best time for repotting when the plant is in its active growth phase.
• Be gentle: Handle the roots carefully to minimize damage.
• Patience: Give your plant some time to settle in. It should bounce back with proper care.

Repotting can be a little nerve-wracking, but it’s an important part of keeping your Monstera healthy and happy.

Final Thoughts

Yellow leaves on your Monstera subpinnata can be a sign of various issues, from watering mishaps to pest invasions. By understanding what your plant needs and adjusting your care routine, you can help it thrive again.

At Cafe Planta, we’re here to support your plant journey. Whether you’re looking for new plants, care accessories, or just some friendly advice, we're excited to help. Feel free to email us, or send us a DM on Instagram. Let’s grow together!