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According to the Sunset Garden Book "Scorched or yellowed aread on the center of leaves are usually due to sunburn. Burned leaf edges, excessive leaf drop or corky spots usually indicate over fertilizing Yellow leaves with green veins are a sign of chlorosis. Check drainage, leach, treat with iron or iron chelates. " ----------------- CW: Without a description of the distribution of the yellow on the leaves, it becomes tricky to name the cause. If you can take a picture, upload it, and post a url, it will be easier to ID the cause. Considerations include: 1) Overexposure to sun; 2) Chlorosis; 3) Camellia leaf yellow mottle virus. There's a kind of "answer tree" to go through. Is the yellowing new (i.e., have you seen it before, and under what circumstances)? If it's new, on an established plant that did not have yellowing before, it logically will be sunburn only if something has changed in its environment so that now it receives more bright sun (and heat) than it did before. Usually the yellowing will be accompanied by bronzing of the leaves, as well, if it's sunburn..but chlorosis can show bronze leaves too. It depends on the distribution of the bronzing. If that is the case, then your options are: 1) Move the plant to where it is shaded like it was before; 2) Build a lattice or other structure to provide the shade it had before without moving the plant, or; 3) Live with the yellowing. The latter choice is not so good because a camellia can get stressed enough so that it can become susceptible to diseases. Ultimate worst-case scenario: it dies, after you've worked your heart out trying to make it live. If the yellowing is not new, and the shade situation has not changed, then it may be chlorosis, but it depends on what the yellowing looks like. You didn't say what region of the country you live in. Some soils naturally have less available iron. If it is chlorosis (interveinal yellowing), then there can be a few causes: 1) Soil that doesn't have a lot of available iron natively and supplemental iron hasn't been applied in awhile; 2) Soil pH out of whack (usually pH is too high); 3) Saturated soils. If you are watering too much, the iron in the soil is turned into a form that can't be accessed by plants. As soon as the soil dries out, it will become available again. If you don't have one, buy a hand-held soil-moisture meter (don't get the digital ones, they are a waste of money and the first time you drop it in a bucket or on the ground, it's kaput). Take four readings from around the plant. Push the probe down at least 5". It should not read more than mid-midrange (they usually have three zones: dry, moist, wet, but they call them different names on different meters. So I'm talking about the mid-zone, mid-way). If it is too wet, back off on the watering. DON'T ADD EXTRA IRON UNTIL YOU MAKE SURE IT ISN'T BECAUSE OF SATURATED SOIL. If your soil isn't saturated, then it could be pH. Camellias like soil in the more acidic range---but don't go crazy dropping the pH because too low of a pH can also interfere with iron uptake. You can contact a soil lab that does homeowners' soil testing, and make arrangements to send soil to them for testing. That is the #1 sure way to find out what the deal is. You can buy a kit from a home-gardening store that tests pH and give it your best shot. Some kits are more accurate than others. You can think back to the last time hydrangeas bloomed, and if the majority of them were blue, you live in acidic soil, so the pH isn't the issue. If it's chlorosis and it's not due to saturated soils or high pH, then the third possible cause may be the culprit: camellia leaf yellow mottled virus. If you're lucky, it will look like mine does, which is something like this: http:/www.rhs.org.uk/Advice/camellias/camellia_images/yellow_mottle.jpg I love the variegation, and if my camellias didn't have it, I'd try to inoculate it. The mottling can become overwhelming, however, so that most of the leaf is yellow, and if that is the case, those leaves aren't making energy for the plant because all of the chlorophyll is gone from the leaf. If it is chlorosis, and it's not because the soil is too saturated, it may be iron deficiency (if you get a soil lab test, you will know for sure, but most people want to go through the hassle). If you add iron to the soil, use a naturally long-term (slow-release) type, such as blood meal. Because it's not just straight iron, and is part of dried blood, it is somewhat buffered from being made inactive by oversaturated soil. I hope this helped and didn't overwhelm you. If you post a picture of the chlorosis, I can probably be more specific in the answer.
What else can I help you with?
Why is your pieris leaves turning brown?
Pieris leaves may be turning brown due to overwatering, underwatering, or exposure to harsh sunlight or extreme temperatures. It could also be a sign of an underlying fungal or bacterial infection, so ensure the plant is in well-draining soil and receives appropriate sunlight and water to help it recover.
What is is called when Lily of the valley leaves have brown spots and then turn brown and die?
The condition is likely due to a fungal disease called leaf spot. It causes brown spots on the leaves, which can eventually lead to them turning completely brown and dying. Proper sanitation and providing good air circulation can help prevent the spread of the disease.
Why are the leaves on alocasia turning brown?
Brown leaves on an Alocasia plant could be due to overwatering, underwatering, low humidity, or exposure to direct sunlight. Check the soil moisture, ensure the plant is not in a drafty area, increase humidity around the plant, and move it to a spot with indirect sunlight to help prevent further browning of the leaves.
Why do plants go brown?
The leaves of plants may go brown because of a number of reasons. Some plants' leaves go brown due to lack of enough water while others do so as a natural process when they are about to shed their leaves.
Why rhodrendrum leaves turning brown?
Rhododendrum leaves can turn brown due to various reasons such as excessive sunlight exposure, improper watering (either too much or too little), nutrient deficiency, pests or diseases. Make sure to check the plant's environment, watering schedule, and inspect the leaves for any signs of pests or diseases to address the issue.
Why are my dracaena plant's leaves turning brown and crispy, resembling burnt leaves?
The dracaena plant's leaves may be turning brown and crispy due to overexposure to direct sunlight, underwatering, or low humidity levels.
Why is your inside palm plant leaves turning brown?
if it its leafs are turning brown then that probably means that it is sick or is not getting enough light.
How do you care for the leaves on a Robellini palm tree turning brown?
You can't.
Why are the palm tree's leaves turning brown?
The palm tree's leaves are turning brown due to lack of water, nutrient deficiency, pests, diseases, or environmental stressors like extreme temperatures or sunlight exposure.
Why are my brown orchid leaves turning brown?
Brown orchid leaves turning brown could be due to a variety of reasons, such as overwatering, underwatering, inadequate light, or pest infestations. It is important to assess the care conditions of your orchid and make adjustments accordingly to promote healthy leaf growth.
Why are my mass cane leaves turning brown?
Mass cane leaves may be turning brown due to overwatering, underwatering, low humidity, or exposure to direct sunlight. It is important to ensure the plant is receiving the right amount of water, humidity, and light to prevent browning of the leaves.
Why are my weigela leaves turning brown?
The most common reasons for weigela leaves turning brown are overwatering, underwatering, or exposure to extreme temperatures. Check the soil moisture, adjust watering as needed, and ensure the plant is in a suitable environment to help prevent further browning of the leaves.
Why are the leaves on my orchid turning brown?
The leaves on your orchid may be turning brown due to overwatering, insufficient light, or low humidity levels. Make sure to water your orchid properly, provide adequate light, and maintain a humid environment to prevent further browning of the leaves.
The leaves on your eucalyptus tree are turning brown What do you need to do?
Does the tree need more watering?
Why are the leaves of my avocado plant in water turning brown?
The leaves of your avocado plant in water may be turning brown due to root rot caused by overwatering. This can lead to a lack of oxygen in the roots, causing them to decay and the leaves to turn brown. It is important to ensure proper drainage and not let the plant sit in water for too long.
Why are my orchid's leaves turning brown?
Your orchid's leaves may be turning brown due to overwatering, insufficient light, or low humidity levels. It's important to ensure proper watering, adequate light, and humidity to keep your orchid healthy.
Why are the gardenia's leaves turning brown?
The gardenia's leaves may be turning brown due to overwatering, underwatering, insufficient sunlight, or a nutrient deficiency. It is important to check the plant's watering schedule, sunlight exposure, and soil nutrients to address the issue.
