Marigolds are a popular flower amongst home gardeners. They are low-maintenance, and provide beautiful blooms for long periods. Grown as an annual, Marigolds do best in warm climates and are quite tough. Although they are quite tough and able to withstand numerous conditions, they aren’t immune to some common plant issues.
Things that are out of our control such as too much rain, bug infestations, or hungry deer are a few things that can harm your marigolds. So what can you do once you see issues start to pop up?
The first step is actually identifying the problem. Once you’ve identified what’s going on with your plant, you can put a plan of action together that will help bring your marigolds back to a happy, healthy state. Let’s take a deeper look at some of the most common marigold problems, and how to fix them!
Wilted leaves can be caused by a few things. The most common reason leaves wilt is that the soil is too dry. If this occurs, increase your watering frequency. It can be tempting to keep your plants moist after seeing wilted leaves, but don’t!
Once they perk back up, simply maintain a consistent and frequent watering schedule. If you keep your plants too moist, especially marigolds that don’t like to be kept moist, you can stress your plant out further.
Plants will also show signs of wilting when they are experiencing heat stress. This usually occurs in the warmer summer months and has almost nothing to do with moisture. Heat stress occurs when the temperatures remain high and the plant cannot use the water in the soil fast enough to cool themselves off.
It can be tempting to water your plants if heat stress happens, but it is important to stick to your regular watering. Soaking heat stressed plants can deprive the root system of oxygen and will further stress your plants out.
A tell tale sign between wilting from being dry and wilting from heat stress or overwatering is the color of the foliage. A plant that is too dry will look faded in color and sometimes appear brown or crispy. A plant that is overwatering or heat-stressed will still have normal dark green foliage.
Tips of leaves begin to turn dark brown when the plant has been overwatered. It usually appears on the tips of leaves but can also affect stems. Whole leaves can begin to turn brown and get crispy, eventually falling off.
Remove the affected leaves and allow your plant to slightly dry out before watering again. Once the plant has begun to dry out, return to a consistent watering schedule. Marigolds do not like to be kept too moist, so keep this in mind when watering your plants.
As a proud grower of vibrant orange and yellow African marigolds, it can be alarming to notice your plants’ normally cheery foliage taking on a sickly yellow hue
Yellowing leaves on your prized Tagetes erecta can have several possible causes. The good news is that with a few simple fixes you can nurse your marigolds back to their glory of golden blooms atop lush green leaves.
In this article, we’ll explore the most common reasons behind yellowing leaves on African marigolds and provide tips to restore their radiance.
Overwatering
Excessive moisture is a prime culprit for marigold leaves turning yellow. These plants thrive in hot, dry conditions. Too much water can easily damage the roots, leading to stress and yellowing of the foliage.
Here are some signs of overwatering:
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Leaves start yellowing from the bottom up. Lower leaves touch wet soil and show distress first.
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Stems and leaves feel mushy or appear wilted.
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Brown soft spots or legions on leaves.
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Stunted growth.
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White fungal coating on leaves or soil.
To remedy, allow soil to fully dry out between waterings. Water early in the day at ground level without getting foliage wet. Improve drainage if needed. Remove affected leaves and stems. Resume moderate watering once soil is completely dry to avoid further rot.
While African marigolds are drought-tolerant, underwatering can also cause yellowing. But this is less common than overwatering issues.
Nutrient Deficiencies
If marigold leaves are pale greenish-yellow, the plant may be lacking key nutrients, especially nitrogen. Insufficient nitrogen causes uniform yellowing spread across old and new leaves.
Other deficient nutrients like iron, magnesium, and manganese can also pale out foliage. Have soil tested to identify needs. Apply a balanced fertilizer or specific amendments as required to nourish plants.
Cold Weather
African marigolds thrive in hot, sunny spots. If exposed to cooler temperatures, leaves can respond by turning yellow. Frost will blacken and kill foliage, signaling the end of the annual plant’s life cycle.
But longer stretches of daytime highs below 70°F can also induce leaf yellowing. Protect plants with row covers at night if cooler temps are forecasted. Move containers to warmer, sheltered areas.
Pests
Certain sucking insects like spider mites, thrips, and aphids can drain marigold leaves of chlorophyll, causing yellow speckling or stippling damage.
Caterpillars may chew holes in leaves, which then turn yellow around the wounds. Inspect undersides of leaves for culprits. Remove pests by hand or use insecticidal soap as needed.
Fungal Diseases
Several fungal diseases can turn African marigold leaves yellow, such as:
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Powdery mildew: White fungal coating on leaves
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Botrytis blight: Grey fungal growth on flowers and stems
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Leaf spot: Small lesions on leaves
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Root rot: Yellowing from soil up due to wet roots
Improve air circulation and avoid wetting foliage to prevent most fungal issues. Promptly remove and destroy any diseased plants to prevent spread.
Old Age
As marigolds reach the end of their annual life cycle in fall, yellowing of lower leaves is normal. This is simply a sign that the plant is putting its last efforts into flowering and seed production before frost causes complete dieback. No intervention is needed for this natural process.
Other Causes
Less common reasons for marigold leaf yellowing include:
- Compacted or poor quality soil preventing root growth
- Too much direct sun bleaching out leaves
- Viral infections
- Herbicide damage
Rule out more probable causes before investigating these issues. Test soil and inspect plants thoroughly.
Preventing Yellow Leaves
While some yellowing is inevitable as plants age, you can prevent or minimize leaf distress by:
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Choosing disease-resistant marigold varieties
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Providing full sun and hot, dry conditions
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Watering thoroughly but infrequently
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Amending soil with compost before planting
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Using row covers to protect from cold
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Applying balanced fertilizer monthly
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Inspecting regularly for pests
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Pruning for open air circulation
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Removing spent flowers and dead leaves promptly
When to Worry
Mild yellowing of older leaves generally isn’t a major concern. But if you notice:
- Rapid leaf yellowing, especially in young leaves
- Yellowing across whole plants
- Multiple marigolds affected
- Yellowing combined with wilting and poor growth
This indicates a more serious underlying issue that needs your prompt attention.
Don’t Despair!
While startling, yellow leaves don’t mean certain death for your treasured African marigolds. A little TLC along with remedying the underlying cause will have them flourishing again soon. Keep an eye out for early signs of trouble and take action to nurture the plants back to health. Your garden will soon be glowing with their golden radiance once again.
Floppy Stems or Leaves
The most common reason plants become floppy or lose their turgidity is from overwatering. Plants that are not allowed to dry out in between waterings can become waterlogged causing the stems to appear limp and sometimes lean or fall over.
These floppy stems can hinder the plant from taking up moisture and nutrients properly. Most plants will bounce back from this if given time to adjust. Allow your marigolds to dry out in between waterings to prevent overwatering.
Plants that are not producing flowers usually means they aren’t getting enough sunlight. Marigolds are full sun plants and will take all the sunlight they can get. If your plants are getting too much shade due to location or surrounding plants or trees, this can hinder them from flowering. If your plants are receiving too much shade, move them to a sunnier location.
If your plants are receiving a good amount of sun, but still aren’t flowering, consider deadheading the old blooms. This can promote new growth and will help the plant produce new flowers.
Young plants will not flower until they reach a certain maturity. If you transplant young plants, give them some time to adjust to their new area and mature. If planted in the right conditions, they should flower in no time!
Plant leaves turn purple for a couple of reasons. The leading cause is usually a phosphorous deficiency. Marigolds are not super needy when it comes to fertilizer or nutrients, but depending on the soil and other surrounding factors, they can require more phosphorus.
Low night temperatures can also cause leaves to turn purple. If temperatures dip below 55, your plants can react in many ways. One way is that the leaves will start to turn purple.
If you suspect phosphorus deficiency, apply a fertilizer to your plants. A low grade all purpose should do the trick if you haven’t fertilized recently or at all. If you have been fertilizing your plants, maybe switch to another fertilizer or find one that provides a good amount of phosphorus.
Leaves turning yellow can be caused by a few different things. Lack of nutrients could be one reason your marigold leaves are turning yellow. Applying a fertilizer will help the coloration go back to normal.
Leaves can also turn yellow due to a disease called Aster Yellows. Aster Yellows affect plants in the Asteraceae family, and cause stunted growth, yellow leaves, and can affect buds and blooms.
This disease is spread by insects that can be found on your plants or weeds surrounding the area. Keep the planting area weed free and keep an eye out for insects all season.
Marigolds do not like to be kept in moist conditions. Allowing your plant to dry out in between waterings can help prevent certain problems from arising such as stem and root rot.
If your plant’s stems are turning brown, this can be a sign they are rotting. Oftentimes the rot starts in the root system where too much moisture is being held and will work its way up the plant affecting the main stem first and so on.
Applying a fungicide can help stop this from destroying your plants, but if the problem has already affected a decent amount of the plant, it might be too late. Make sure you’re planting in fresh, healthy soil to help prevent this problem from occurring.
Brown Spots or Leaf Tips
Brown spots can be caused by bacterial leaf spot, or an excessive amount of iron. Marigolds do not grow well in soils that have low pH, and this can lead to iron toxicity. A soil test can help determine if you have a low soil pH.
If the spots seem more sporadically located, they are likely caused by bacterial leaf spot. Treat leaf spot with a fungicide.
Plants become leggy when they aren’t getting enough sunlight. Marigolds grow best in areas that receive full sun, as much as they can get. If your plants are in an area that is receiving too much shade or just not enough sunlight, the plant will become leggy and look stretched out as it is reaching for more light.
Be sure to rotate containerized plants to ensure they receive even sunlight. Transplant-shaded plants into a new sunnier location and they will soon adjust to normal growing patterns.
In conditions where humidity is high, or plant leaves aren’t allowed to dry out and get good airflow, Powdery Mildew can form. Powdery Mildew is a fungus that appears as a sticky white substance on the tops of leaves.
It often occurs on older growth where leaves are more bushy and close together, but can affect new growth in certain conditions. It is important to eradicate this fungus as soon as possible as it can do a number on the host plant and spread to your other plants.
There are home remedies that can help prevent the spread of Powdery Mildew, but if it is severe a fungicide application might be necessary. Copper soap or fungicides with sulfur as an ingredient seem to be the most effective.
Yellow or brown speckling on leaves is usually caused by a bug infestation. Aphids or spider mites are usually the culprits on flowering annuals such as marigolds. Aphids appear as tiny green insects on the undersides and stems of plants.
They feed on foliage, creating a brown speckled appearance. Since aphids have such an extensive life cycle, it is important to treat them accordingly so they don’t get out of hand.
Spider mites are tiny white bugs that will create small webs that look similar to normal spider webs. They create a sticky substance across the plant and will feed on foliage which will create a yellow speckling on the leaves. Spider mite infestations start small but can increase quickly. Pyrethrum sprays are a good option for eradicating spider mites.
LEAVES TURNING YELLOW ? Here are 5 tips to fix the issue
FAQ
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