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.
With their bright, sunny colors, African marigolds are a beloved addition to many gardens. However, like any plant, they can fall victim to rotting if proper care is not taken. Rotting in African marigolds is often caused by overwatering, poor drainage, or fungal diseases. Once rot takes hold, it can rapidly spread and destroy your beautiful marigolds. The key is prevention through proper cultural practices. Follow this complete guide to keep your African marigolds thriving and rot-free all season long.
Understanding What Causes Rot
Before we dive into prevention it’s important to understand what underlying factors can lead to rotting in African marigolds
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Overwatering – Excess moisture around roots promotes fungal and bacterial growth leading to rot
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Poor drainage – Waterlogged soil deprives roots of oxygen, inviting root rot pathogens.
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High humidity – Thick foliage holds moisture, creating ideal conditions for foliar fungal diseases.
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Compacted soil – Lack of aeration encourages anaerobic organisms that cause rot.
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Fungal diseases – Pathogens like botrytis, phytophthora, and pythium directly instigate rot.
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Bacterial diseases – Bacteria such as pseudomonas and xanthomonas can also lead to bacterial soft rots.
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Prolonged wet foliage – Dripping irrigation and rain spreads spores leading to foliar rots.
By understanding the conditions that favor rot development, we can take steps to prevent it.
Provide Well-Draining Soil
The most fundamental way to avoid rot in African marigolds is to plant them in light, sandy, fast-draining soil. Heavy clay soils that retain moisture must be amended thoroughly with compost or other organic material to improve drainage before planting.
Raised garden beds can also promote drainage and prevent waterlogged conditions at the roots. Ensure any containers have adequate drainage holes. Monitor soil moisture levels routinely and let the top few inches dry out before watering again.
Improve Air Circulation
Dense, overcrowded plantings impede airflow, creating the humid conditions conducive to fungal and bacterial rots. Space marigolds properly to allow ample air circulation through and around the plants. For potted plants, avoid overfilling containers and space them out.
Remove any diseased foliage immediately to open up airflow. Trimming overgrown or crossing branches also improves ventilation.
Water Carefully at Soil Level
Exercise caution when watering to keep moisture off the foliage. Drip irrigation, soaker hoses, or watering wands targeted at the base of plants are ideal. Avoid frequent overhead watering that wets leaves and flowers, making them prone to foliar diseases.
Water thoroughly only when the top few inches of soil become dry. This encourages deep root growth for drought tolerance. Mulching around plants helps retain soil moisture so watering is less frequent.
Apply Preventative Fungicides
At the first sign of disease or as a proactive measure, apply fungicides specifically targeted at common marigold rots such as those caused by Botrytis, Phytophthora, Pythium, and powdery mildews. Always follow label instructions carefully. Replace mulch around plants to cover any fungicide drenched soil.
Ensure Proper Spacing
A common mistake is planting marigolds too densely. Overcrowding prevents air movement and directs growth upward as plants compete for light. Space them 12-18 inches apart depending on variety to allow air circulation. Remove weaker, leggy specimens and thin inner branches to open up the plant center.
Sanitize Tools and Remove Debris
Disinfect all pruning tools before each use with diluted bleach solution to avoid transmitting diseases through wounds. Remove fallen leaves, flowers, and dead branches around plants promptly to eliminate inoculum that could spread rot.
Scout for Signs of Disease
Check African marigolds frequently for early symptoms of fungal or bacterial rots. Look for spots on leaves or flowers, sudden wilting of foliage or branches, soft or mushy areas, or a foul odor. Remove and destroy any diseased plant material immediately before it spreads.
Avoid Excess Nitrogen
While fertilization is beneficial, avoid overuse of high nitrogen fertilizers which encourage lush, susceptible growth. Focus on balanced organic feeds applied at recommended rates to nourish plants without pushing excessive foliage.
Control Insect Pests
Insects can spread spores and bacteria around while feeding. Monitor for pests like aphids, thrips, or whiteflies and use recommended treatments if populations exceed thresholds. Sticky traps help detect and capture insect pests.
By proactively managing these key factors, you can have a thriving crop of vigorous, rot-resistant African marigolds this season. A well-draining planting site, prudent watering, preventative fungicides, proper spacing, sanitation, disease monitoring, controlled fertilization, and pest management are the secrets to success. Follow this comprehensive guide and your marigolds will reward you with a spectacular bounty of bright, beautiful blooms all season long.
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.
How to Control Pests & Disease for Marigolds : Grow Guru
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