Common Diseases Of Calendula – How To Treat Sick Calendula Plants

Common Diseases Of Calendula – How To Treat Sick Calendula Plants

By: Amy Grant

Calendula is a genus in the daisy family Asteracea that has been used both in cooking and medicinally for centuries. Useful to treat a variety of medical ailments calendula may be, but that doesn’t mean calendula doesn’t get its own share of plant diseases. How do you treat sick calendula plants? Read on to learn about diseases of calendula and managing diseased calendula plants.

Calendula Plant Diseases

Calendula is an herbaceous plant native to southwestern Asia, Western Europe, Micronesia, and the Mediterranean. Easy to grow, the pretty golden petals have been used for hundreds of years in cooking, hence its nickname “pot marigold.” Calendula is also used to dye fabrics and, as mentioned, to treat a multitude of health problems.

  • A namesake disease of calendula, calendula smut, is a fungal leaf disease that results in round green/yellow to brownish/black lesions. These spots may have dark brown borders as well. The lesions appear thick and can be viewed on both the back and front of the foliage.
  • Aster yellows is caused by phytoplasma rather than a fungus or bacterium and is spread by leafhoppers. Sick calendula plants become stunted, develop witches’ broom, and the flower petals turn green and twisted.
  • Powdery mildew is another fungal disease that is most prevalent during warm, humid weather. Foliage may curl and has a white to grayish coating.
  • Several pathogens cause root rot in calendula plants. Seedlings as well as mature roots may be afflicted.
  • Rust is the result of a number of fungus diseases. As the name suggests, rust colored spots appear on foliage and stalks.

How to Treat Sick Calendula Plants

To combat diseases in calendula, practice good sanitation, allow sufficient space between plants and apply fungicides. Crop rotation is also an important part of managing diseased calendulas.

Also, be sure that the soil has excellent drainage. Remove and discard infected plants to slow the spread of the disease and water at the base of the plants.

In the case of aster yellows, keep the area around the plants weed free where leafhoppers find habitat and take steps to control them. Also, remove infected plants.

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Read more about Calendula

Other names of Calendula are Marie Gold, marigold, Calendula officinalis, gold flower, marigold Rose.

Calendula officinalis is an annual herbaceous plant that can be seen in the small gardens, flower beds, front gardens etc.. The marigold is grown as a valuable medicinal plant in the special farms.

The homeland of this plant is Central and Southern Europe. The characteristic feature of the marigold is its intense and specific smell.

There is also a Calendula ornamental plant that has puffy bright yellow flowers. They are very nice but do not confuse it with the medicinal plants, because they have different properties.

Calendula flowers are golden yellow or orange, and they are quite large.

The Calendula blooms from June to October. They even survive the cold snap to 9 degrees below zero. The gold flowers decorate the garden and they are good honey plants. The marigolds honey is characterized by the high healing properties.

The rich chemical composition gives the plant a special meaning. The leaves of Calendula contain many vitamins C and organic acids, including salicylic acid (aspirin), and the flowers contain carotene, phytohormones, phytoncides (essential oils), ferments, tars, mucous, dyes, tanning and bitters.

The fresh young leaves of marigold in the rosette stage are used as a salad or an addition to other salads, meat and fish dishes, soups and pies, evaporated vegetable dishes.

Marigolds have a relaxing effect on the central nervous system, reduce the excitability and the arterial blood pressure, control the cardiac function in the cardiac arrhythmia.

Marigold is used in menopause and is also used as a symptomatic agent in inoperable cancer types. Under the effect of marigold in cancer patients, the intoxication decreases, the dyspeptic symptoms disappear, the sleep and appetite improve. The effect of Calendula for acne is similar to the strong antibiotic, especially as regards the staphylococcus and streptococcus.

Calendula for acne is used both in the primary, as well as in traditional medicine. In homeopathy marigold tincture and ointment are made from flowers. In the skin diseases, it is recommended to use the Calendula for psoriasis internally and externally.

As an anti-toxic agent, Calendula psoriasis is applied for itching,allergic dermatitis.

Psoriasis is a non-infectious disease that manifests itself in red very dry patches on the skin. To alleviate the symptoms, it is recommended to apply Calendula for psoriasis. PsoEasy psoriasis cream includes Calendula psoriasis extract that helps well the affected skin.

Ground preparation

Garden beds or containers filled with organic compost (potting mix). To improve the soil, mix good fertilizers in the first soil of beds.

  • Herbaceous flowering plants’ length is 2 feet. Flowers bloom in the sun and dry weather and cold and damp conditions they are closed. It blooms well in warm areas, although they also tolerate partial shade, where the atmosphere is warm. This plant needs moderate water.
  • The plant is self-seeds in the garden and they automatically grow.
  • If it is growing by seed in early spring or late fall, you can directly sow on the ground.
  • These plants prefer full sun but will tolerate light shade in the warm area.
  • Sow the seeds of calendula 4 to 6 weeks before the last frost, it takes about 5 to 15 days to germinate. Water and liquid fertilizer should be used regularly during the growing season, this enhances blooming ability.
  • Pinch off flowers on a regular basis it should extend the blooming period. To prevent weeds, conserve moisture and keep the roots cool, use mulch.
  • Spacing –24 to 36 inches apart in all directions.


Calendula is one plant that looks good in the garden and great in a salad today on Southern Gardening.

Calendula is called pot marigold and has daisy-like flowers that range in diameter from two to four inches. There are single, double, and semi-double forms. Colors range from bright yellows and oranges, to subdued colors of apricots and cream. The petals are fantastic when mixed in with baby salad greens. The vivid colors can wake up any everyday salad. Calendula will grow up to 30 inches tall and wide. This is a good plant to attract butterflies so plant with food sources for the caterpillars like fennel or butterfly weed.

Calendula is a good choice for a combination container. Try calendula and nasturtium for a feast for the eyes and the dinner table. Direct sow the calendula and nasturtium in a good potting mix. Add pansy or viola for a splash of color while the nasturtium and calendula develop.

In the landscape plant in either full sun or partial shade in amended well drained soil. Once flowering they will continue until frost in the fall. By midsummer the plants may look tired so prune back by half and they will come back strong for the autumn show. Keep the soil moisture consistent and fertilize once per month using a good water soluble formulation. Start seeds inside with your tomatoes and peppers about six weeks before the spring frost date for your area. Be sure to cover with potting media as the seeds will not germinate if exposed to light. I’m horticulturist Gary Bachman for Southern Gardening.

Watch the video: 10 Plants That Can Change Your Life: Herbal Medicines In Your Own Backyard!