When to water marigold
Marigold is a very adaptable plant that does not require great care. During the very hot periods, however, it requires fairly frequent watering, able to always maintain a certain degree of humidity in the soil. Watering must never be too excessive, to prevent the stagnation of liquid from favoring the asphyxiation of the plant and the rotting of the roots. It is very important not to wet the foliage of the plant during watering, but only the soil, since excess humidity frequently determines the onset of powdery mildew, also called "white evil", a disease of fungal origin, which occurs develops both on the leaves and on the stem. With the arrival of autumn, the waterings must be reduced as the annual plants are ending their life cycle. The perennial ones, during the winter, require minimal quantities of water.
How to take care of it
Marigold is a fairly resistant and very adaptable plant, which does not require special care. It is therefore also suitable for those who do not have the so-called "green thumb" and do not have much time to devote themselves to gardening. These flowers can be grown easily in pots or directly in the ground. Sowing is carried out in a seedbed in the months of March and April, but it can also be extended in the following months as the seedlings of marigold reproduce easily and grow in a short time. The seedlings must then be thinned out to facilitate their growth. The seeds to be used the following year can be easily collected by drying the flowers, and taking them from them, in considerable quantities. During the flowering period, dry flowers must be constantly eliminated to provide vigor to young ones.
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During the period of greatest development and flowering, it is good practice to provide adequate fertilization to the soil, which should be rich in organic substances to facilitate the development of the plants, and soft enough and not too compact to allow adequate root development. For fertilization, a specific fertilizer for flowering plants must be used, either granular, slow-release, or liquid. In the first case, the fertilizer must be distributed in adequate doses directly on the surface of the soil, adjacent to the plants. In the case of liquid fertilizer, it must be dissolved directly in the water for watering, and supplied to the plants every two or three weeks.
Diseases and remedies
Marigolds are subject to the development of a fungal disease known as powdery mildew, also called "white evil", which develops due to an excess of humidity, both on the foliage and on the stem of the plant. It is mainly due to frequent watering, which also involves the foliage of the plant. To avoid its onset, you must try to water the soil directly, avoiding wetting the foliage and flowers, and using fungicidal products for preventive purposes. The other pitfalls of marigold are aphids and scale insects. The former are very harmful parasites that suck the sap of plants, causing the discoloration of the leaves and a weakening capable of compromising their survival. They fight with pyrethrum-based insecticides, or with broad spectrum ones. Caterpillars can also cause damage to plants.