Learn how to identify, control, and prevent weeds in your garden to keep plants healthy and flawless landscaping
Submitted at Apr 28, 2026, 8:00 PM
Picão-preto: Muito comum em hortas, cresce rápido e pode prejudicar o desenvolvimento de outras espécies ao redor. (Blog Syngenta Digital/Divulgação)
Weeds appear frequently in gardens, vegetable gardens, and even in small pots. Despite the name, they are not necessarily "bad plants," but rather species that grow where they are not wanted. The problem is that their presence can interfere both with plant health and with the aesthetic result of landscaping.
Trevo: Forma tapetes densos em gramados e compete diretamente com a grama por espaço e nutrientes. (Lizgarden/Divulgação)
Besides appearing easily, these plants tend to spread quickly, taking over spaces previously intended for ornamental or edible species. Therefore, understanding their behavior and knowing how to deal with them is essential to keep the garden balanced and well cared for.
Weed is any plant that sprouts spontaneously in an unwanted place. This means the classification depends on context: a plant can be useful in one project and considered invasive in another. In general, they are hardy, highly adaptable species.
Tiririca: Erva daninha de difícil controle, com raízes profundas que permitem sua rápida regeneração mesmo após a remoção. (EasyFarm/Divulgação)
Another important point is that these plants have rapid growth and a great capacity for reproduction. Many produce abundant seeds or multiply via roots, which makes control difficult and favors constant emergence.
The ease with which weeds emerge is directly linked to their resistance. Their seeds can remain in the soil for long periods, germinating as soon as they find ideal conditions, such as light, moisture, and available nutrients.
Trevo. (eCycle/Divulgação)
In addition, external factors contribute to their spread. Wind, rain, animals, and even gardening tools can carry seeds from one place to another. Exposed, poorly protected soils also favor this spontaneous growth.
The main impact of weeds is the direct competition with cultivated plants. They compete for essential resources such as water, sunlight, and nutrients, which can weaken the development of the desired species.
Dente-de-leão: Suas sementes leves se dispersam facilmente pelo vento, favorecendo o surgimento em diferentes locais. (Mundo Agro/Divulgação)
Some weeds also release substances into the soil that hinder the growth of other plants. In addition, they can serve as shelter for pests and diseases, increasing the risk of infestation and harming the garden’s overall balance.
Picão-preto. (Viveiro Orgânico de Ervas e Temperos Sabor de Fazenda /Divulgação)
Considered one of the most difficult to eliminate, it has deep roots and underground structures that facilitate its multiplication. Even after removal, it can grow back easily.
Very common in lawns, it forms a dense cover that competes with grass for space and nutrients, changing the garden’s appearance.
It grows quickly and spreads easily, especially in areas with bare soil, forming an invasive “carpet.”
Known for its yellow flowers and windborne seeds, it spreads quickly and can appear in different types of soil.
Very common in vegetable gardens and beds, it grows easily and can interfere with the development of surrounding plants.
These species are frequent because they adapt well to different conditions and display efficient strategies for reproduction and survival.
Weed control can be done manually, pulling the plant out by the root to prevent it from growing back. This method is best suited to small areas and home gardens.
Capim-colchão: Espalha-se rapidamente em áreas abertas, criando uma cobertura invasora que sufoca outras plantas. (UAI/Divulgação)
Prevention, however, is one of the most effective strategies. Keeping the soil covered with straw, bark, stones, or groundcovers helps reduce the space available for germination. In addition, regular maintenance, with proper watering and balanced fertilization, strengthens the desired plants and makes invasion more difficult.
Tiririca. (Rehagro/Divulgação)
In more severe cases, the use of herbicides can be considered, but always with care, especially in residential projects. With ongoing attention, it is possible to keep weeds under control and ensure a beautiful, healthy garden.
CASACOR Publisher is an exclusive content-creation agent, developed by CASACOR’s Technology team from the knowledge base of casacor.com.br. This text was edited by Chrys Hadrian.
