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  2. Beneficial weed - Wikipedia

    en.wikipedia.org/wiki/Beneficial_weed

    Crow garlic, like any Allium, masks scents from pest insects, protecting neighboring plants [citation needed]. Many weeds protect nearby plants from pest insects.Some beneficial weeds release volatile organic compounds that mask the scents of nearby plants, as with alliums and wormwood; others imitate the pheromones of pest insects and confuse them, as with ground ivy, oregano, and other mints.

  3. List of beneficial weeds - Wikipedia

    en.wikipedia.org/wiki/List_of_beneficial_weeds

    Broccoli, tomato, [2] valerian, mint, fennel: Despite its "sting", young plant parts are edible, as is much of the plant when blanched or otherwise prepared. It can be used to make herbal tea: Also once grown as a crop for its fiber. Its juice was once used in the place of rennet in cheese-making. It was also a source of "green" for dye.

  4. List of companion plants - Wikipedia

    en.wikipedia.org/wiki/List_of_companion_plants

    Tomatoes grow better with carrots, but may stunt the carrots' growth. Beans provide the nitrogen carrots need more than some other vegetables. Aromatic companion plants repel carrot fly. Alliums inter-planted with carrots confuse onion and carrot flies.

  5. Nitrogen deficiency - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_deficiency

    A young cabbage plant exhibiting nitrogen deficiency. Nitrogen deficiency is a deficiency of nitrogen in plants. This can occur when organic matter with high carbon content, such as sawdust, is added to soil. [1] Soil organisms use any nitrogen available to break down carbon sources, making nitrogen unavailable to plants. [1]

  6. Green manure - Wikipedia

    en.wikipedia.org/wiki/Green_manure

    The ratio of carbon to nitrogen in a plant is a crucial factor to consider, since it will impact the nutrient content of the soil and may starve a crop of nitrogen, if the incorrect plants are used to make green manure. The ratio of carbon to nitrogen will differ from species to species, and depending upon the age of the plant.

  7. Fertilizer - Wikipedia

    en.wikipedia.org/wiki/Fertilizer

    Although nitrogen makes up most of the atmosphere, it is in a form that is unavailable to plants. Nitrogen is the most important fertilizer since nitrogen is present in proteins (amide bonds between amino acids), DNA (puric and pyrimidic bases), and other components (e.g., tetrapyrrolic heme in chlorophyll). To be nutritious to plants, nitrogen ...