Submitted via Google Form:
Hope this isn't a weird question but from personal observation, why don't plantlife other than weeds seem to reproduce on their own in people's yards? I have observed for quite a long time and it seems like a very weird thing to happen. I don't know if it has something to do with what people do while gardening, but from what I do with my garden, I never intentionally remove seeds etc that could grow, not that I've ever even seen any. So, new plantlife (other than annoying weeds) never show up on their own. That seems so weird. What does this have to do with writing? Well it'd be nice to have characters who come across new surprises in their gardens every now and then when non weeds decide to settle there. That should very well be possible and sounds just natural... I just don't get why it never actually happens in real life. I've even asked people and they've never had anything nice that just decided to settle on its own. No one could say why though and thought my question was interesting. Oh, and about weeds. But why the wilderness doesn't get overrun by weeds yet people aren't weeding them I think? Yet in people's abandoned gardenss are full of weeds.
Tex: Things generally won’t reproduce if you keep killing them every time you see them - this is what pesticides and herbicides do, which are just some pretty words for environmental poisons that end up affecting all other plant life around it. Man-made poisons can sit in the ground for decades, which is why it’s generally advised not to grow plants made for eating on golf courses, and the soil needs at least a decade of remediation before it’s considered in the realm of safe for interaction, much less agriculture or remanding the land back to nature.
“Annoying weeds” serve an ecological and cultural purpose. The following plants are used as examples, pulled from the The Spruce as cited “weeds”. Much of this information is drawn from memory, or the accompanying Wikipedia pages, which are numerous and easily found:
The long tap root of dandelion aerate the soil, reduce erosion, are frequently eaten, used for medicinal purposes, and encourage pollination and diverse insect and wildlife.
Chickweed is edible for both humans and livestock such as chickens and mountain sheep - which will bring dung that fertilizes the soil and remineralizes it, when not also being used as a folk medicine.
Plantain breaks up hardpan, prevents soil erosion, can be eaten by humans (the young leaves are high in calcium), and also used medicinally.
Ragweed is from the wormwood family, which while it can incite allergies, is also used medicinally to treat intestinal parasites (although too much can cause hallucinations), when not being used to pull lead from the soil.
Bindweed can be used for folk medicine to treat hypotension due to its glycoside content (side effect of being toxic to mice).
Ground ivy, and also deadnettle, are part of the Lamiaceae family, which is related to mint and sage. The former can be used for beer brewing, medicine, and as a rennet substitute for making cheese. The latter are unrelated to stinging nettle (their name only means that they are considered “dead” in comparison), and function as sometimes ornamental groundcover, which is useful for preventing soil erosion.
The purslane family is quite edible to humans, and can be fed to livestock such as chickens, when not being a source of food for some types of moths, which increases biodiversity.
Stinging nettle is very nutritious and can be used in folk medicine for things like arthritis, when not also being used as a source to make textiles.
Yellow dock is related to buckwheat, and indeed the seeds can be ground into a flour. It’s also high in iron, so can be used medicinally (to some degree) to treat anemia, as well as a wider array of uses.
Wild madder is from the Rubiaceae family, which also contains bedstraw (historically used to stuff mattresses) and coffee. Plants with madder in the name are typically used to dye textiles, and its long tap root - similar to dandelion - also helps break up the soil and allow aeration.
White clover fixes nitrogen in the soil, outcompetes weeds, and is also edible. Additionally, the flowers can be smoked recreationally, and the leaves assist with the curing of a tapeworm infection.
Jewelweed is fungicidal, and its saponins can - if used carefully - treat poison ivy rashes. The young shoots can be rendered into a potherb, but it’s not recommended due to the oxalic content.
Staff vine (some cultivars) can be used for rope-making, basket-making, and some livestock can eat it without any ill effects.
Horsetail (some cultivars) is edible for humans, though can cause toxicity in large amounts to grazing animals such as horses (name of no relation to this phenomena, but to how it looks). In small amounts if can be medicinal.
Canadian thistle is from the Asteraceae family, and is related to daisies. It has a long tap root that is edible to humans, can be used to make gin, and has also been used to fletch blowgun darts.
Quackgrass, or couchgrass, is native to most continents on the planet and is thus a common food source for grazing animals and also many types of birds and some types of butterflies. This, then, increases biodiversity.
Shepherd’s purse has the distinctive ability to lure and eat nematodes, which fertilize the soil. It is edible by both humans and livestock, and can be used in folk medicine.
Wood sorrel (multiple cultivars) has a significant amount of oxalic acid, but its leaves can be eaten by humans after some preparation.
Mallow (multiple cultivars) is edible to humans, and can be used medicinally.
Lamb’s quarters, also called goosefoot or wild spinach, is from the Amaranthaceae, and is related to spinach, beets, chard, amaranth, plumed cockscomb, and quinoa. It can be cultivated in lieu of spinach as a vegetable crop, can be fed to livestock, and the juice of the plant has been attested to make wall plaster.
Pigweed is related to lamb’s quarters, as it is from the same Amaranthaceae family. They are often considered nutritious, though may need some preparation to be used as a vegetable.
Nutsedge, or tiger nut, is quite often eaten, and the oil can be considered a biofuel.
Dayflower is widely used as a medicines and dye, and can be eaten by both humans and livestock.
Velvetleaf can be used to for rope-making, paper-making, and caulk. It’s also edible to humans, and used in folk medicine.
Wild violet is a main food source for many bees and butterflies, increasing biodiversity. It can be used for medicine, but other cultivars are more often utilized.
Smartweed is from the Polygonaceae family, which makes it related to buckwheat and also knotweed. It is an important food source and habitat for many types of birds, and can be used in folk medicine.
Quickweed, like Canadian thistle, is also from the Asteraceae family. It is edible to humans, and can be eaten either in soup or a salad.
Pokeweed, also known as pigeonberry weed or inkberry, is edible to songbirds, which increases biodiversity. While toxic to mammals, it can be used medicinally, if sometimes edible after much preparation. The berries can be used to make dye, and one cultivar is being used in biomedical research.
Black nightshade, despite its toxicity, can be eaten depending on the cultivar and level of preparation required (tread carefully!), and has a long historical usage as a folk medicine.
Black medic, also known as hop clover, is from the Fabaceae family (aka legumes, peas, and beans), but is most closely related to the other clover genera Trifolium and Melilotus, and is closely related to alfalfa. It fixes nitrogen in the soil, and is frequently used by bees, which increases biodiversity.
Poison ivy, interestingly, is not a true ivy but rather from the Anacardiaceae family, which makes it a relative of plants such as cashews or sumac. Birds and other animals that are unaffected by urushiol often eat it, which increases biodiversity.
Barnyard grass, also known as cockspur or Japanese millet, can be used to reclaim saline and alkaline areas, can be eaten by some livestock and wild animals, and also eaten by humans.
Goosegrass is related to finger millet, the latter of which is a cereal crop, and comes from the Poaceae family, which hosts most cultivated cereal grains.
Annual bluegrass also comes from the Poaceae family, like goosegrass, and can be considered a type of fodder grass.
Hairy bittercress is from the Brassicaceae family, which makes it related to mustard and cabbage plants. It is edible to humans, and can be eaten raw or cooked.
Henbit, like ground ivy and deadnettle, comes from the Lamiaceae family. It is also edible to humans, and can be eaten raw or cooked.
Lawn burrweed, also known as field burrweed or common soliva, is from the Soliva genus, and thus related to sunflowers. It is also of the Asteraceae family, which makes it related to daisies. As its name suggests, it has burrs on it.
Bahiagrass is from the family Poaceae, liked barnyard grass, goosegrass, and annual bluegrass. It is used for forage by livestock, and controls soil erosion.
These plants are not “weeds” - what they can be, however, is disruptive to local ecologies or otherwise not considered economically important enough to utilize (many of these plants are used as food outside the United States, for example).
The wilderness does not get overridden by weeds because it has an ecosystem generally untouched by humans. This means that the potential for invasive plants is low without human interference, and many plants that do occur from outside the environment can be naturalized and used as an alternate food source by insects and animals.