AMERICAN GARDENER

The deadliest plants in the world are often disarmingly ordinary-looking, growing as roadside weeds, garden ornamentals, or shade trees rather than anything that visually announces its danger. That gap between appearance and actual toxicity is precisely why so many of history’s most notable plant poisonings, including at least one that reshaped a young Abraham Lincoln’s … Read more

Weeds that cause skin irritation don’t all work the same way, which is part of why so many people get caught off guard by plants that don’t look obviously dangerous. Some rely on an allergic chemical reaction that only affects sensitized individuals, some deliver a genuine chemical burn triggered by sunlight, some inject irritating compounds … Read more

Weeds with large leaves tend to stand out immediately in a landscape, often towering over neighboring plants or spreading a single leaf wide enough to shade out everything beneath it. That oversized foliage usually serves one of two purposes: capturing as much sunlight as possible to fuel unusually fast growth, or storing enough energy in … Read more

Weeds with milky white sap span a surprisingly wide range of unrelated plant families, which makes the trait a genuinely interesting case of convergent evolution rather than evidence of any close relationship between the species that share it. That milky fluid, technically called latex, typically serves the same defensive purpose across every family that produces … Read more

Weeds that look like clover trip up gardeners for a simple reason: three-leaflet foliage is an extremely common and successful leaf arrangement across several completely unrelated plant families, not a trait unique to true clover in the genus Trifolium. According to Penn State Extension’s guide to trifoliate lawn look-alikes, telling these plants apart comes down … Read more

Weeds that look like wheat pose a genuinely different challenge than most garden weeds, since the goal usually isn’t to identify a plant growing where it shouldn’t, but to spot an impostor hiding in plain sight among an actual wheat crop. Many of these species evolved or were selectively favored specifically because their seedlings, growth … Read more

Types of dandelion go far beyond the single yellow lawn weed most people picture, since the genus Taraxacum is one of the most taxonomically complicated in the entire plant kingdom. According to the Flora of the Southeastern United States, maintained by the University of North Carolina’s Botanical Garden, the genus includes roughly 60 broadly recognized … Read more

Edible weeds in Australia grow in a genuinely unusual mix, since the continent’s naturalized weed flora is overwhelmingly made up of European, Mediterranean, and South African species introduced since colonial settlement, layered on top of a smaller number of native plants that Indigenous Australians have eaten for tens of thousands of years. That combination means … Read more

Gardening remains one of the most popular hobbies in the United States, with national surveys consistently finding that more than half of American households participate in some form of lawn or garden activity each year, collectively spending tens of billions of dollars annually on plants, tools, and equipment. Many of the hand tools gardeners rely … Read more

Weeds that are edible make up a surprisingly large share of the plants most gardeners spend their summer pulling and discarding, and several of them turn out to be more nutritious than the vegetables planted right next to them. Before trying any of the plants on this list, positive identification is essential, since a number … Read more