An oak is a hardwood tree or shrub in the genus Quercus of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisphere, with some 500 species, both deciduous and evergreen. Fossil oaks date back to the Middle Eocene. Molecular phylogeny shows that the genus is divided into Old World and New World clades, but many oak species hybridise freely, making the genus's history difficult to resolve.
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Sarah Adamson · Scotland, United Kingdom · CC0
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1 articleEvery article on Plant News that mentions a member of this genus, newest first.
Northern red oak sightings logged by Canadian iNaturalist users dropped to 124 this week from 182 the week before, still enough to rank among the country's most-observed plants as autumn leaf color draws attention to oaks.
If you've noticed your beech or oak leafing out earlier some springs than others despite similar average temperatures, this...
If you're out walking this week, the red oak's deep burgundy fall leaves and scattered acorns make it one of the easiest trees...
A coast live oak growing on a residential street in your neighborhood could be hundreds of years old, since this species can...
Every confirmed Oregon oak sighting helps conservationists track where this slow-growing native tree still survives, since...
If you've noticed your allergies flare up on different days depending on which park or neighborhood you're in, this model...
The compost or soil amendment you spread in your garden could one day come from treated wastewater sludge, and this research...
The yellow pollen dusting your car and patio furniture each spring isn't just allergy fuel, it's a nutrient pulse that feeds...
If you're picking a shade tree for a yard or noticing which park bench feels cooler in August, this study explains why:...
The oak dropping acorns in your neighborhood park is quietly reprogramming which genes turn on and off as it cycles through...
The oak in your yard and its resident caterpillars might not be as finely matched as nature documentaries suggest, which...
If you've ever wondered why the alpine tree line on a mountain hike forms such a sharp edge, this explains it: it's not one...
The gnarled evergreen oak shading an Oakland sidewalk is a living remnant of the woodland that once covered the East Bay...
The acorns dropping in your neighborhood woods each fall are part of a chain reaction that reaches mice, ticks, and ultimately...
Every pine, oak, birch, and spruce you walk beneath relies on root fungi like Laccaria bicolor to mine zinc and other minerals...
Roadsides and construction scars near your neighborhood could become functioning green corridors — and this research shows...
Oak trees in your local woodland are running a seasonal hydraulic gamble — their spring growth floods the tree with fast but...
White oaks in your region support over 500 species of caterpillars and moths, making a single mature tree one of the most...
If you've ever tried direct-seeding oaks in a restoration planting or food forest only to find them all gone within a week,...
Cork oak forests covering Portugal's rolling hillsides — the source of every natural wine cork — are quietly dying, and a...
If you're planting oaks for urban restoration or windbreaks in areas with road salt or alkaline soils, the provenance tag on...
Every acorn you see forming on an oak this summer may actually be the result of a pollination event from last year — a...
When foresters choose which oak trees to plant in your local park or watershed, picking trees whose ancestors survived...
Chinkapin oaks are excellent drought-tolerant shade trees for Texas gardens, and knowing they grow naturally near Anna means...
Willow oaks lining Raleigh streets provide dense summer shade and drop small acorns that feed birds and squirrels—knowing...
Truffles are cultivated as a high-value crop by planting inoculated trees, and understanding whether non-native truffle...
Coast live oaks are keystone trees that support hundreds of species of birds, insects, and wildlife — spotting one thriving...
Holm oaks are drought-tolerant Mediterranean trees increasingly planted in California cities, and tracking where they grow...
It means the specific acorn or seed you plant — not just the soil or environment you provide — carries a hidden chemical...
The acorns dropping in your neighborhood woods each fall are part of a chain reaction that reache...
Truffles are cultivated as a high-value crop by planting inoculated trees, and understanding whet...
Every acorn you see forming on an oak this summer may actually be the result of a pollination eve...
The oak dropping acorns in your neighborhood park is quietly reprogramming which genes turn on an...
If you've ever wondered why the alpine tree line on a mountain hike forms such a sharp edge, this...
The yellow pollen dusting your car and patio furniture each spring isn't just allergy fuel, it's ...
If you've noticed your allergies flare up on different days depending on which park or neighborho...
The oak in your yard and its resident caterpillars might not be as finely matched as nature docum...
Every pine, oak, birch, and spruce you walk beneath relies on root fungi like Laccaria bicolor to...
