Questions tagged [trees]

Common classification for perennial plants with woody, elongated stems.

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Why do old willows have so many broken limbs?

Willows have a reputation for being very flexible. In a nearby park (PA), where I often walk, there are about 20 willows growing by a stream. Willows over 30' to 40' tall have almost all their major ...
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What Causes the White Layer on These Leaves?

I recently noticed that a Malabar Java plum (Jamun) tree in our garden has most of its leaves covered in a strange white layer, like in the picture I've attached. I'm curious to understand why this ...
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Why are trees so symmetric?

Many trees have a quite symmetrical overall shape. Some are extremely symmetric. Yet when you look at the branches and limbs of any tree their distribution seems completely random. Often even the ...
Rich's user avatar
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What kind of tree has this blossom?

I filmed this beautiful blossom on a tree, this past spring in Toronto, Ontario, Canada.
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Why couldn't grafting save the Sycamore Gap tree? [duplicate]

The Sycamore Gap tree in England was recently cut down by a vandal. There is hope that the tree can be "saved" by nursing shoots that are hoped to come up from the roots. Grafting is ...
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Looking for literature that gives a systematic presentation of geometric and topological features of trees

Introduction I am a software engineer specializing in procedural generation of 3D models, and currently I'm building a generator for 3D models of trees, founded on the theoretical work of Aristid ...
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Is it possible to reconnect a severed tree trunk and save a tree?

I ask this question because I saw in a the news recently (September 28, 2023) that some vandal cut down the famous Sycamore Gap Tree I know people normally don't put trees back together, but from ...
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How are some plants and trees able to grow and thrive on little to no soil?

I was watching a documentary about abandoned soviet structures and cities. At the beginning of the documentary a piece of drone footage is shown featuring the abandoned flats of pripyat from above. ...
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Does a tree absorb carbon dioxide only by its outer growth ring?

I'm trying to understand how the amount of carbon-14 isotope is changing in a tree trunk, so I would like to clarify if a tree absorbs carbon dioxide only by its outer growth ring in a current year of ...
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For wide trees such as Alerce Milenario, can't a longer core just be made (according to web sources the tree is too wide for standard corers)

The Alerce Milenario is only a candidate for the oldest tree. The verified oldest is a bristlecone pine. Trees like Giant Sequoia and Alerce grow both tall and wide, some others stay low to the ground ...
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A tree that's making quiet "creaking" sounds, and stops when I tap it...insects?

So I have a very dead tree (not a biologist, so this just means "no leaves when the trees around it do have leaves"), and I noticed when I stand close to it I can actually hear a "...
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Please help me identify this tree/fruit. Is it edible?

When free, could the experts here please help me identify this tree. Location: Delhi, India Height: 20-30 feet Date: October Is the hanging green colored fruit edible? Thank you for all the kindness ...
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How long does DNA last in wood?

I was wondering if it's possible to find out if the wood of the table I bought is from the same tree of the chair in the same set. Most likely not, but I was wondering if it's theoretically possible ...
Joe DiNottra's user avatar
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Growing peaches from (supermarket) bought seeds

As a hobby I like to grow stuff from the seeds of fruits (or bascially everything) that I buy in grocery stores. I have heared often that if the trees will eventually grow own fruits, they will not ...
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Sex in diploid cones in gymnosperms [closed]

Gymnosperms have male and female cones. If the cones are diploid, how can individual cones be male or female?
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What are the structures that make pixel-like patterns in wood?

Some wood seems to have structures that are squarish in cross-section. I've often noticed that these are distributed in arcs or sinusoid shapes on guitar fretboards, for instance. Here's an example I ...
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What species of poplar tree is this?

I am looking for information on how to identify a poplar (Populus) tree. It is located in Dresden, Germany, next to a small stream. The city tree database lists it as Populus nigra. However, it ...
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How to distinguish hornbeam from hophornbeam?

The town where I live plants both hornbeam trees (Carpinus betulus) and hophornbeans (Ostrya carpinifolia) as street trees. How can they be reliably distinguished, especially when there is no fruit on ...
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Identification: tall conifer with tamarisk-like leaves

I am looking to identify a conifer that I found in a public park. Please see below for pictures of the leaves, bark and habit (click for full-size view). I normally use Pl@ntNet for identification, ...
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Could water soluble dyes be directly absorbed by a plant's / tree's xylem?

Amateur woodworker / hobbyist here, I enjoy using colorful or exotic wood species, the issue is that many of these species are rare, expensive, endangered, hard to grow, or otherwise difficult to ...
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Coniferous tree with alternating bunches of short needles (Toronto area)

What species of tree is this? Location: East of Toronto, zone 6; urban Date of photos: May 10, 2022 Diameter at breast height: ~18 inches Height: ~30 ft
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What kind of tree has leaves like this?

Shot taken in Spring, on May 22, 2020 in a forest in Haliburton, Ontario.
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What kind of deciduous tree is this?

This image was captured on October 10th, 2020 in Haliburton, Ontario, Canada. Any help identifying the tree species is greatly appreciated. Rob.
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Were fall foliage leaf colors in Canada also delayed in autumn 2021?

English is not my first language. I didn't fully grok this National Geographic article published November 24 2021 by Sarah Gibbens. But it discusses just the eastern U.S.A., NOT Canada. How ever what ...
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Could a tree grow in a low pressure environment?

Could a tree grow in a low pressure environment? If you had a pressure say, 10% of that of Sea level could a tree grow if it was in the proper soil and watered regularly?
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Identification of tree seed pods observed in Western Australia near the city of Perth in February

These where observed during a holiday in Western Australia near the city of Perth in February 2019. I assume they are tree seed pods. But from which tree?
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How related are trees?

I was surprised to see how far apart macadamia and hazelnuts are from each other. I always thought all trees had a common ancestor that was also a tree. But that doesn't seem to be the case? Did wood ...
Ivan Viti's user avatar
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why do some trees have trunks that branch out and others don't?

I've never seen a bald cypress that had a tree fork but oak trees have them all the time. Any ideas as to why this is? Bald Cypresses are usually found in very wet areas whereas oak trees tend to be ...
neubert's user avatar
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Why does this tree have a round hole?

One of my soccer students was hiding behind a tree when he discovered this hole. I've tried Googling it but I couldn't find out why this tree has a hole.
Jossie Calderon's user avatar
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Where can I find a list of trees in the world? [closed]

I want to make an app for smartphones that list most common trees in the world. Where can I find a list? I would like to include if the tree is deciduous or perennial and geography/climatic location. ...
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What is this plant with yellow large fruit?

Found this in a garden in San Francisco. Can't decide if it's pomelo, capri lemon or something else, ideas?
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What made this pile of tiny poops at the base of an old oak? Eastern Long Island, NY

I ran across three trees (all with cavities) that had mounds of these small droppings at their base. These were approximately 50-100 meters from the shore of a salt marsh on the east end of long ...
That Idiot's user avatar
4 votes
1 answer
159 views

Tree identification in the Caribbean

I live in Puerto Rico and I'm trying to identify this tree and if possible how to kill it since it is infested with termites. https://i.stack.imgur.com/2TfN5.jpg Tree Closer view of flowers and ...
Rick's user avatar
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Evolution at a glacial pace: how does it work? [duplicate]

Some trees are very long-lived, such as the Great Basin Bristlecone Pine and the Giant Sequoia (up to 4,800 years old). How does natural selection and evolution affect such long-lived organisms? ...
cowlinator's user avatar
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Does anybody know what kind of tree is this?

I saw this tree yesterday and I liked it. It is around 1.5 m. I did some search on internet and thought it might be Holly, but I'm not an expert on trees. So I wanted to ask you, does anyone know what ...
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Why do trees prefer their sunlight a bit diffused?

I don't know what "a bit diffused" here means. Do other plants also "prefer their sunlight a bit diffused"?      Mount Pinatubo was the most powerful volcanic eruption in nearly ...
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3 votes
1 answer
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Tree identification

I went to Araku few days ago and saw this tree in a garden . Here are the leaves I know the pic of fruits is a bit hazy and out of focus,but it's the best I have. These trees were in a cluster ,...
Amarylis Vaselaar's user avatar
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Function of the 'double' leaf on a pomelo tree

What is the function of the 'double leaf' (I'm unsure what the technical name is...) on a pomelo tree leaf? Furthermore, what evolutionary 'problem' is this structure solving? See image with arrows ...
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How is silica transported to the leaves of genus Dendrocnide trees to form stinging needles for toxin delivery?

I just read the NYTimes' This Tree’s Leaves Look Soft and Inviting. Please Don’t Touch Them. which mentions the genus Dendrocnide and that Wikipedia section begins with: Contact with the leaves or ...
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What's the name of this green fruit with little pikes fallen from a city tree on the pavement?

What's the name of this green fruit with little pikes fallen from a tree on Paris (France) pavement ?
DevonDahon's user avatar
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What is the fate of the typical tree?

Walking through the local established broadleaf forests dominated by oak and tulip poplar (Eastern U.S.), it is common to find patches of young tree saplings, say 10-20 oak or tulip poplar saplings ...
mdr's user avatar
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Tree Identification - California Bay Area

I've seen these trees in the Bay Area in Mountain View and Fremont, and have been searching for different pine tree varieties that have wider canopies. Does anyone here know what trees these are, they ...
foobarometer's user avatar
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Tree-pest coevolution

Many trees first reproduce decades after germination. Many pests of trees reproduce in under a year. It would seem that the pests have an advantage in the evolutionary arms-race, as they can evolve ...
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What causes the yellow and brown spots on our sour cherry tree?

So at the end of spring (maybe at the beginning of summer) our sour cherry tree started producing these yellowish/brownish spots on its leaves. Can you help me identify the couse of this? What can we ...
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How are large snails able to climb trees?

In answers to What kind of hot pink eggs are these? and the linked duplicate I found out that snails that live in the water will climb up a smooth stick or branch to deposit their eggs. Today I saw ...
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Identification and odd leaf anomaly

We're in the process of welcoming sheep, thus setting up the fences, now inside on of the areas, there is a small tree. Never seen leafs like this before. I suspect this to be some sort of anomaly/...
Vincent Duprez's user avatar
2 votes
1 answer
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Carotene in Dracaena draco

I'll keep this question straight and simple: Some succulent plants produce carotene, a red pigment, in response to great heat, turning their leaves red. The dragon blood tree (Dracaena draco) is ...
Mat NX's user avatar
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6 votes
1 answer
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Trees growing around objects vs pushing them away. Where is the threshold?

If a tree grows against a taut wire then the tree will grow around it, eventually enveloping the entire wire. This often scars the tree, and if the wire is thick enough, it will interrupt nutrient ...
bitsmack's user avatar
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How do tree gnarls develop?

What causes the trees to develop gnarls? I can't find anything on internet other than dictionary definitions. Are they caused by a mold, like the burls?
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Why do quaking aspens quake?

I've just finished reading The Hidden Lives of Trees by Peter Wohlleben, which I thoroughly enjoyed. According to the author, the advantage of shaking the leaves is that both sides of the leaf are ...
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