For questions about trees: selection, planting, care, diagnosis, pruning, etc.

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6
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1answer
511 views

Identify this tree with two different types of leaves?

There are 2 types of leaves sprouting from the mystery root here. You might guess that one is a sprig of tree leaves and the other leaves belong to a weed, but in fact both are growing directly from ...
4
votes
1answer
127 views

Can this tree be an eucalyptus tree growing in Central Europe?

I have this tree in my garden. The previous owner, who planted it, told me it is a kind of eucalyptus. When rubbing a leave between the fingers it indeed has the smell I know of eucalyptus-sweets. 3 ...
5
votes
2answers
200 views

How far apart should I space Thuja 'Green Giant'?

If I wanted to plant several Thuja plicata x standishii 'Green Giant', how far apart should they be placed, or does it matter? Some evergreens seem to like being planted close together (and growing ...
5
votes
3answers
61 views

Does a Japanese maple require special care when a post-hole is dug in the root system?

I need to put a post down to support a carport. The post would be embedded in a concrete block approx. 60cm x 60cm. This is 3 metres from the trunk of a Japanese Maple about 5 metres tall. Is there a ...
4
votes
1answer
319 views

What is the term for this pruning technique that causes stubby, clublike branches?

These Platanus × acerifolia trees (London Planetree) were pruned to have this short, stubby branch structure. What is this called, and how is is done?
6
votes
4answers
563 views

Can I graft a branch of a sweet orange onto a sour orange tree to get sweet fruit?

I have two old citrus trees, one bears sweet navel-type oranges and the other has hundreds of impossibly sour, tiny oranges. Would it be possible to chop off a branch from the sweet tree and attach ...
3
votes
2answers
53 views

Do sumacs transplant well?

We are having difficulty sourcing sumacs (Rhus copallinum) larger than 6-7' locally, so we are considering digging some from an old field. We can find 8-10' plants in the ground fairly readily. Are ...
4
votes
2answers
216 views

What is apical dominance?

When pruning trees, most notably conifers, you must be aware of a phenomenon known as 'apical dominance', when choosing your pruning technique, and selecting shoots for the permanent structure. What ...
9
votes
1answer
153 views

What is this woody plant with spicy, citrus flavored twigs?

I was out hiking today, and, as I often do, I absentmindedly chewed on twigs that I broke off from around shoulder height. I noticed that one twig had a spicy, citrus flavor. It reminded me of ...
3
votes
1answer
269 views

What evergreens will tolerate alkaline clay soil in USDA zone 4?

Although the area where I live is famed for it's white pine they grow in sandy soils. My garden has a thin skim of topsoil over six feet of compact alkaline (ph 7) clay. My dwarf white pine is doing ...
6
votes
1answer
107 views

How do I treat and care for trees infested with borers?

One of my apple trees recently started to look like it's dying (leaves dying when they shouldn't, bark peeling, lack of fruit, new branches growing and then quickly dying). My neighbor looked at it ...
4
votes
2answers
546 views

What happens when a chainsaw chain meets a nail or piece of steel wire when cutting through wood?

Assuming any of the following: there's an unnoticed steel nail in a log used in some structure or there's an unnoticed steel nail in a tree body (often happens when people attach illegal ads to ...
4
votes
1answer
87 views

Help me to identify these two trees in my back yard?

I have two trees in my backyard that I need help identifying. My home is in Port Saint Lucie, which is on the eastern coast of the southern half of Florida. Hardiness zone 10a. My home backs into a ...
3
votes
2answers
100 views

Which high-desert-friendly tree should I plant beside my driveway?

My property (New Mexico, climate zone 7a) has a patch of ground between my driveway and a fence that's begging for a tree to be there. It's about 11 feet wide. Apparently a tree was there before, as ...
2
votes
1answer
552 views

Is it normal for palm trees to drip a brown gummy sap?

Our apartment in Tenerife has palm trees surrounding it and these trees are continuously dripping a brown gummy substance, we presume from their leaves, onto our tiled floor. We are informed that ...
4
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0answers
83 views

How much should I water an avocado plant guided by a moisture meter?

I have a moisture meter that registers readings from 0.0 to 9.9 (driest to wettest). I cannot find a listing for a potted avocado tree. Can you give me info as to what percentage is optimal for the ...
3
votes
1answer
86 views

Are these trees some type of poplar?

Here are a few pictures of some trees in my yard. I am trying to determine what type they are. I'm fairly certain they are some type of poplar tree. But I am not sure of the specific type. This is in ...
6
votes
2answers
518 views

Is this an Oak Tree?

I've got this tree down in my back yard and I cannot figure out what type it is. The bark looks like Oak but the leaves I'm not sure about. There have been no nuts/acorns drop from it that have been ...
5
votes
1answer
109 views

What are these trees in the front of the picture?

Here are the trees I'm wondering about: They are growing in Hong Kong. They have moderate length leaves pointing downwards, and are twice as tall as road signs. They look like young palm trees, ...
5
votes
2answers
209 views

Do I need to change the irrigation for my Shamel Ash trees?

I have three Shamel Ashes in my yard, all planted at roughly the same time and all irrigated in the same way. Despite professional care they haven't shown any substantial growth in over a year. If ...
5
votes
2answers
175 views

How do I get ready for a stump grinding, and how long afterwards should I wait to replant?

The city has cut down my dead ash tree and are coming to remove the stump (I believe by grinding). They have advised me to "remove landscaping features" so they aren't destroyed in the process. How ...
2
votes
1answer
65 views

My Emerald Arborvitaes are Yellowing on the Inside! [duplicate]

I live in Utah and the weather is getting a bit colder. About a month ago all my of trees were going very strong, all green throughout, but now they are starting to yellow from the inside out. This ...
3
votes
1answer
306 views

Can the roots of a Redwood tree lift up the foundation of my house?

I have a large (80 years old) Redwood Tree in my front yard, approximately 10 feet from the house. My house is a ranch style house and I can see the roots of the tree go under the house in the front ...
3
votes
2answers
234 views

Is dolgo crabapple a dwarfing rootstock?

Emerald Spire crabapple is produced by grafting onto Dolgo crabapple stock. I know that apples are commonly grafted onto crabapple rootstocks to dwarf them. On a Dolgo root stock the tree nominally ...
4
votes
2answers
87 views

Is early October too late to plant a Pussy Willow in southern Ontario?

I have a pussy willow that has rooted. It was part of a floral arrangement that I used to stage my condo while I was selling it. Now I have moved to a house with a garden so I would love to plant the ...
4
votes
3answers
411 views

Should I remove the suckers from the base of my new tree?

I bought a new tree this summer. Lately I've been seeing this little sprouts coming out of the very base of the tree. Should I chop them off or leave them? What will happen to them over time? Also, ...
3
votes
1answer
65 views

Should I be concerned about twisted galls on my lombardy poplar trees?

We have lots of large twisted galls on our lombardy poplar trees' leaf stems. I've heard that twisted galls on poplar trees are not a threat to the tree. So, I'm not worried about them killing the ...
3
votes
1answer
200 views

Is it important to deal with gall wasps on oak trees? If so, what is the best method?

Gall wasps are a common problem here on the east end of Long Island. Oaks are a dominant species around here, and many clients rely on them for shade around their houses and yards. What should be done ...
4
votes
1answer
57 views

How can I determine the variety of an apple tree that hasn't fruited?

Perhaps 10 years ago I planted several apple trees on my farm. These may have been bought at the local blue or orange store and I've long since forgotten the varieties planted. I didn't keep such ...
5
votes
1answer
297 views

Should I plant a Common Hackberry tree in my front yard for shade?

My front yard (in Northern New Mexico, zone 7a) is in desperate need of a shade tree. The soil is relatively poor and there's not a lot of water. I'm making a list of trees that I think would work in ...
1
vote
1answer
82 views

Will coppicing a Siberian elm tree get rid of bacterial wetwood (slime flux)?

Will coppicing a Siberian elm tree cure it of bacterial wetwood or slime flux? I know you can coppice Siberian elm trees and they will grow back (if what I've read about people trying to kill the ...
0
votes
1answer
43 views

In graft hybridisation does a younger stock facilitate more extensive hybrid effects in the scion?

There are anecdotes and articles where one kind of tree fruit scion has been grafted to the stock of another kind, perhaps with an interstock, and properties like flavour and shape have been affected ...
6
votes
3answers
639 views

Do pine beetles kill healthy pitch pines, or is it safe to plant seedlings to replace trees killed by them?

We need to remove a number of trees that have been killed by some kind of pine beetle - presumably black turpentine beetle - on eastern Long Island. These trees had suffered injury from salt spray ...
4
votes
2answers
144 views

What is this white flowered tree?

Could anyone identify this white-flowered tree please (planted in the UK), I was told the name and I think it begins with an 'S' but I can't remember it
3
votes
3answers
184 views

What's wrong with this Photinia fraseri tree?

I've got three Photinia fraseri trees in my yard in Tucson, Arizona. They were planted last May (2013) and now in September (2014), one of them is turning entirely brown and losing all its leaves ...
4
votes
1answer
212 views

Why Do Trees In Swampy or Wet Areas Change Color Earlier?

Not a gardening question per-se, but I believe this is the best exchange for it. It had been my observation here in the northern temperate zone that trees growing in low-lying, wet areas change to ...
4
votes
3answers
376 views

Can I cover mature tree roots with fresh wood chips?

We are having trees trimmed and the branches put through a wood chipper. Can we use the resulting mulch to cover exposed roots on mature trees as soon as the come out of the chipper?
3
votes
1answer
266 views

How should I care for a new Mimosa tree growing out of an old Mimosa stump?

We lost an old Mimosa to borers and it fell over in a wind storm. This spring it started a new growth out of the cut stump.It looks healthy but is growing RAPIDLY and it does not have much space. We ...
5
votes
2answers
416 views

What's this seed? Maple? Sycamore?

The seeds pictured below fall around my neighbourhood every Autumn (Southern Hemisphere - New Zealand). The seeds are blown over quite a vast area and I haven't been able to identify the tree(s) ...
6
votes
1answer
347 views

What is this tree with ovate-elliptical, serrate leaves, and racemes of small berries?

Asking from northeast New Jersey. Sorry I couldn't get a better picture of it - I'm hoping this is enough to identify it. These pictures were taken from below the tree branches. The tree is in the ...
6
votes
1answer
181 views

Can anyone identify this seed/fruit and what tree it has come from?

I was given this seed/fruit by a friend who found it on a walk through the countryside. I have no clue what plant it is from and want to plant it. I'm from Ireland but I'm pretty sure it is not a ...
3
votes
1answer
191 views

Is it possible to graft together a self-pollinating cherry tree?

Earlier today I asked this question: How do you tell if a tree is male or female? because I've been looking into fruit trees and learning about what is needed for them to bear fruit. So based on this ...
9
votes
1answer
14k views

How do you tell if a tree is male or female?

I was reading through some of the questions on fruit trees, because I've been thinking about getting some blueberry bushes and cherry trees, and I see a lot of people mentioning that the trees don't ...
3
votes
2answers
276 views

What small pines and deciduous trees are suitable for terrarium culture?

I am building a terrarium for some ex-Oregon family members. I really want to capture Oregon with its moss, ferns, trees and of course pine trees. I don't know of really any small pine trees that ...
4
votes
1answer
145 views

What is this tree with alternate leaves, and large green fruits?

I was told it was an almond tree, but after looking almond trees up, I don't think that's what it is. The green drupes turn yellowish/brownish and partially split open and drop. When I open them, ...
6
votes
3answers
663 views

How do I kill this salt cedar?

The front yard of my New Mexico (USDA zone 7a) house has a salt cedar (Tamarix ramosissima), which is growing like a huge bush. Its salt uptake appears to be preventing anything else in the vicinity ...
4
votes
1answer
238 views

What is causing yellow spots with 'hair growth' on the underside of the leaves on my tree?

I've slowly been bringing this tree back from some devastating summers 5 years ago where several large branches died. I've been diligent about pruning and feeding. For lack of a better description, ...
2
votes
3answers
226 views

Small Baby tree growing its roots right next to the base of my house. Should I be worried? [duplicate]

Should I pull out the tree? It stands at roughly 10 feet tall. With green colored branches. The stem of the tree is indeed brown and wooden. I have no clue how deep the roots are. Will the roots ...
4
votes
4answers
6k views

Why is my new Acer tree dying?

I recently bought a small red Acer and moved it into a more permanent pot. It's about 2 1/2 feet tall and since I've moved it, the leaves have have started to brown and shrivel like a dead leaf would ...
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vote
1answer
1k views

Why is the leaf on my avocado tree drooping? [duplicate]

I have had an indoor avocado tree for a couple of months, but it doesn't look like the pictures on Google. One leaf is almost touching the tree. The new leaves on top are fine but when others appear ...