16 votes
Accepted

Is this heavy blue-green growth on my tree trunk and branches a form of lichen?

These look like the tree lichens that are growing on my own trees. A lichen is a composite organism where by a fungus lives together with an algae in a symbiotic relationship. They don't hurt the tree,...
14 votes
Accepted

Should trees be staked when they are planted?

Should all trees be staked when they are planted? First, you have to find out Why people stake trees. What benefits are there to staking young trees? In nature, trees can germinate, grow, and mature ...
  • 51.5k
10 votes

How can I help my young mulberry tree grow a thicker stem?

Etiolation, or insufficient light strength, is a partial explanation - this tree is deciduous and normally would be dormant at this time of year. However, the process of thigmomorphogenesis is also ...
  • 130k
10 votes
Accepted

Dwarf Apple tree in heavy clay

Apple trees do well in clay. There are a few things you could do different next time: do not put stones or other soil amendments in the bottom of the hole. If the planting hole has reached the clay ...
  • 56.6k
10 votes

How should I save an oak tree wounded by ground root removal?

I had a large (massive) Elm tree that had all the roots on one side cut about 6 feet from the tree due to an idiot plumber running a sewer pipe. This was a deep trench, too. I used an in-ground ...
  • 101
10 votes
Accepted

How should I care for a young cherry tree?

When you say 'recent', if that means within the last year, the only thing you need to do is keep it well watered during dry spells for its first 2-3 years. Hopefully you dug the soil over well and ...
  • 130k
10 votes

Any way to save a large tree that's starting to split/crack down the middle?

Consult a tree surgeon. If you want to save it, it might be possible to cable the top parts (not "tie a rope around") to keep it from spreading wider. Depending on the decay of the trunk, this might ...
  • 19.3k
10 votes

Pruning a weeping mulberry

Oh my goodness. Do you understand the treasure you have? Find a master pruner to create a covered walkway! How wonderful. If you destroy this tree I will haunt you when I am dead! (Grins). That ...
  • 39.9k
10 votes

Very few needles on lower spruce branches

I live in a region where Norway spruce grows wild, and in my experience, the lower shaded branches shedding their needles and dying is perfectly normal for these trees. For the tree, there's no point ...
9 votes
Accepted

How should I care for my multi-variety apple and pear trees?

You definitely need to do some pruning. Before you start pruning a tree, you should find all of the graft points. Since you have multi-graft trees, there should be one graft at the point where each ...
  • 9,424
9 votes

Is this heavy blue-green growth on my tree trunk and branches a form of lichen?

As Graham says they are lichen and moss. A tree will commonly live in a symbiotic relationship with millions of macro and micro-scopic organisms. In tropical and temperate rain forests overgrowth on ...
  • 56.6k
9 votes

Any way to save a large tree that's starting to split/crack down the middle?

Yes, a professional arborist could save the tree using cabling and bolts as the practical Ecnerwal illustrates. This would be something you would do as soon as possible. It appears that the two ...
  • 56.6k
9 votes
Accepted

Does moss harm the tree it grows on?

Moss will not harm the tree! Good news indeed because the forests around here would be in BIG trouble! Moss does not have true roots - their "roots" are just for the purpose anchoring themselves to ...
  • 1,699
8 votes

Can I save this tree?

First of all, I'm going to explain a bit about what's probably happening. Peach trees, and for that matter most stone-fruit trees planted for production, are usually not grown on their own roots. If ...
  • 5,839
8 votes
Accepted

What are the best practices for keeping trees healthy in a construction area?

This answer will be based on a tool from the University of Georgia Cooperative Extension Service Forest Resources Unit. I have changed it somewhat over the time I've used it, but I was sure to make it ...
  • 51.5k
8 votes

What do nurseries feed their potted trees to make them so healthy?

Bear in mind that many commercial outlets do not actually grow trees in pots, they simply buy them in from a specialist supplier. The actual supplier will raise the saplings under controlled ...
  • 130k
8 votes

Harm a tree by trimming top/exposed only part of root in lawn?

Evil Elf asked in a comment about studies of what does happen to trees when root work is done. A survey of web links shows that root pruning is commonly given as good advice. Academic studies of the ...
  • 56.6k
8 votes
Accepted

Is this rule of thumb for timing dormant pruning correct?

I think the grouping would look more logical if it were made on the way the trees set fruit: stone fruit trees (plum, apricot) are the early bloomers, while the trees with fruits that contain seeds (...
  • 5,366
8 votes
Accepted

Should I redo this pruning cut?

The cut is fine but the tree has or will have issues. You can see that there is already interior decay in the heartwood of the tree. As stormy indicates water will enter the wound and decay will ...
  • 56.6k
8 votes

Should I leave fallen apples (windfall) to rot under the tree?

According to this publication from the University of Wisconsin Extension, the larvae of several destructive insects can grow to maturity in windfallen apples: Apple Maggot Flies (pp. 12, 14) Codling ...
  • 14.5k
7 votes

How can I revive a tree that's been stripped of bark?

Bridge grafting may be the technique you're looking for. This method uses smaller stems to bridge the gap, allowing sap to flow across. Image credit found here, with directions on how to use this ...
7 votes
Accepted

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

I've found that trees can put up with a lot. Oak trees are seldom affected by galls unless there is a heavy infestation. Galls on the leaves are not a worry, and oak trees will tolerate them quite ...
  • 51.5k
7 votes
Accepted

Bay Leaf Tree (Laurus Nobilis) with severe scale

The problem with a large tree like this is that trying to spray it requires professional equipment. Even with a pressurized sprayer you will get whatever you are spraying drifting onto to neighbors ...
  • 56.6k
7 votes

Can citrus tree health affect the seed count in the fruit?

The seediness of Clementine mandarins depends upon the availability of pollen from other citrus varieties when the tree is in bloom. Clementines are typically low seeded or seedless when grown in a ...
7 votes

How can I help my young mulberry tree grow a thicker stem?

That is etiolation. Here's a ginger plant with the same issue. Your tree wants full sun. This tree would prefer to be grown outdoors in the sun. Of course, if it's freezing out right now, I'd wait ...
  • 51.5k
7 votes

What do nurseries feed their potted trees to make them so healthy?

I'm pretty sure they don't give them anything initially, although if the tree does not sell within a few months, I imagine they would give them slow release fertiliser appropriate to the plant - ...
  • 3,396
7 votes

How can I protect my plants from cows and goats?

You need to build a fence, or a wall.
  • 19.3k
7 votes

How can I protect my plants from cows and goats?

You will have some difficulty (at least from goats). There are a few solutions I'm aware of - Kill the goat(s) - Its the only way to be sure. Put goats on a chain or in a run (arguably more cruel ...
  • 3,396

Only top scored, non community-wiki answers of a minimum length are eligible