When it comes to caring for our trees, many of us rely on information passed down to us from our family or friends. The problem with this is that many times this information can be wrong and many do not find out until it is too late. So what are some common beliefs about trees that aren't true?

COMMON BELIEF #1: Securely stake your new tree when planting it so that it develops stable root system and strong trunk.  Staking trees can be necessary at times just to keep them upright and to let them get established when first planted, but professionals have discovered that unstaked trees tend to develop a more extensive root system and better trunk taper than those that are staked. Allowing a small amount of movement can help root and trunk development. Of course, the worst effect of staking is the possibility of trunk damage from the staking wires or ties. Staking materials usually should be removed after one year to avoid "girdling" the tree.

COMMON BELIEF #2: You should wrap your tree trunks to prevent insect entry or sunscald. Generations of people have been wrapping their tree trunks for years, sometimes with kraft paper.  Studies using most common tree wraps have shown that they do not prevent extreme fluctuations in temperature on the bark. In some cases, the temperature extremes are worse. Also, tree wraps have proven quite ineffective in preventing insect entry. In fact, some insects like to burrow under it. If you feel an absolute need to protect your thinbarked trees, such as ash, birch, linden or maple, a loose fitting tree guard in a light-reflective color would be better than a trunk wrap. 

As with tree staking, trunk guards should be inspected periodically to make sure they aren’t restricting the trunk.  Most guards can be removed six to twelve months after the tree is planted.  Always remove wraps that come with a new tree.  It was there to protect the bark during transport.

COMMON BELIEF #3: Pruning trees heavily compensates for the loss of roots. Although pruning the top can reduce the amount of water that evaporates from the leaves, the tree needs a full crown to produce the much-needed food and the plant hormones that induce root growth. The tree will develop a stronger, more extensive root system if it has a fuller crown. Limit pruning at the time of planting to structural training and the removal of damaged branches.

COMMON BELIEF #4: When removing a branch from a tree, the final cut should be flush with the stem to optimize healing. The old practice of pruning tree branches was to cut flush with the tree trunk. When this is done the ability of the tree to stop decay is greatly decreased. Flush-cut pruning cuts into the wood of the trunk cause a wound that can allow decay organisms to infect the main trunk of the tree. The current recommendation is to prune the branch to just outside the collar. Properly pruned branches will have a circular closure around the wound. When the branch is cut too close to the trunk, the closure will be oval or distorted.

COMMON BELIEF #5: After pruning, wounds should be dressed or painted. Research has shown that painting wounds does not prevent wood decay behind the pruning cut and may even increase the amount of wood rot by keeping the environment moist and dark.  It's better to keep the wound open to air and light.  Sometimes pruning paints are applied for cosmetic purposes.  When this is done, they should only be applied in a thin coat.

COMMON BELIEF #6: Certain fast-growing, weak-wooded trees such as silver maple and Siberian elm should be "topped" to make them less hazardous in the landscape. While topping these trees may reduce the potential hazard at first, they will likely be more dangerous in the future. Topping starves a tree by reducing the amount of leaf surface and thereby reducing the tree’s ability to manufacture food for root growth, tree health, and tree vigor. Topping also stimulates growth of twigs below the cuts. Within 2-5 years after topping a tree, it will regain its height but with weaker limbs.

COMMON BELIEF #7: If certain species of trees are pruned early in the spring, they will "bleed," stressing the tree and causing health problems. True, some trees such as maples and birches will "bleed" or lose sap from pruning cuts made early in the spring. This bleeding does not hurt the tree, and the loss of sap is inconsequential. With a few exceptions, most routine pruning can be done anytime of year. The worst time is just as the tree has leafed out in the spring. The best time is when the tree is dormant. To maximize flowering for the following year, prune just after bloom this year.

COMMON BELIEF #8: The root system of a tree is a mirror image of the top. Many people envision a large, branching taproot growing deep into the soil. Actually, taproots are very uncommon in mature trees. If taproots do develop, they usually will be forced into horizontal growth when they encounter hard subsoils beneath the surface. The entire root systems of most trees can be found within three feet of soil. The spread of the root system however, can be very extensive, often extending 2-3 times the spread of the crown.