· Site selection
· Types of birch
· Birch leafminer
· Bronze birch borer
· Oystershell Scale
Improving your soil should be a priority when thinking of your birch tree's health. Mycorrhizal fungi is a wonderful and beneficial addition to your soil.
Fertilization is also important. You may have heard that you can simply use the same fertilizer you use on your lawn. That is not the case. Lawn fertilizers tend to have a large proportion of Nitrogen which does promote growth, but at the expense of other developmental areas. Too much nitrogen will also burn out the soil over time. You should ensure that you use a fertilizer suited to birch trees that will promote root development, disease resistance and long-term soil health.
For more information on how to obtain a fertilizer recommended for birch trees, click here.
Depending on the soil in the local area, it is possible for Birch trees to show signs of iron deficiency. The most common symptoms of iron deficiency are seen on the younger, newly formed leaves, which appear pale green or yellow. When you examine the leave you can see a distinct skeleton pattern on the leaf surface because the veins in the leaf remain green but the soft tissue of the leaf is yellow or pale green. In extreme cases of iron deficiency, the new leaves are all yellow, smaller in size or completely stunted.
Trees often suffer from iron deficiencies, as well as deficiencies of other micronutrients such as copper, zinc and manganese. The deficiencies can occur when the nutrients are depleted in the soil or when the ph level is very alkaline, meaning over a reading of about 7.0. At ph levels over 7.0, trees have a difficult time utilizing key nutrients such as iron. Excessive use of lime or the leaching of lime from gravel, cement and bricks can cause the alkaline soil condition. This is a very common situation where recent construction has occurred or new patio stones have been installed. Alkaline soils are also common in geographical regions where limestone is prevalent and rainfall is low.
It is easy to correct an iron deficiency. Simply place chelated iron tablets in the soil at the tree’s drip-line. The iron tablets will slowly release iron and adjust the ph level so that the tree can absorb and utilize the newly replenished iron.
Aside from soil improvement, access to adequate moisture
is critical for a healthy birches. During dry periods, particularly
in the spring, birches will need watering. An effective
method is by arranging a dripper hose upside down around the tree's drip
line and watering continuously for between six and ten hours. This
should ensure adequate moisture to a depth of between 1.5 and three
feet. In areas suffering from drought or municipal watering restrictions,
a helpful way to maintain moisture around a tree’s root zone is by using
Hydretain Root Zone Moisture Manager.
Hydretain is a blend of hydroscopic and humectant compounds that attract and hold moisture, like
tiny “water magnets” within the soil. Each application reduces the frequency of watering for up to
3 months and is a helpful tool for tree care during prolonged hot, dry conditions and to improve transplant
survival. Watering frequency should decrease in the fall to allow the
tree to prepare for winter.
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