You are here:

Trees/pin oak high upper limbs dead


I  am in Lancaster PA soil has high limestone content I just read that the mulch around pin oak tree can also be reason for the tree dying, I am removing the mulch< Question: can I do anything else to save this tree????

I do not think it is the mulch. It likes acidic soils, and does not tolerate limestone or shade very well. Mulch like pine straw will raise the acidity of the soil. Soil that is naturally high in lime, or calcium carbonate, is called calcareous soil, and it often has a pH above 7.5. A pin oak planted in calcareous soil is highly susceptible to iron chlorosis.  Although ways exist to lower soil pH so a pin oak can receive iron oxide more effectively, lowering the pH is impractical if not impossible if the soil contains lime. The pH of soil that doesn't contain lime usually can be lowered by adding sulfur. Commercial products containing both sulfur to lower pH and soluble iron to correct iron deficiency are available.

Iron chelates, chemicals that bind with iron, can help increase iron's availability to pin oak roots. Typically, iron chelates are placed in holes 6 inches deep and at least 1 1/2 inches wide. The holes are spaced 1 foot apart around the tree in two to five concentric rings; the number of rings depends on the tree's size. Iron chelates or chelates containing iron and sulfur also can be sprayed on a pin oak's leaves, but covering all of a large tree's leaves is difficult, and the result may be only temporary.


All Answers

Answers by Expert:

Ask Experts


Jim Hyland


I am an expert in Forestry, Forest Entomology, Forest Pest Control, and Forest Health. Extensive knowledge in Identification of insects and diseases of trees. Expert on Bark beetles and other insects that attack forests. Also a Registrated Forester with extensive knowledge in the management and care of forests.


34 years as State Pest Management Chief in a Southern state. Extensive knowledge in Forestry.

BS with major in Forest Management and Entomology
Registered Forester
Certified Pesticide Appicator

©2017 All rights reserved.