Hello,

It’s sad to see a tree like your linden begin to fail. Lindens (Tilia americana) have few problems. Read more here: https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=a917

However, environmental conditions may affect it. In this case, when you have two trees planted at the same time in similar conditions and one begins to fail, the problem may lead back to the original planting. Were the roots compromised when it was first planted or was the soil in this spot contaminated after planting? A soil test may help analyze the problem. To obtain a soil test kit go to: https://homesoiltest.msu.edu/get-started

Die-back of the tree canopy may indicate that the tree has girdling roots or the tree was planted too deep—it should be planted where the tree flare enters the soil--which is hard to see from the photo. Both situations would impede the flow of nutrients to the canopy.

A certified arborist will be able to assess the tree and determine the condition of the roots. To find a certified arborist in your area go to: www.treesaregood.org , the website of the International Society of Arboriculture.

Thank you for contacting Ask Extension.