Hello,

FYI: My plant ID app identified this conifer as a European larch (Larix decidua)

The European larch (Larix decidua) is an unusual conifer that drops all its leaves each autumn, unlike evergreen conifers. Here are some possible reasons why your larch might have ceased growing along the arch:

Environmental Factors:

Soil Conditions: Larches prefer well-drained soils. Wet or compacted soil can hinder growth. You might want to get a soil test done. Details on soil testing at this link: Get Started | MSU Soil Test

Sunlight: Ensure the tree receives full sun. Lack of sunlight can slow growth.

Watering: Consistent watering during dry periods is essential for healthy growth.

Age and Habit:

As larches mature, their uniform habit changes. Older trees may exhibit irregular growth patterns. More information at this link:

European Larch, Larix decidua – Wisconsin Horticulture

Health Issues:

Pests and Diseases: Check for signs of pests (e.g., aphids, sawflies) or diseases (e.g., cankers, rusts). Address any issues promptly.

Root Health: Inspect the roots for damage or rot. Healthy roots are crucial for growth.

Pruning and Training:

If the arch restricts growth, consider pruning to allow more space.

Proper training when young can prevent growth issues later.

Climate and Elevation:

Larches grow at high altitudes in their native range. Consider local climate and elevation. More information is at this link:

(PDF) Phenology of wood formation in larch (Larix decidua Mill.) trees growing along a 1000-m elevation gradient in the French Southern Alps | Cyrille Rathgeber - Academia.edu

Option 1: I recommend you send all your images by e-mail to the MSU Plant & Pest Diagnostics Lab for a confirm and precise identification. The experts there can also provide you with the best treatment options. Their email is <personal data hidden> - Please include your name – The lab will let you know if they need a sample sent. FYI – The lab may also ask for additional images too.

Their website is at this link:

Plant & Pest Diagnostics (msu.edu)

Their Contact Information is at this link:

Contact Us - Plant & Pest Diagnostics (msu.edu)

This link will explain the details on submitting a sample to MSU Plant & Pest Diagnostics Lab:

Submit Samples - Plant & Pest Diagnostics (msu.edu)

Second Option: Remember that each tree is unique, so a site-specific assessment by an arborist may provide more insights. Consider consulting with an arborist for personalized advice. To find an arborist in your Zip Code go to this link:

Find an Arborist (treesaregood.org)

I hope this helps!