Is My Tree Planted Too Deep?
A buried root flare is a warning sign, but the right correction depends on the tree's age, health, roots, and how far the grade has changed.
If the trunk enters the ground like a telephone pole, the tree may be too deep. CSU Extension identifies a missing root flare as a sign that the root ball was buried or soil was later added over the root system.
Deep planting matters because roots need oxygen. It can also encourage circling or girdling roots that restrict the trunk years later. But poor growth alone does not prove the cause; irrigation, compaction, drainage, species, and other stresses can produce similar symptoms.
Check both kinds of depth
A tree can be too deep in two ways: the root ball may sit too low in the hole, or the tree may already have been buried within its nursery root ball. Correct planting addresses both. CSU recommends that the root ball sit on firm, undug soil and finish slightly above grade, with no backfill placed over its top.
Gently locate the first structural roots with a slender probe a few inches from the trunk. Loose mulch is easy to correct. Several inches of soil, landscape fabric, or roots circling the trunk make the situation more complicated.
What can be fixed now
- Pull mulch back at least six inches from the trunk and keep the root flare visible.
- On a very recent planting, verify the root ball position before the tree establishes; replanting may be possible.
- Correct irrigation so exposed roots are not kept saturated or allowed to dry after excavation.
- Have embedded or load-bearing girdling roots evaluated before cutting them.
When the answer needs expertise
CSU notes that correcting established, deeply planted trees can require locating and managing circling roots below grade. Removing soil or roots changes moisture, anchorage, and trunk support. For a valuable mature tree, that is a reasonable point to involve an ISA Certified Arborist rather than attempting a large excavation with hand tools.
Sources & further reading
These Field Notes translate Colorado horticultural guidance into practical homeowner language. For the underlying recommendations, start with the original CSU Extension resources: