Plant Problem Diagnostic
Tree Suckers and Water Sprouts
The short answer
Water sprouts are vigorous, weakly attached shoots that grow straight up from a tree's trunk or branches; suckers are similar shoots that come from the roots or the base of the trunk. Both grow from dormant buds in the bark.
They usually appear after stress or injury: heavy or improper pruning (including topping), storm or root damage, soil compaction, drought, mower and string-trimmer wounds at the base, or disease. Heavy pruning in particular wakes up dormant buds and triggers more sprouting.
Extension sources recommend removing suckers and water sprouts, ideally as soon as they appear, because they crowd the canopy, divert energy, spoil the tree's shape, and create weak, breakable growth. Rub or twist off soft young ones in spring; cut larger ones cleanly at their base. Fixing the underlying stress is what actually stops them returning.
What they are and why they appear
The University of Maryland Extension distinguishes the two: water sprouts are shoots that develop on the trunk and branches of a tree, while suckers grow from the roots or the base of the tree. Both arise from dormant buds under the bark that a tree keeps in reserve and activates when something goes wrong.
The University of New Hampshire Extension explains the common triggers: stress or injury such as storm damage, root loss, soil compaction, topping, disease, over-pruning, or drought. Crucially, heavy pruning itself is a trigger, because removing large branches stimulates those dormant buds, so the more aggressively a tree is cut, the more sprouts it tends to throw. Suckering from the base is often a sign of injury there, for example repeated hits from a mower or string trimmer.
Remove them, and time it right
Both Maryland and New Hampshire Extension recommend removing water sprouts and suckers rather than leaving them, because they crowd the canopy, reduce flowering and fruiting, divert energy from the rest of the tree, weaken its structure against wind and ice, and look untidy. On grafted trees especially, suckers from below the graft can overtake the desirable variety if left.
Timing makes the job easy. New Hampshire Extension notes that soft young sprouts can often just be rubbed or twisted off in spring as they start to expand, which discourages regrowth better than cutting. Once they reach pencil thickness, cut them with clean, sharp pruners at their point of origin. Expect to repeat this: once a tree starts sprouting it often continues, so plan on removing new ones each year.
Fix the cause so they stop
Cutting sprouts off treats the symptom. New Hampshire Extension stresses that determining the cause of the sprouting and correcting it is the key to keeping water sprouts from returning. If the trigger was topping or over-pruning, prune more conservatively going forward and never top. If it was mower or trimmer damage to the trunk base, ring the tree with a mulch bed so equipment stays away.
If the stress was drought, root loss, or compaction, address the tree's growing conditions: water deeply during dry spells, avoid piling soil or driving over the root zone, and mulch to protect the roots. A tree that is not under stress produces far fewer sprouts to begin with.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- University of Maryland Extension - Water Sprouts or Suckers on Trees — Water sprouts develop on the trunk and branches, while suckers grow from the roots or base of a tree; both grow from dormant buds and are best removed because they crowd the canopy, reduce flowering and fruiting, and weaken tree structure.
- University of New Hampshire Extension - Can water sprouts and suckers be prevented on trees? — Water sprouts occur due to stress or injury (storm damage, root loss, soil compaction, topping, disease, over-pruning, drought), and heavy pruning stimulates dormant buds into more sprouting; remove them as soon as produced, rubbing or twisting off soft young ones in spring, and fix the underlying cause to keep them from returning.