Tree care in Sioux Falls
Sioux Falls trees face an invasive insect that kills ash trees, severe summer windstorms and heavy winter snow and ice. Caring for them means planning for all three.
Emerald ash borer
South Dakota keeps an internal emerald ash borer quarantine that covers all of Minnehaha and Lincoln counties, along with several neighboring counties. The quarantine was first put in place in May 2018 and has been amended several times since. Emerald ash borer kills ash trees, and infested trees become brittle and dangerous as they die. If you have ash trees, ask an arborist whether treatment makes sense for a healthy, valuable tree, or whether planned removal and replacement is the better choice. The quarantine restricts moving ash wood and firewood; ask the tree company how they'll handle and dispose of ash wood.
Storm damage
On the night of September 10–11, 2019, straight-line winds of 80 to 100 mph caused considerable tree damage, and three brief EF-2 tornadoes touched down within Sioux Falls. During the May 12, 2022 derecho, straight-line winds of 50 to 70 mph were widespread, with gusts measured at 97 mph in Madison, South Dakota. Trees with dead limbs, decay, cracks or weak forks are the ones that fail. Have an arborist look at large trees near the house before storm season.
Snow and ice
NOAA's engineering weather data for Sioux Falls lists a 50-year ground snow load of 40 pounds per square foot and about 75 freeze-thaw cycles a year. Heavy snow and ice load limbs, especially on evergreens and trees that still have leaves in an early storm. Pruning to remove weak and overextended limbs reduces breakage.
Pruning
Good pruning thins and shapes without stripping. Topping weakens trees and invites decay. Late winter, when trees are dormant, is a common time for pruning many species; ask the arborist about timing for your trees.
After a storm
Stay away from downed power lines and call your power company. For trees on your house, call your insurer, then a tree company. Get a written price before work starts, even in an emergency, and be wary of door-to-door crews asking for payment up front.
Before you hire
Ask for proof of liability and workers' compensation insurance. Ask for a written estimate that names each tree, the work, stump grinding, and whether wood and debris will be hauled away. Ask whether climbers use spikes; they shouldn't on trees you're keeping.