Central Ohio Invasive WatchUpper Scioto · 17 Counties

A volunteer field guide

Watching the woods and waterways of Central Ohio.

Plain-language notes on the invasive plants spreading across the Upper Scioto watershed, and the native species worth planting instead. Written by and for the people who steward this ground.

This season's focus
Amur honeysuckle pulls easiest after the first hard frost, when native shrubs have dropped their leaves and the honeysuckle hasn't. Late November is prime along the Olentangy.

Latest Field Notes

Species Profile · Updated June 2026

Callery Pear: the tree Ohio finally banned

Illegal to plant here since 2023, yet still spreading down every fencerow from Delaware County to Circleville. How to spot it, why birds keep moving it, and what to plant in its place.

Species Profile · Updated June 2026

Amur honeysuckle: identification and removal

The single most common invasive shrub in our woods. How to know it, when to cut it, herbicide-free options, and the native shrubs that fill the gap.

Species Profile · Updated June 2026

Japanese knotweed and the myth of the quick fix

No, cutting it down won't kill it. What knotweed is doing underground, why it favors the Olentangy and Scioto banks, and the multi-season approach that works.

Species Profile · Updated June 2026

Tree-of-heaven: why cutting it makes it worse

How to tell it from native sumac, why a cut stump sends up a dozen shoots, and the control approach that actually reaches the roots. Plus its link to the spotted lanternfly.

Species Profile · Updated June 2026

Lesser celandine: the deceptive spring invader

Bright yellow and easy to mistake for a native, it carpets floodplain woods before the spring wildflowers wake up. How to tell it from marsh marigold, and the narrow window to act.

Species Profile · Updated June 2026

Winter creeper: the evergreen that climbs

Green all winter, it smothers the forest floor and girdles saplings while everything native is dormant. Identification and the two-front removal it takes.

How-To · June 2026

Garlic mustard: how to pull it right

First-year rosettes versus second-year bloom, why spring is the only window that matters, and why you bag it instead of composting it.

Planting Guide · June 2026

Native trees for Central Ohio yards

Eight native trees that make good yard and street trees and replace Callery pear, from serviceberry and redbud to swamp white oak and hackberry.

Planting Guide · June 2026

Native plants for streambanks

Deep-rooted natives that hold an eroding bank on the Olentangy or Scioto, especially after clearing knotweed. Trees, shrubs, and grasses by site condition.

Browse the full species watchlist →