Here are five of the most invasive Central Oregon weeds to get you started:
What are invasive weeds?
Invasive weeds are plants that grow, spread aggressively, and will out-compete and cause harm to native vegetation, destroy natural animal habitat, and compete for scarce water resources. Use this weed guide to help identify our area’s worst weeds. Then, join us in preventing, controlling, and reducing invasives as you care for your own piece of Central Oregon.
Hand pulling or hoeing before seeds are produced will reduce infestation.
Salsify ( Tragopogon dubius):
This invasive weed is also known as goat’s beard. Salsify have yellow flowers that open in the morning light and close in the afternoon sun. Their seed heads resemble over-sized dandelions. Hand pull before they’ve gone to seed.
Youngia japonica is a warm season annual that can be identified by the flowering stalks that branch from the uppermost part of the plant. Flowers are yellow to orange-yellow with five tiny teeth at the end of the outermost petals. Asiatic Hawksbeard can be found in Pennsylvania, south through Florida and west into Louisiana.
Dichondra carolinensis is a creeping, prostrate perennial that roots at the nodes. Dichondra leaves are light pale green and are sparsely hairy. Leaves are nearly round to kidney-shaped. Dichondra occurs in moist turf and woods and can be found from Virginia to Texas.
Carolina False Dandelion
Murdannia nudiflora is a summer annual identified by its fleshy, narrow lance-shaped leaves as well as its stems that root at nodes. Doveweed is also identified by short leaf sheaths with short hairs on the upper margins. Doveweed usually germinates later in the growing season than other summer annuals and can be found from Virginia, into Georgia, through Florida and west into Texas.
Oxalis stricta is a herbaceous perennial found in warmer climates and annual in cooler areas. Yellow Woodsorrel is identified by its green to yellow-green, alternating leaves, divided into three partly-folded, lobes appearing heart-shaped. It can be found in most of the Eastern and Central United States.
Desmodium canum is a perennial which grows from a large taproot with long, extensively branched hairy runners rooting at nodes. Leaves maintain a trifoliate appearance that varies in size with an elliptic shape including a pointed tip. Creeping Beggarweed is found throughout Florida and in southern Texas.