6. Ox-eye Daisy – Chrysanthemum leucanthemum syn. Leucanthemum vulgare
1. Creeping Bellflower – Campanula rapunculoides
7. Orange Hawkweed – Hieracium aurantiacum
Annual, Winter Annual and Biennial Weeds
1. Dandelion – Taraxacum officinale
13. Common Burdock – Arctium minus
8. Redroot Pigweed – Amaranthus retroflexus
Yellow Narrow-leaved Hawkweed – Hieracium umbellatum
Amaranthaceae (Pigweed family)
A trailing or climbing perennial with spreading stems up to 10 feet. Leaves dark green to sometimes dark purplish, 1 to 4 inches long, often with one to several lobes or leaflets at the base. Flowers are star-shaped, having purple petals and prominent yellow or orange anthers. Fruits are bright red, egg-shaped berries, arranged in open clusters. It is a native of Europe that is widely distributed throughout much of North America. It is typically found growing in moist waste areas, in fence rows, along drainage ditches and waterways; and may form large colonies or thickets. it also becomes established in orchards, vineyards, and residential landscapes. all parts of the plant are toxic. Children seem to be especially attracted to the bright red berries, which may cause poisoning if eaten in sufficient quantity.
An annual with generally prostrate stems radiating in all directions from a central taproot. Main stems are usually 12 to 18 inches long with shorter secondary branches. All stems are somewhat fleshy and pliable, nearly smooth, and usually red to purple. Leaves are approximately 1/2 inch wide and oval, with the tip broader than the base. Flowers are in small congested clusters in the leaf axils. Long terminal flower spikes are absent. Seeds are shiny, black, lens-shaped and approximately twice the width of tumble pigweed seeds. Prostrate pigweed was possibly introduced from tropical America, adapting well to our area. It occurs mostly in disturbed or cultivated soils, and is often associated with tumble pig weed. it is a common garden weed.
The common sunflower is an annual, 1 to 10 feet tall. Stems are erect, simple to much branched and rough. Leaves alternate and are simple rough, hairy, ovate or heart-shaped, with toothed edges. The flowers are showy, with yellow to orange-yellow ray flowers and brown or dark reddish-brown disk flowers. Achenes, gray to brown, are 1/4 inch long, wedge-shaped, some what flattened to 4-angled, smooth except for a few short hairs at the tip. Native to North America, sunflowers have been cultivated since pre columbian times for its edible seeds. They are common weeds of roadsides, fence rows, fields, pastures, and waste areas. Flowering is from July to September.
Asteraceae (Sunflower family)
Hairy nightshade is an annual, 12 to 24 inches tall. Foliage is spreading, hairy, and may feel sticky when handled. Flowers resemble those of potato and tomato and have 5 white petals, and an enlarging green calyx. They are arranged in clusters. As the fruit matures, the calyx cups the lower half of the greenish or yellowish fruit. Hairy nightshade, a native to South America, is a widespread weed of waste places and cultivated fields. The plant contains toxic alkaloids, especially in the berries. hairy nightshade causes problems in field crops similar to those described for black nightshade.
A perennial, 1 to 3 feet tall, spreading by rhizomes or seeds. Stems are sparsely covered with short yellow thorns. Leaves and stems are covered with dense short hairs that five the foliage a gray or silvery appearance. Leaves are narrow, lance-shaped, with entire to wavy margins. Flowers are 3/4 to 1 inch wide with violet to light blue (sometimes white) petals. The mature fruit is ayellow or dull orange berry, which may eventually turn blackish. Silverleaf nightshade is native to the central United States, but has spread to other areas where it is found on rangeland, in pastures, waste areas, and cropland. The berries and foliage are poisonous to livestock.
If you’ve made it outside on a recent sunny day, you’ve probably noticed the abundance of flowers blooming in gardens, parks, forests, and throughout King County right now. Unfortunately, the noxious weeds are out there, too—many of them bolting, flowering, and even going to seed already.
First up, weeds already going to seed or getting close. Catch them now before seeds disperse!
Many garlic mustard plants in King County are going to seed. Note the long, skinny seed pods on this one.
1. Top priority: eradicate before seeds disperse
Below are some of the top regulated noxious weeds to keep an eye out for this month. Please let us know if you see one of these high-priority invasive plants, so we can make sure they’re controlled or eradicated in time! [Click here to go to the King County Noxious Weed List for the whole list!] Report locations and share photos with us easily on our new and improved Report a Weed online form.