Weed ID

ST. JOHNSWORT

Clusiaceae or St. Johnswort Family
Hypericum perforatum

GROWTH HABIT: Perennial, erect, numerous branches.

LEAVES: Opposite, attached directly to stem approximately 1 inch long, transparent dots.

STEMS: Woody at the base, 1 to 3 feet tall, rust colored with 2 ridges. Turns reddish brown and dies in late summer.

FLOWERS: Yellow, 3/4 inch in diameter, clustered.

ROOTS: Woody taproot can penetrate the soil to a depth of 4 to 5 feet. Lateral roots grow 2 to 3 inches beneath the soil surface and extend 3 feet.

SEEDS: Produces between 15,000 and 33,000 seeds annually. Viability ranges from 6 to 10 years.

REPRODUCES: Vegetative buds from lateral roots and from seeds.

HABITAT: Low elevational sites where the annual precipitation is between 15 and 30 inches.

"This one is really depressing"