Gardening

Yellow Loosestrife: Five-Petaled, Primrose-Like, Bright Yellow Blooms June to September

Yellow Loosestrife

Photo Compliments of Admiral Halsey

Lysimachia vulgaris, or yellow loosestrife is a rhizomatous perennial that grows to 3 to 4 feet high (in ideal conditions 6 feet tall) on stiff upright stems clad with ovate to lance-shaped leaves. Foliage is opposite or in whorls of 3 to 5, medium green leaves (about 4 inches in length and 1 inch in width) which are dotted with black to orange oil glands. It is native primarily to wetland areas.

Flowers are cup-shaped, five-petaled, primrose-like, and bright yellow (about 1 inch across) that bloom primarily in terminal panicles from June to September on soft hairy stems. Each flower has 5 yellow petals with a reddish brown area near the petal base. Flowers are followed by ¼ inch wide seed capsules that split open when ripe.

You find yellow loosestrife growing naturally in damp habitats including marshlands, wet woods, in the margins of ponds and lake areas, stream banks, ditches, and along roadsides in and the northern parts of the U. S.

Note: Some states have classified this plant as invasive so choose locations carefully.

How To Make Your Yellow Loosestrife Thrive

This plant is easily grown in humusy, moist to wet, well-drained soils in full sun to part shade. The preference is some part afternoon shade in hot summer climates. This is an aggressive perennial of wetland areas which can spread invasively by creeping rhizomes and self-seeding to form large colonies which can displace native vegetation and disrupt habitat needed by certain types of waterfowl and fish.

Note: Eradication of the underground rhizomatous network present in established plant colonies can be difficult.

General Yellow Loosesrife Information

Pests and Diseases

There are no serious insect or disease problems. Lysimachia vulgaris is susceptible to rust and leaf spots. Plants should be closely monitored to avoid unwanted spread in the landscape.

Propagation

Yellow loosestrife plants should be divided every 2 or 3 years in the spring or fall to control spread-growth.

Garden Uses

This plant should not be grown in areas where it is expected to spread invasively. It is best located in moist areas separated from other valued perennials where it can be allowed to naturalize into colonies.

Yellow Loosesrife should be grown in cottage gardens, wild gardens, remote parts of borders, bogs, pond peripheries, or along streams.

Quick Facts

  • Family: Primulaceae
  • Common Name: Yellow loosestrife
  • Plant Type: Herbaceous perennial
  • Hardiness Zones: Zones 4 to 8
  • Height: 3 to 4 feet commonly, in ideal conditions up to 6 feet
  • Spread: 3 to 6 feet
  • Bloom Time: June to September
  • Bloom Color: Yellow flowers with reddish-brown centers
  • Sun: Full sun to part shade
  • Water: Medium to wet
  • Maintenance: Medium
  • Tolerates: Wet Soil

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6 Comments

  1. I didn’t know it came in yellow

  2. Purple loosestrife is invasive in a few scattered areas in Alabama and is on our watch list. There is no mention of the yellow variety. It is very pretty!

  3. These are so beautiful!!
    Maniparna Sengupta Majumder recently posted..An interesting and beautiful blog!My Profile

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