Plant of the Month

September 2009

 

Thalictrum rochebrunianum

Lavender-Mist Meadow Rue

 

Plant Height: 36" to 60"
Flowering Height: 48" to 72"
Spread: 24" to 36"
Type: Large Perennial Flower
Habit: Upright, clump forming

 

Bloom Color: Open, loose sprays of lavender flowers
Bloom Time: Mid July thru Early September
Light Requirements: Tolerates full sun to light shade; Prefers light, dappled sun
Soil Requirements: Grow in average, well-drained, rich, humus soil.
Water Requirements:

Grow in average to medium moisture.

Suggested Companions:

Densiformis Spreading Yew (Taxus)

Summer Wine Ninebark (Physocarpus)

Turtlehead (Chleone lyonii)

Leatherwood Fern (Dryopteris marginalis)

Monkshood (Aconitum x 'Arendsii')

Goat's Beard (Aruncus dioicus)

Globeflower species (Trollius sp.)

 

Plant Description             

A beautiful perennial that develops an ethereal, "lavender-colored mist" on top of the plant in late summer.  This elegant Japanese native boasts attractive, blue-green foliage and a floriferous display of dainty flowers lavender-purple flowers atop dark purple stems. Prominent pale yellow stamens and persistent sepals accentuate the display. Most effective in a drift, place wherever a glow of purple would be welcome.

Use these plants in a wildflower garden where they will naturalize with ease, or as filler plants at the back of the border. Plant in groups of three for greatest visual impact.

Plant Care
Allow strong stems to remain for winter interest, cut back to within 2" from the crown in early spring before the new leaves begin to push dormancy.  Divide plants in early spring or fall, approximately every four years.

 

Additional Plant Information:

Provided by Missouri Botanical Gardens Kemper Center

 

General Culture

Grow in average, medium moisture, well-drained soil in full sun to part shade. Prefers a rich, humusy soil and light, dappled sun. Intolerant of the hot and humid summers of the deep South.

 

Noteworthy Characteristics

This species of meadow rue (sometimes commonly called lavender mist meadow rue) is a slender, clump-forming perennial which features lacy, fine-textured, bluish-green, pinnately compound, columbine-like foliage (3-4 ternate). Tiny, pendulous, lavender-purple flowers with contrasting yellow stamens appear in late summer (July-September in St. Louis) in loose, airy clusters atop sturdy, purple flower stems which rise well above the foliage to 4-6' tall (infrequently to 8'). When massed, the overall effect of the bloom can be spectacular.

 

Problems

No serious insect or disease problems. Powdery mildew and rust are only occasional problems. Unlike many of the meadow rues, this species has sturdy flower stems which usually do not require staking or support.

 

Uses

A tall, airy plant which provides excellent foliage and late summer bloom to the perennial border, wildflower garden, meadow or naturalized area. Good background plant. Perhaps best when grouped.

 

 


 
     
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