Thalictrum flavum ssp. glaucum

Beautifully designed and informative site. Had no idea there were that many species of the plant. Could you possible go into greater detail regarding seed starting and exactly how you saved the seed. What does “Baggy” mean in relation to the temperatures you saved the seeds at. I have a Yellow Meadow Rue planted in full sun. In the almost 13 years I’ve owned it, it has never reseeded. This year I tried to saw off a small shaft off the end of the plant hoping to divide it. It has almost always flopped, save for the first few years when it was shorter in height and girth. Now thee plant seems to have really suffered since my shaving off the tiny shoot section and for some reason is resembling an over grown clump of tightly packed Iris that desperately need to be split: growth around the root edges, yet no shoots from the center of the plant. The tiny section I lopped off was at the very edge of the plant and about 1/2″ big. The mother clump is probably close to 1′ or larger in circumference. It is one of the few plants I purchased when I started my garden that has always thrived and not been knocked out by the extreme swings in weather we’ve had in the mid atlantic the past 8 or so years, or workman painting and doing roof repairs. It’s also my favorite. We did have a very cold winter and more snow than we usually have last winter. Any advice on why the center of the stalks appears to not be producing shoots would be greatly appreciated, as would a dummies guide on exactly how to save the seed. I really would like to have some seedlings. When did you gather the seed, what did you save it in and how did you expose it to cold and heat again. Thanks so much.
Starting seeds in baggies is described on my baggies page. In my experience, T. flavum doesn’t set as much seed as other thalictrums, and it can be a challenge to find the seeds among the seedheads. Slicing off part of the plant should not have hurt it – perhaps it is just in need of a bigger overhaul (more radical division), or is getting shaded in its current location. I find that these thalictrums are easy to divide, although dividing such a large clump will likely take some time and muscle. Good luck!

Thalictrum Species, False Rhubarb, Yellow Meadow Rue



Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Light Shade



Foliage Color:



36-48 in. (90-120 cm)


24-36 in. (60-90 cm)


USDA Zone 4a: to -34.4 °C (-30 °F)

USDA Zone 4b: to -31.6 °C (-25 °F)

USDA Zone 5a: to -28.8 °C (-20 °F)

USDA Zone 5b: to -26.1 °C (-15 °F)

USDA Zone 6a: to -23.3 °C (-10 °F)

USDA Zone 6b: to -20.5 °C (-5 °F)

USDA Zone 7a: to -17.7 °C (0 °F)

USDA Zone 7b: to -14.9 °C (5 °F)

USDA Zone 8a: to -12.2 °C (10 °F)

USDA Zone 8b: to -9.4 °C (15 °F)

USDA Zone 9a: to -6.6 °C (20 °F)

USDA Zone 9b: to -3.8 °C (25 °F)

Where to Grow:

Unknown – Tell us


Unknown – Tell us

Bloom Color:

Bright Yellow

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown – Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer

Other details:

Unknown – Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

By dividing the rootball

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

From seed; stratify if sowing indoors

Seed Collecting:

Unknown – Tell us


This plant has been said to grow in the following regions:

Clayton, California

Oak View, California

San Leandro, California

Chadwick, Illinois

Royal Oak, Michigan

Eveleth, Minnesota

Saint Paul, Minnesota

Moorestown, New Jersey

Buffalo, New York

Naples, New York

Salem, Oregon

Pottstown, Pennsylvania

Wilkes Barre, Pennsylvania

Desoto, Texas

Kalama, Washington

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