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Calamagrostis – Karl Foerster – Feather Reed Grass – Calamagrostis acutiflora

Garden Height
48 - 72
Spacing
24 - 36
Spread
24 - 36
Habit
Upright
Container Role
Thriller
Flower Size
Tall
Flower Colors
Green
Light Level
Part Sun to Sun
Proven Selections

2001 Perennial Plant of the Year

Features

2001 Perennial Plant of the Year

Attracts: Birds

Award Winner

Dead-Heading Not Necessary

Grass

Heat Tolerant

Maintenance Notes

Karl Foerster is cool-season grass. Cool-season grasses put on most of their growth in spring before temperatures begin exceeding 75 degrees Fahrenheit and in the fall when temperatures cool down. They generally maintain good color through the summer but won't grow much when it is hot.
Cut back cool season grasses in very early spring.

Cool season grasses tend to look good even as the weather cools. Leave their foliage in place until spring and then as soon as the snow is gone cut them back. Leave about 1/3 of the plant in place. Trimming cool season grasses too harshly can irreparably harm the plant.

Divide cool season grasses in spring or early fall. Cool season grasses are actively growing in spring and fall. These grasses can be transplanted at either time of the year but early spring is probably the best time to divide. If you do divide them in the fall, be careful that the freeze/thaw cycles of winter don't heave the plants out of the ground, this happened to a couple of my coral bells last winter.

Cut clumps of grass to the ground in late winter before new shoots appear.

Uses Notes

Great for landscapes and as a specimen plant

Maintenance Category Easy

Water Category Average

Bloom Time

Flower Form Cut Flower, Dried Flower, Grass, Landscape

pH B - pH 5.8 - 6.2

EC (2:1 Extraction Method) 0.6 - 0.9

Fertilization 100 - 150

Light Requirements Medium

Water Requirements Moderate to Moist

Rooting Out Temperature 65 - 72° Fahrenheit

Growing On Temperature 65 - 72° Fahrenheit

Holding Temperature 40 - 50° Fahrenheit

Planting and Timing Information

Early Spring to Summer Finish. Standard PPP.

Finishing Times [weeks]
4-5" and Quart Pot : 4-6
6" and Gallon Pot : 5-7
7-9" Pot :
10-12" and Two Gallon Pot :

Pinching and Growth Regulators

Plugs may be trimmed slightly at transplanting. Early application of Sumagic, 2 ppm drench at 4 oz. per pot 1 week after transplant.

Pest and Disease Management

No apparent pest or disease problems. General pest and disease practices as listed in notes.

Grower Tips

Upright Divergent.