Big Bluestem (Andropogon gerardii)
Also known as: Bluejoint, Big Blue
Big Bluestem (*Andropogon gerardii*) is a tall, perennial grass that is native to North America and was once the dominant species in the American Midwest prairies. Known for its seasonal color changes, it is widely used for ornamental purposes and in prairie restoration projects.
In This Article
Attributes of Big Bluestem
Lifespan
Perennial
Plant Type
Herb
Plant Height
91 cm to 3.5 m
Spread
60 cm
Leaf Color
Green Blue Purple
Flower Size
2.5 cm
Flower Color
Red Purple Brown
Images of Big Bluestem
Quickly Identify Big Bluestem
1
Bluish-green stems and foliage
2
Turkey's foot-like red inflorescence
3
Small tan caryopsis fruit with feathery spikelet
4
Vivid orange to copper-red fall leaves
5
Slender, pointed leaf blades
Scientific Classification of Big Bluestem
Phylum
Vascular plants
Class
Monocotyledons
Order
Poales
Family
Grass
Genus
Bluestem grass
Species
Big Bluestem
Planting and Growing of Big Bluestem
Care Difficulty
Easy
Watering Schedule
Every 2 days
Sunlight Requirements
Full sun
Sunshine Duration
10-12 hours
Ideal Temperature
68-77℉
Soil Type
Potting Mix, Peat Mix
Soil pH
6.5-7.5
Fertilizer Type
Balanced
Pruning Season
Spring, Summer
Pruning Area
Branches, Leaves
Pruning Frequency
Once a year
Repotting Season
Spring
Pot Type
Plastic, Ceramic
How to Water Big Bluestem?
The appropriate amount of water for Andropogon gerardii, commonly known as Big Bluestem, is around 500 milliliters per watering session. This ensures the soil is moist but not waterlogged, only penetrated enough to reach the root zone without leaving excess water around the plant's base.
What are the symptoms of an underwatered Big Bluestem?
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What should I do if my Big Bluestem is not getting enough water?
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What are the symptoms of an overwatered Big Bluestem?
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How to save an overwatered Big Bluestem?
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What Are the Sunlight Requirements for Big Bluestem?
Andropogon gerardii thrives in full sun, ideally for 6 to 8 hours daily. This range promotes vigorous growth, vibrant coloring, and a strong, healthy structure capable of withstanding environmental challenges.
What is the best location for ideal sunlight?
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How can you ensure consistent light exposure?
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Why is ideal sunlight crucial for this plant?
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What Is the Ideal Temperature Range for Big Bluestem?
The ideal temperature range for cultivating Andropogon gerardii is between 68°F and 77°F. Within this temperature range, the plant can effectively carry out metabolic processes without undue stress. Ensuring temperatures remain within this range promotes healthy growth and helps maintain the plant's physiological balance. Maintaining such temperatures also supports the development of strong root systems and lush foliage.
What Soil is Best for Big Bluestem?
Andropogon gerardii thrives in well-drained soils which prevent waterlogging and root rot. This is crucial for maintaining healthy roots and supporting the plant's ability to absorb nutrients effectively. A nutrient-rich soil provides the essential vitamins and minerals required for vigorous growth in Andropogon gerardii. This nutrient abundance supports robust foliage and overall plant vitality. It requires soil that retains moisture without becoming overly saturated. This balances hydration with aeration, crucial for root respiration and preventing disease.
How to Fertilize Big Bluestem?
For Andropogon gerardii, applying a balanced fertilizer with a ratio specific to your soil test results is ideal. Typically, use 1/2 cup of granular fertilizer per 100 square feet. Adjustments might be needed based on local soil conditions.
How to Prune Big Bluestem?
Look for dead, damaged, or crowded stems. These are the ones you should target first because removing them will encourage better air circulation and sunlight penetration. Make cuts at a 45-degree angle about ¼ inch above a bud. This encourages water runoff and prevents rot, promoting healthier regrowth.
How to Propagate Big Bluestem plant?
1
Collect seeds from mature flowers in late summer. Let them dry and store them in a cool, dark place. Sow seeds in trays filled with a well-draining seed-starting mix. Cover lightly with soil and mist gently to keep the medium moist without being waterlogged.
2
During early spring, dig around the plant using a spade, lifting it gently from the ground. Shake off excess soil and split the plant into smaller clumps using the spade or a sharp knife, ensuring each has roots attached. Replant the divisions immediately at the same depth they were growing previously.
3
Once seedlings have developed a few true leaves, transplant them into larger pots or directly into the garden. Ensure the soil is fertile and well-draining. Water them consistently so that they can continue growing vigorously during their first developing phase.
How to Repot Big Bluestem plant?
1
Andropogon gerardii, commonly known as Big Bluestem, should be repotted when its roots begin to outgrow the current pot or when growth slows, usually every 2-3 years. Spring or autumn is ideal, allowing the plant to acclimate without extreme temperatures.
2
Select a pot that is 1-2 inches larger than the current one with ample drainage holes. A slightly bigger container promotes healthy root growth and reduces the risk of waterlogging, providing Andropogon gerardii with a supportive environment.
3
Opt for a well-draining loamy mix, ensuring a balanced combination of sand, silt, and clay. This soil type supports the tall grass's growth by retaining moisture while allowing excess water to drain, preventing root rot.
