Flatspine bur ragweed (Ambrosia acanthicarpa)
Also known as: Flat-Spine Burr-Ragweed, Bursage, Flatspine Burr Ragweed, Hooker's bur-ragweed, Annual bur-sage
Ragweed, particularly species like Flatspine bur ragweed (Ambrosia acanthicarpa), belongs to the sunflower family and is notorious for triggering hay fever during late summer and early fall. These plants are prolific pollen producers, with each capable of releasing over a billion pollen grains annually, often turning their flowers from green to yellow due to the sheer volume.
In This Article
Attributes of Flatspine bur ragweed
Lifespan
Annual
Plant Type
Herb
Plant Height
91 cm
Spread
Not typically measured; the plant has a more upright growth habit.
Leaf Color
Green Blue
Flower Size
2 mm to 5 mm
Flower Color
Yellow Green
Images of Flatspine bur ragweed
Quickly Identify Flatspine bur ragweed
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The plant can be recognized by its deeply lobed leaves and spiny, bur-like seeds. The stems are often hairy, and the plant typically grows about 30 to 90 cm in height.
Scientific Classification of Flatspine bur ragweed
Phylum
Vascular plants
Class
Dicotyledons
Order
Asterales
Family
Daisy
Genus
ragweed
Species
Flatspine bur ragweed
Planting and Growing of Flatspine bur ragweed
Care Difficulty
Moderate
Watering Schedule
Every 2 days
Sunlight Requirements
Full sun
Sunshine Duration
6-10 hours
Ideal Temperature
60-77℉
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
2 times a year
Repotting Season
Spring
Pot Type
Plastic, Ceramic
How to Water Flatspine bur ragweed?
For Ambrosia acanthicarpa, the watering should be done with about 250 ml each time. The soil should be thoroughly moistened but not waterlogged. Ensure that the water fully penetrates the root zone without leaving the plant sitting in water.
What are the symptoms of an underwatered Flatspine bur ragweed?
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What should I do if my Flatspine bur ragweed is not getting enough water?
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What are the symptoms of an overwatered Flatspine bur ragweed?
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How to save an overwatered Flatspine bur ragweed?
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What Are the Sunlight Requirements for Flatspine bur ragweed?
Ambrosia acanthicarpa thrives in full sun environments with access to 6 to 8 hours of sunlight each day. This condition ensures optimal growth, robust health, and encourages vibrant foliage development.
Where to Place It?
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What Time of Day is Best?
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How to Ensure Proper Sunlight?
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What Is the Ideal Temperature Range for Flatspine bur ragweed?
The ideal temperature range for Ambrosia acanthicarpa is between 60 and 77°F. This range ensures optimal growth and health, offering the plant the best environment to thrive. Consistently maintaining this temperature helps in maximizing the plant's ability to photosynthesize effectively, promoting robust development and resistance to stress.
What Soil is Best for Flatspine bur ragweed?
Ambrosia acanthicarpa thrives in well-drained soil that allows water to pass through quickly, preventing root rot by avoiding waterlogging, essential for maintaining healthy growth in dry landscapes. This robust plant is adapted to thrive in nutrient-light conditions, making it suitable for areas with poor soil quality and reducing the need for frequent fertilization. The plant tolerates a slightly alkaline to neutral pH range, offering flexibility in choosing planting sites and protecting the plant from pH-induced nutrient deficiencies.
How to Fertilize Flatspine bur ragweed?
When fertilizing Ambrosia acanthicarpa, be cautious with the amount you use. For liquid fertilizers, a dilution of half the recommended dose is generally sufficient. This plant doesn't require heavy feeding, so aim for a balanced approach, ensuring that the nutrient solution doesn't overwhelm the soil. For granular fertilizers, a light sprinkling around the base is enough. Always ensure that the soil is moist before applying any type of fertilizer to prevent root burn.
How to Prune Flatspine bur ragweed?
Begin by identifying dead or damaged branches. These should be the first to go as they can drain the plant's resources and hinder new growth. Make your cuts at a 45-degree angle, about a quarter-inch above a bud facing the outside of the plant. This encourages outward growth and enhances airflow through the plant. While pruning encourages growth, be mindful not to remove more than one-third of the plant at a time. Over-pruning can stunt growth and stress the plant.
How to Propagate Flatspine bur ragweed plant?
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Harvest seeds from mature Ambrosia acanthicarpa plants when they turn brown. Ensure seeds are dry and free of any signs of disease or damage before storage.
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Fill seed trays with potting soil and sow the seeds at a depth of 1 cm. Ensure the seeds are adequately spaced to avoid overcrowding and facilitate healthy growth.
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Gently mist the soil with water to maintain moisture without over-saturating. Place trays in a warm, sunny location to encourage sprouting.
How to Repot Flatspine bur ragweed plant?
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The best time to repot Ambrosia acanthicarpa is during early spring, just before new growth begins. Look for signs such as roots poking out of the drainage holes or stunted growth, indicating it's time to provide more space for the growing root system.
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When selecting a pot for Ambrosia acanthicarpa, it’s essential to opt for a pot that is about 2 inches larger in diameter than the current one. A pot with drainage holes is crucial to prevent waterlogging, which can lead to root rot. The extra space will allow the roots to spread and the plant to grow healthily.
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For Ambrosia acanthicarpa, a well-draining sandy soil mix is ideal. This type of soil prevents water from pooling around the roots, thereby reducing the risk of root rot. A sandy soil mix is also light, which will help the roots establish quickly in their new environment.
Toxicity of Flatspine bur ragweed
Is Flatspine bur ragweed toxic to humans?
Humans may experience poisoning upon contact with airborne pollen emitted from the flatspine bur ragweed plant. This plant is known for its potent allergenic properties, with symptoms that can vary from mild to severe. The pollen produced by this plant is toxic, leading to symptoms such as fever, dermatitis, and notably, allergic rhinitis. Wind carries the pollen, posing a risk to individuals who inhale it. This pollen can linger in the air for extended periods and travel significant distances. The flatspine bur ragweed is indigenous to numerous countries and is commonly found in residential areas.
WARNING
The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.
