Armenian Basketflower Centaurea macrocephala
ABOUT
The plant known commonly as the Armenian basket flower features distinct large, yellow, thistle-like flowers that command attention. Each flower head is encased in a cup of overlapping bracts that have a straw-colored hue, resembling a woven basket, which is how it gets its common name. These bracts are long, with an almost leafy appearance, providing an ornamental value even when the plant is not in bloom. The flower heads themselves are globe-shaped and bright, made up of multiple tiny florets closely packed together, giving them a pincushion effect. The overall look of these blooms is quite striking and bold, often serving as focal points in garden settings. The foliage of the Armenian basket flower is also noteworthy, with leaves that have a silvery-green color, providing a beautiful contrast against the rich yellow of the flowers. The leaves are lance-shaped with distinctively serrated edges, lending a slightly spiky texture to the plant's appearance. They grow densely along upright stems that are sturdy and able to support the weight of the substantial flower heads. The plant showcases a lush, bushy appearance due to the abundance of these stems and leaves, creating a rich backdrop for the eye-catching blooms that appear in the summer months. Despite its ornate look, the Armenian basket flower exudes a certain ruggedness, with its substantial blossoms and foliage, and a general impression of durability and strength. This plant is appreciated not only for its decorative blooms but also for its ability to add structure and texture to gardens without requiring overly particular care.
About this plant
NamesFamily
Asteraceae
Synonyms
Armenian Basketflower, Giant Knapweed, Bighead Knapweed, Globe Centaurea, Yellow Hardhat
Common names
Centaurea macrocephala.
ToxicityTo humans
Centaurea macrocephala, commonly known as the Armenian Basket Flower, is not widely recognized as a toxic plant to humans. There is limited information on its toxicity, and it is not commonly listed as a plant that causes poisoning when ingested. However, as with many plants, it may cause gastrointestinal upset if ingested in large quantities due to the presence of saponins or other irritant compounds. In general, it is advisable to avoid ingesting parts of ornamental plants due to the potential for unknown toxic substances.
To pets
The Armenian Basket Flower, also known as Centaurea macrocephala, does not have a well-documented toxicity profile when it comes to pets such as dogs and cats. It is not commonly listed among plants known to be poisonous to household pets. Nevertheless, ingestion of plant material can sometimes cause mild gastrointestinal upset in pets due to non-toxic irritation or individual sensitivity. Signs of such upset might include vomiting, diarrhea, or drooling. If a pet ingests a significant amount of the plant, or if any concerning symptoms develop, it is recommended to consult a veterinarian.
CharacteristicsLife cycle
Perennials
Foliage type
Deciduous
Color of leaves
Green
Flower color
Yellow
Height
3 feet (91 cm)
Spread
2 feet (61 cm)
Plant type
Herb
Hardiness zones
3
Native area
Caucasus
Benefits
General Benefits- Attracts Pollinators: Centaurea macrocephala, also known as Globe Centaurea, is known to attract bees and butterflies, which are important pollinators for the ecosystem.
- Drought Tolerance: Once established, Globe Centaurea is tolerant to drought, making it suitable for xeriscaped gardens or areas with low rainfall.
- Low Maintenance: It requires minimal care once established, making it a convenient choice for gardeners of all skill levels.
- Ornamental Value: With its large, yellow, thistle-like flowers and attractive foliage, Globe Centaurea adds aesthetic value to gardens and landscapes.
- Resistant to Pests and Diseases: This plant is generally resistant to pests and diseases, reducing the need for chemical treatments.
- Soil Adaptability: It tolerates a variety of soil types, although it prefers well-drained soil, making it versatile for different garden settings.
- Long Blooming Period: The plant has a long flowering season, typically from mid to late summer, providing extended visual interest.
- Erosion Control: The root system of Globe Centaurea can help stabilize soil and prevent erosion.
- Provides Habitat: The plant can offer habitat and food sources for wildlife, contributing to biodiversity.
Medical Properties- Anti-inflammatory: Centaurea macrocephala has been traditionally used to reduce inflammation.
- Antiseptic: The plant may possess mild antiseptic properties for wound care.
- Diuretic: It is sometimes used to promote urine production and relieve fluid retention.
- Choleretic: Centaurea macrocephala may encourage the production of bile and its flow into the small intestine.
- Antioxidant: The plant contains compounds that could have antioxidant effects.
Air-purifying QualitiesThis plant is not specifically known for air purifying qualities.
Other Uses- The golden thistle's dried seed heads can be used in flower arrangements, providing a unique texture and lasting form.
- Due to its strong stem and unique appearance, the golden thistle can be used for crafting, such as in wreath-making or as a natural decorative element in various DIY projects.
- The plant's striking appearance can enhance the aesthetic appeal of sustainable architecture when planted in green roofs or living walls.
- Its extensive root system makes the golden thistle suitable for erosion control on slopes and in areas susceptible to soil degradation.
- Golden thistle can be planted in butterfly gardens to provide a visual attraction, even though it's not specifically known for attracting butterflies.
- The plant may serve as a natural fence or barrier due to its height and dense growth habit, providing privacy and security in garden settings.
- In educational gardens, the golden thistle can be introduced to teach about different plant morphologies and adaptations due to its unique flower structure.
- Golden thistle can be utilized in landscape photography to add a splash of color and texture to natural scenery compositions.
- As a monocultural plot in an ornamental garden, the dense and uniform nature of golden thistle can highlight pattern planting techniques.
- The seeds of the golden thistle can be used for bird feed, particularly attracting finches and other seed-eating birds that appreciate the seed size and structure.
Interesting Facts
Feng ShuiThe Giant Knapweed is not used in Feng Shui practice.
Zodiac Sign CompitabilityThe Giant Knapweed is not used in astrology practice.
Plant Symbolism- Protection: Centaurea macrocephala, commonly known as the Globe Centaurea or Giant Knapweed, is often associated with defense and protection due to its hardy and resilient nature, capable of thriving in challenging conditions.
- Strength: Its robust stature and vigorous growth habit symbolize strength and endurance.
- Independence: Globe Centaurea's ability to grow in poor soils and resist pests and diseases signifies self-reliance and independence.
- Uniqueness: The striking appearance of the Globe Centaurea, with its large, round, thistle-like flower heads, represents uniqueness and standing out in a crowd.
- Persistence: The plant's long blooming period reflects persistence and the ability to maintain beauty despite adversity.
WaterThe Giant Knapweed should be watered regularly, aiming to keep the soil evenly moist but not waterlogged. During the growing season, water approximately once per week with about 1 to 1.5 gallons per plant, depending on weather conditions. Always check the top inch of soil for dryness before watering. Adjust the frequency during hot, dry periods by watering more often, and reduce watering in cooler, wetter seasons to prevent overwatering and root rot.
LightThe Giant Knapweed thrives in full sun conditions. It requires at least 6 hours of direct sunlight daily, making it ideal for open, sunny gardens or south-facing spots. Avoid placing it in deep shade, as this can reduce flowering and weaken the plant.
TemperatureThe Giant Knapweed is hardy and can tolerate a range of temperature conditions. It can survive in temperatures as low as -30°F and as high as 100°F. However, the ideal temperature for this plant is between 60°F and 75°F, where it will grow most vigorously.
PruningPrune the Giant Knapweed to maintain its shape and encourage more blooms. Deadheading spent flowers can promote a second bloom in the season. Prune back foliage in late fall or early spring to keep plants tidy and healthy. The best time for extensive pruning is after flowering has finished.
CleaningAs needed
SoilThe Giant Knapweed (Centaurea macrocephala) thrives best in well-draining loamy soil with a pH range of 6.0 to 7.0. A mix of two parts garden soil, one part sand, and one part peat or compost will provide the nutrients and drainage needed for optimal growth.
RepottingGiant Knapweed does not require frequent repotting; it can be done every 2-3 years or when the plant becomes root-bound. Early spring is the best time for repotting this perennial.
Humidity & MistingGiant Knapweed is tolerant of a wide range of humidity levels and does not require any special humidity conditions; it grows well in the ambient humidity found in most outdoor environments.
Suitable locationsIndoor
Grow Giant Knapweed indoors in bright light and well-draining soil.
Outdoor
Plant in sun, well-draining soil; space 18-24 inches apart.
Hardiness zone
3-7 USDA
Life cycleGiant Knapweed (Centaurea macrocephala) begins its life cycle as a seed, which upon finding suitable conditions, germinates and develops into a seedling with a rosette of foliage at ground level. As it matures, the plant develops a strong, leafy stem and forms a deep taproot system which allows it to survive periods of drought. In the following season, it produces tall flowering stems topped with large, globular yellow flower heads that are highly attractive to pollinators, particularly bees and butterflies. After pollination, the flowers turn into seed heads, dispersing seeds that can give rise to new plants (though it may not prolifically self-seed). Over the winter, the plant may die back to the ground, with the taproot enabling it to regrow the following spring (perennial habit). The plant continues this cycle, flowering annually and possibly living for several years if the conditions are favorable.
PropogationPropogation time
Late summer
The most popular method of propagation for the Centaurea macrocephala, commonly known as Armenian Basketflower or Giant Knapweed, is by seed. The best time to sow the seeds is in late winter to early spring. To propagate by seeds, first, start them indoors in seed trays filled with a well-draining soil mix. Distribute the seeds on the soil surface and lightly press them into the soil without covering them, as they need light to germinate. Keep the soil moist but not waterlogged. Germination usually occurs within two to three weeks at a temperature of about 70°F (21°C). After the seedlings have developed a couple of true leaves, they can be transplanted outdoors to a sunny spot with well-draining soil after the danger of frost has passed.
