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Maltese Star-Thistle
Also known as: Malta Starthistle
Maltese Star-Thistle (Centaurea melitensis) is an annual herb native to parts of Europe and Africa which is classified as a noxious weed in parts of the U.S. and can be invasive. It blooms from spring to summer with small flower heads covered with light brown to purple spiked appendages and tiny yellow disc-shaped florets.
Scientific classification
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Annual, Biennial
Lifespan
Herb
Plant Type
Spring, Summer, Fall
Bloom Time
30 cm to 61 cm
Plant Height
1.3 cm
Flower Size
Yellow
Flower Color
Semi-evergreen
Leaf type

Images of Maltese Star-Thistle

Distribution of Maltese Star-Thistle

Distribution Map
Maltese Star-Thistle's establishment extends across various regions. Originating in parts of the Mediterranean, maltese Star-Thistle has adapted to diverse climates and can now be found across multiple continents. While considered invasive in certain areas of South America and Central America, maltese Star-Thistle has been introduced to both hemispheres, notably in temperate zones. This species' adaptability may have an impact on ecosystems where their presence is notable, although it does not universally disrupt native flora and fauna.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Wasteplaces, roadsides
Hemisphere Trend Curve

Care Guide for Maltese Star-Thistle

Every week
Water
Full sun
Sunlight
20 - 35 ℃
Ideal Temperature
Water: Maltese Star-Thistle, native to Mediterranean climates, thrives in dry conditions and is drought-tolerant, needing weekly watering. To cultivate successfully, allow soil to dry between waterings. Adjust watering schedules during the growing season to account for increased sunlight and temperature effects on hydration needs.
Fertilize: For maltese Star-Thistle, use a balanced nutrient mix and high-nitrogen fertilizers during active growth. Fertilize monthly in the growing season, reducing frequency in dormancy. Water before application to prevent root burn. Adjust fertilizer type and amount seasonally for optimal vigor and flowering.
Pruning: Maltese Star-Thistle has spiky foliage and bright yellow flowers. Prune in early to late spring to promote growth, removing dead stems, and trimming overgrown areas for shape. Avoid heavy pruning during peak blooming to reduce stress. Regular pruning maintains appearance and reduces invasive spreading.
Propagation: Maltese Star-Thistle is propagated via sowing seeds in well-draining soil after the last frost. Lightly press seeds into the soil and keep it moist for germination. Once sprouts appear, thin seedlings to prevent overcrowding, and manage weeds to reduce competition for resources.
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