Pet Safe
moderate Care
Big Head Purple Star Thistle
Centaurea calcitrapa
Big Head Purple Star Thistle (Centaurea calcitrapa) is a biennial herbaceous plant. It is an erect growing bush with serrated green foliage, and a single large purple-pink flower head atop each stem that can reach up to 50cm in height. Its vibrant blooms appear from June to October and attract bees and other pollinators. It is typically found in grasslands, meadows and roadsides and is tolerant of a variety of soils. Due to its invasive nature, it is not recommended for cultivation but can be used as an ornamental flower.
Sunlight
Full Sun
Water Needs
medium
Water Every
"7-10" days
Sun Needs
full-sun
Growth
Low
Care Level
Low
Watering Schedule
Frequency
Day 1"7-10" daysDay NaN
💧 Water every "7-10" days
Seasonal Adjustments
Adjust watering frequency based on temperature, humidity, and season. Water more frequently in summer and less in winter.
Pro Tip: Check soil moisture before watering. Stick your finger 1-2 inches into the soil—if it's dry, it's time to water!
Season
Fall
Sep Oct Nov
Winter
Dec Jan Feb
Spring
Mar Apr May
Summer
Jun Jul Aug
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Pruning Time
How to Propagate
Seed Propagation
Start seeds indoors 6-8 weeks before last frost date
Division
Divide root ball in spring, replant sections immediately
Cutting
Take 4-6" cuttings in spring, root in water or moist soil
Plant Characteristics
Drought Tolerant
Is This Plant Right for You?
Good For:
- •Forgetful waterers
- •Homes with pets
Consider Carefully:
- •Indoor growing
Bloom Seasons
Care Tips
Light Requirements
Needs at least 6 hours of direct sunlight daily. Place in the sunniest spot in your garden.
Watering
Keep soil consistently moist but not waterlogged. Water when top inch of soil is dry.