I haven't had success with these yet. But if I ever get where I can try them again I will. I've gathered the following information so far but I could definitely use any hints tips or corrections you have as far as dealing with these plants
Scientific Name of plant
: Eryngium alpinum
Common Name of plant
: "Alpine Sea Holly"
Days to Germination: around 89 days
USDA growing zone
: 5 to 9
Conditions for sprouting: Direct sow only. Place seeds
on top of the soil and press lightly so they do not move when watering, some types need light to germinate. Needs a soil temperature of 68F or cooler. Chilling seeds
may help with the germination but is not considered necessary.
Lighting requirements: Full Sun
Fertilizer requirements: Average
Watering requirements: Can take drought conditions
Soil requirements: Light Sandy Soil pH:
Dead Heading: Only if not harvesting seeds
spikes: No plant
spacing: 18 inches
Pruning times and amounts:
Conditions for Blooming: plant
Life Cycle: Perennial
Propogation: Propagate by division, seed
or root cuttings all done in the spring
. Division will be difficult because of a taproot.
Height of plant
: 24 to 30 inches
Color of Leaves: Green
Color of flowers
Special requirements (i.e. dormancy): Do not start indoors, they do not like to be transplanted. The can be topped after blooming to develop side blooms.
Notes: Can Winter sow