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key growing information
How to Grow Iceland Poppies (P. nudicaule)
How to grow Iceland poppies from seed: starting plugs, sowing seasons, cool temperatures for bloom, hardiness, and cutting at the cracking-bud stage.
By Hensley’s Seed Co.
Iceland Poppy (P. nudicaule) - Key Growing Information
DAYS TO GERMINATION:
Seedlings appear in 7–12 days at 65–75°F (18–24°C).
SOWING:
For transplants, sow into 128-cell or other small-cell trays 6–8 weeks before planting out, covering the seed very lightly. Water from below or mist so seed and mix stay put. Harden off and plant outdoors, or set plants straight into a covered structure. To sow directly, plant in early spring, fall or winter on the surface, keeping the soil evenly moist until seedlings appear. Iceland poppies like it cool, below 70°F; flower numbers and quality drop as temperatures climb. Pinching isn't needed and doesn't help.
LIGHT PREFERENCE:
Full sun to partial shade.
PLANT HEIGHT:
Grows about 15–20" tall.
PLANT SPACING:
Space plants 6–12" apart.
HARDINESS ZONES:
Hardy in Zones 4–9. Outdoors, it blooms from late spring into summer in the North and from early spring into early summer in warmer areas. It prefers cool summers, reseeds readily, and may behave as an annual or perennial depending on conditions.
VASE LIFE:
About 5–7 days.
HARVEST:
Cut as the buds are just cracking to show a little color, before they unfold, and put stems in clean water.
SOIL REQUIREMENTS:
Moist soil with good drainage.
USES:
Cut flowers, beds, borders, massed plantings and containers.
SCIENTIFIC NAME:
Papaver nudicaule
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