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key growing information
Growing Saponaria From Seed
How to grow saponaria (soapwort) from seed: cool-summer performance, succession sowing, direct sowing in cool soil, transplants, cutting stage and uses.
By Hensley’s Seed Co.
Saponaria - Key Growing Information
DAYS TO GERMINATION:
Allow 7–10 days at 70°F (21°C).
SOWING:
Does best where summers are cool. For steady bloom, sow every 2–3 weeks until midsummer; flowering runs July into August. Sowing in place is recommended, in early spring while the soil is cool and light frost is still possible: plant 2–3 seeds every 2", 1/8" deep, and thin to 2–9" when the first true leaves appear. For transplants, sow straight into 72-cell plug flats, 2–3 seeds per cell, 2–3 weeks before the last frost. Cover lightly and thin to one plant per cell, then harden off and plant out after the last frost.
LIGHT PREFERENCE:
Full sun.
SOIL REQUIREMENTS:
Average soil with good drainage.
PLANT SPACING:
Space plants 2–9" apart.
HARDINESS ZONES:
Grown as an annual.
HARVEST:
Cut when 1–2 flowers on a spray have opened.
USES:
A superb filler for bouquets and a cottage-garden favorite.
SCIENTIFIC NAME:
Gypsophila vaccaria
ALTERNATE NAMES:
Soapwort, cow soapwort.
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