S hr str det p Seed Germanation Database.
"Amsonia hubrichtii, illustris, orientalis, and tabernaemontana , Sow at Max. 5C (41F) for 6 weeks, move to 20C (68F) for germ. in a few days. If no germ. in 3 wks, dig out seeds and give them 8 to 12 hr. soak. "
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