Caragana is hardy up to zone 2A. It is a high nitrogen fixer, dense for shelter belts and attracts many pollinators. It's a great addition to any permaculture gardens.
Caragana - Siberian Pea Shrub Seeds
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Soak the seeds for 12 hours and then place in a growing medium (3-4x growing medium for seed volume).
Stratification: Place the damp seeds & medium into a plastic bag or container and then into the fridge (preferably a veggie crisper). Check the seeds regularly to ensure even moisture.
Sow stratified seeds 1/4" deep into a Potting mix. Water evenly until seeds have germinated (typically 20-30 days).