The aim of planting some perennials is to get them to germinate, by providing them with a period of stratification (cold conditions required for germination).
Sowing seeds in autumn mimics a process called stratification, which happens naturally in nature – the seeds fall to the ground, and a period of cold weather triggers them to germinate in spring.
This method will also allow us to get a head start on growing our perennials.
Examples of seeds requiring stratification
- Milkweed (Asclepias)
- Black-eyed Susan (Rudbeckia)
- Columbine (Aquilegia)
- Purple coneflower (Echinacea)
- New England aster (Symphyotricum)
- Larkspur (Consolida)
- Lavender (Lavandula)
- Lupine (Lupinus)
- Ironweed (Vernonia)
- Catmint (Nepeta)
- Soapwort (Saponaria)
- Pincushion flower (Scabiosa)
- St John’s wort (Hypericum)
- Marsh marigold (Caltha)
- Perennial sunflowers (Helianthus)
- Bleeding heart (Dicentra)
- Monkshood (Aconitum)
- Globeflower (Trollius)
- Turtlehead (Chelone)
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