Cold Stratification List

seeds-cold-stratification-01-400

Note – Shaw Nature Reserve uses 3 months Cold Stratification for most natives.

Plant Cold Stratification
Agastache 30 days – Surface
Asclepias incarnata – Swamp Milkweed 30 days
Asclepias tuberosa – Butterfly Weed 30 days
Blazing Star – Liatris 60 days
Bronze Fennel Not needed
Cleome Not needed
Coreopsis lanceleaf 30 days
Coreopsis plains Not needed
Dianthus barbatus Not needed
Echinacea 0 – 30 days ????
French Hollyhock – Malva sylvestris Not needed
Gaillardia Not needed – press into soil
Gomphrena – globe amaranth Not needed
Helenium amarum – Sneezeweed Not needed – surface sow tiny seeds
Lobelia cardinalis 60 days – Surface Sow
Maltese Cross Not needed – do not cover????
Marigold Not needed
Rudbeckia 60 days
Rue Not needed
Salvia – purple perennial Not needed???? – needs light to germinate?????
Verbena bonareinsis Not needed
Verbena hastata – Vervain 30 days – tiny seeds
Zinnia Not needed

 

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