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FutureStarrSeed Stratification Methods
Stratification is a way of breaking up seeds into plots of land so the best seed types can be easily selected and planted.Long-lived perennial plant seeds have mechanisms to prevent germination until conditions are right for successful growing. Perennial seeds go dormant over the winter and then need their dormancy broken in the spring. The techniques below are for perennial seeds only, do not use these techniques on annual or bi-annual vegetable, herb or flower seeds. Germinating Your Seeds is Fun and Easy. Methods vary by plant type. Seeds of annual plants have a shallow dormancy and do not need a winter to germinate, they only live one season. Annuals generally are buried to a depth equal to the size of the seed in moist well drained soil. Some, like tomatoes and peppers, require warm soil or a heat mat to germinate.
Some seeds require scratching or nicking the hard seed coat to allow moisture to enter the seed to begin germination. This mimics natures weathering or the gnawing of rodents. Medium to larger seeds can be nicked with a knife, filed or rubbed with sandpaper. Rub smaller seeds between sandpaper or emery paper. Hobby rock tumblers can be used to scarify larger seed volumes. Abrade only the outer coating, embryos should not be cracked or damaged to remain viable. Commercial nurseries scarify using solutions of sulfuric acid.
This method works best for medium and larger seeds a few weeks before last frost. You are trying to imitate snowmelt. Place seeds in a small jar and fill with cold water. Viable seeds should sink, although this is not true for all seeds. Many flat seeds or seeds with edges float. Change water daily, your are trying to wash germination inhibitors in the seed. Sow after two weeks. You can also try putting seeds in a small muslin bag and suspending them in the toilet tank. What could be easier, automatic rinsing. (Source:www.permaculturenews.org)