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Many processes in the garden year require special preparation. This is especially true for the sowing of new plants. One way to prepare for sowing is to stratify. In stratification, seeds undergo a special treatment designed to promote germination of the seed. One way to stratify is to sow the seeds in the fall or early spring when the soil is not frozen but still cold.
Stratifying in the fridge is a handy thing, especially for home gardeners. Usually not many seeds need to be treated and for that the refrigerator is usually sufficient. Only a few seeds need frost. The best way to pack the seeds so with a little wet sand, perlite or handkerchiefs in a plastic bag. The risk of mold growth is relatively low. Earth molds much faster. The seed is initially warm, about 2 to 4 weeks. Temperatures around 20° C are ideal. The seeds must be moist, but never wet. Afterwards they are put in cold, at temperatures between -4 and +4° C. The cold phase should be about 4 weeks, sometimes even 6. Then the seeds are sown. But you must not go to the heat immediately. Ideal are temperatures between 5 and 12° C. Many seeds are already in the fridge. Do not warm them too!
Typical cold germs that must be stratified
Sky Key, Pasque Flower, Christmas Rose, Cloudberry, Wild Garlic, Cowbell, Aromatic Violet, Lady's Mantle, Adonis, Monkshood, Bergenia, Saxifrage, Gentian, Liverwort, Peonies, Trollflower, Silver Thistle, Alpine Thistle, Herbs, Cabbage, Sweet Thistle, Plum, Lavender, Columbine, Mandrake, Anemones, Arum, Aster, Bard, Bittern, Blausegge, Bush Mallow, Wood anemone, Clematis, Echinacea, Edelweiss, Stonecrop, Foxglove, Funkia, Ginseng, Bluebells, Gundemann, Buttercup Family, Autumnal Season, Hibiscus, Iris, Cornflower, Privet, Carnations, Lilies, Lupins, Marchpipe, Poppy, Daffodils, Cloves, Pipefish, Phlox, Glittering Candle, Primroses, Ranunculus, Larkspur, Sage, Soapwort, Candytuft, Sunhut, Perennial Sunflower, Pansy, Hollyhock, Bleeding Heart, Grape Hyacinth, Violet, Forget-me-not, Walnut, Woodruff, Winterling, Ornamental onions, fences and many more
Seeds often contain the genus of so-called cold germs. In contrast to the frost germs, which are often early flowering plants, the seed must be prepared for germination cold, but not in frosty soil. The stratification of these cold germs is that the seeds are kept for a prolonged period in a cold and humid environment, so as to have a longer period of time for germination.
Stratification can be done in multiple locations. So, for example, the storage of seeds in a cold cellar is conceivable, there are also specially designed devices for amateur and professional gardeners. However, if you do not own a cellar, you can still stratify seeds. It is quite possible to stratify seeds in the refrigerator. It is important that the seeds are kept in a moist surface, in the refrigerator, this is also a sand-filled plastic bag used. It is important that the seeds in the underground have been at room temperature for about one month before. In the refrigerator they remain at a temperature between -5 and +5 degrees Celsius for another 6 weeks.
It should be noted on seed sachets, if a plant is a cold germ and the seeds have to be stratified. But if you win seeds yourself or get them for free, things will look different. It is best to ask how the seeds must be sown. This can be done with the gardener of his trust, although of course they are anxious to sell plants themselves. In any case, one learns a lot on the World Wide Web about the corresponding plants and also about the propagation.