Stratification is a means of simulating the chilling and warming that seeds would endure if left outdoors in their native climate, for the winter.
thermal stratificationThe successive horizontal layers of a body of water having different temperatures, each layer more or less sharply different from the adjoining ones, with the warmest at the top. See also: thermocline, epilimnion, turnover.
Stratification.
The seeds of many perennials, trees, and shrubs need periods of chilling and warming to turn off the chemical inhibitors that prevent germination.
Stratification - Oftentimes when someone refers to stratification, they are referring to the process of cold treating a seed in order to break its dormancy.
Stratification- The chilling of seeds to improve germination.
Wildflower- A herbaceous species of plant that is capable of growing, reproducing and becoming established without actual cultivation.
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Stratification: An artificial process of simulating cold temperatures to aid a seed to germinate.
Stratification
The seeds of many plants that are native to regions with cold winters require a period of moist coolness before they will germinate.
Stratification- A pregerminative treatment to break dormancy in seeds and to promote rapid uniform germination accomplished by exposing seeds for a specified time to moisture at near-freezing temperature sometimes with a preceding exposure to ...
Stratification A temperature treatment of seed used to break dormancy.
Stratified Arranged in horizontal layers.
Striate Striped or having long lines, channels or ridges.
stratification The exposure of seeds to moisture or low temperature to overcome dormancy.
style The part of a plant's female sex organ that supports the stigma and connects it to the ovary.
Stratification of Seed
The process used for making seeds with very hard shell covers ready for germination. It generally requires keeping the seeds cold and moist for periods of time.
STRATIFICATION: Storing of seeds at low temperatures under moist conditions in order to break dormancy.
STRATIFICATION - Chilling process done to seeds to enhance their germination.
SUCCULENT - Succulents plants have leaves and/or stems which are thick and fleshy. They often have waxy outer layers that allow the plants to retain water well.
Although Angel Wings rose does not require stratification, germination can sometimes be erratic, extending over the course of one month. About 6 weeks before the last frost date, sow seeds 2" apart and " deep into well-drained seed starting mix.
According to Neil Diboll of Prairie Nursery, this "moist stratification" procedure yields a significantly higher germination rate (about 90 percent) than seeding in a cold frame in early spring.
This stratification method seems to speed up and even out the germination process in some varieties.
Some seeds require a cold treatment, called stratification, to germinate. Place these seeds between used fabric softener sheets, surround them with moist potting soil inside a plastic bag and chill in the refrigerator for four to 12 weeks.
For hardy perennials that need stratification (a period of chill), there are good reasons to sow seeds in the fall, i.e., low cost and no transplant shock.
These plants have a complicated double dormancy that requires 6-12 months of warm, moist stratification followed by 3 months of cold stratification.
Some tree seeds don't require stratification. These include bristlecone pine, ponderosa pine, mugo pine and catalpa. When in doubt, however, stratify the seeds of trees and shrubs.
Photograph courtesy of Judy Sedbrook.
Seeds that require Stratification I am new to wintersowing, do you have a list of seeds that require a cold period to germinate?
Doug says he doesn't maintain a list of perennials that ...
The process is called "cold stratification." Now is the time to grab the paper towels. Spread them out on a clean, flat surface, sprinkle them with water, and lay down seeds about an inch apart.
They can also be started from seed which do not require stratification.
Problems
Spider mites, aphids, mealy bugs and scale.
Mine is a three part system, although technically my fridge's butter bin acts as a forth part for seeds that require some time in the cold (aka "cold stratification").
Propagate by seed, division or separation - Division is easiest method. Divide in spring. Make sure several each division has several growing points. Seeds need stratification (cold treatment) to germinate.
It means to scratch, file, expose to dampness, freeze and thaw or soak in hot water. Nut or fruit seeds may need a tap from a hammer. Not to be confused with "stratification" which means to give a seed a cold or warm treatment.
Before sowing any herb, whether in flats or directly in the garden, check its specific germination requirements to see how early you'll need to start it and whether it requires any special handling (a period of cold dormancy, or stratification; ...
Then there are the camera-wielding day-trippers, most of whom lay no claim to islander status and are often too busy trying to get a glimpse of Jake Gyllenhaal to bother with the intricacies of social stratification anyway.
 See also: Plant, Seed, Flower, Soil, Spring
  
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