Stratification is a means of simulating the chilling and warming that seeds would endure if left outdoors in their native climate, for the winter.
Seed Stratification: Learn More About Stratification Of Seeds And What Seeds Require Cold Treatment
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By Susan Patterson, Master Gardener ...
The seeds of many perennials, trees, and shrubs need periods of chilling and warming to turn off the chemical inhibitors that prevent germination.
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.
Plants native to climates with cold winters often times require a period of moist cold before planting. The method used to simulate the period a seed would spend in the cold moist ground is called Stratification.
~: An artificial process of simulating cold temperatures to aid a seed to germinate.
Sunscald: Cracking or splitting of tree trunks and large branches caused by the sun warming them during the winter. Also damage caused by the sun to some vegetables such as peppers.
A process used to break the dormancy of a seed. This usually requires that the seeds be placed in a moistened rooting medium and kept in the refrigerator or freezer for a designated length of time
~ A temperature treatment of seed used to break dormancy.
Stratified Arranged in horizontal layers.
Striate Striped or having long lines, channels or ridges.
~ 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.
Seed Stratification In The Wild And In The Garden
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~: Storing of seeds at low temperatures under moist conditions in order to break dormancy.
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.
~ 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. Some methods suggest gently scoring the seed with a knife and soaking in water.
~: Some seeds have thick or tough seed coverings. These will need to be soaked overnight in water to help break the cover. This process is called stratification.
Milkweed Cold Stratification Our friends at Painted Lady Vineyard and The Xerces Society have provided these detailed instructions to cold soak and stratify your milkweed seeds to get better and faster germination! ...
This is accomplished by thinning, filing or using sandpaper to break down the coating of the seed.
Embryonic dormancy occurs when the seed embryo needs a trigger in order to germinate. Usually this trigger is in the form of cold moisture or cold stratification.
Seeds that require stratification can often be planted in situe or in a nursery bed in the late fall, where they will undergo the alternate freezing and thawing of the winter months, before germinating in the spring when ground temperatures warm up.
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.
The other form of dormancy is controlled inside the seed and is broken by stratification. Many vegetable seeds lose dormancy when stored dry and no further treatment is needed. Some seeds need to be either chilled or warmed.
The artificial exposure of seeds to this combination of conditions to facilitate germination is called stratification. Optimal temperatures for stratification range between 35 and 45 degrees F and vary with species, as does the length of time seeds must be stratified.
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.
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. Top the layer with another paper towel and lightly moisten it.
Some flower seeds need to have a cold stratification period, which makes fall an ideal time for planting. Find out how to plant flower seeds in the fall with help… Read More
How to Pollinate an Okra Plant ...
~ means the seeds have to be treated with cool temperatures for a certain length of time before they will germinate. Most people probably don't think to stratify their apple seeds. The seeds never germinate hence the idea that they are sterile or infertile.
Softwood stem cuttings are taken and rooted in the summer soon after the flowers fade. The plant is divided in September or in spring. The seed may need stratification and germinates in 20 to 25 days at 70 degrees. Light is necessary for germination.
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.
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; light or darkness for germination; soil temperature; ...
See also: What is the meaning of Plant, Seeds, Flower, Growing, Soil?