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Stratification

Gardening  Strain  Stratify
04/16/2014

Seed Stratification: Learn More About Stratification Of Seeds And What Seeds Require Cold Treatment
Image by David Eickloff
By Susan Patterson, Master Gardener ...


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- 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- 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.

Seed Stratification In The Wild And In The Garden
by Kent Lofgren (2 followers) ...

Stratification
Many seeds need a cold period so they will germinate. This is most often referred to as their 'chilling period'.

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: 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.

Seed Stratification Techniques
Seed stratification is a method employed for the germination and growth of seeds that need moisture to grow. In the stratification process, a seed is placed in a moist environment to stimulate its growth.

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.

Stratification A method of storing seeds or other reproductive structures at a temperature from 35 to 45F (2 to 7C) in alternate layers with (or mixed in with) moist sand, peat moss, or other medium, as a means of overcoming dormancy.

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.

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.

The artificial exposure of seeds to this combination of conditions to facilitate germination is called 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.

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.

Stratification 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.

Propagation: The large, beanlike seeds of lupines can be slow to germinate without winter stratification. Lightly abrading the seed coat with sandpaper will allow water to penetrate and speed germination.

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; ...

All species are grown from seed, with highly variable seed stratification requirements.

See also: See also: Plant, Flower, Soil, Growing, Seeds

Gardening  Strain  Stratify
04/16/2014

 
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