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Fermentation is used to process seeds of certain fruits like tomatoes and cucumbers, where seeds are extracted and allowed to ferment. This breaks down the gelatinous sack surrounding the seeds, reduces seed-borne diseases, and helps in the selection of viable seeds.

Hand-pollination is used to control pollination by manually transferring pollen from one flower to another. This technique ensures genetic purity for seed saving, especially important for species that easily cross-pollinate or for breeding purposes.

Cold stratification mimics natural winter conditions that some seeds need to endure before germination. It involves chilling seeds in a refrigerator or other cold environment to break dormancy and encourage sprouting. This increases germination success for certain plant species.

Seed screening is a technique where seeds are passed through a series of screens or sieves to sort them by size and weight. This helps in selecting the healthiest and most uniform seeds, discarding damaged or undersized seeds, and ensures a more consistent germination rate.

Scarification is the technique of weakening or breaking the seed coat to encourage germination. This can be done mechanically, thermally, or chemically. It aids in germination of hard-coated seeds that might otherwise remain dormant.