Is it possible to freeze plants, thaw and plant them? It appears that freezing plants or live plant tissue can be tricky and fairly complicated. It might be possible to freeze plants, clones for example, if you want a particular variety for later use.
Plants generally go through a two-phase freezing process. First the extra-cellular water content freeze once temperature reach between 23 to 14ºF (Varies by plant type). The extra-cellular water is (water outside the cells) in the plant's tissue. Then under the right conditions such as extreme cold (-4 to -40ºF *varies by plant type), the intra-cellular water content would freeze. The intra-cellular water content is water within the cells.
If allowed to freeze slowly, plants intra-cellular water content will freeze into ice crystals and kill the plants. It's widely believed that it's the ice crystals that is responsible for the plant's death and not the process of freezing them.
Researchers suggested freezing plants rapidly to prevent formation of ice crystals in the intra-cellular water content. Rapid freezing such as liquid nitrogen is recommended for freezing live plant tissue. This method is not 100% effective.
source : hydroponicarticle
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