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Cold Storage for Seed
This is a prolonged method for saving seeds. Most of the information I give here is a home modification of what the Kew Gardens explained a couple of years ago. The best way to save seeds is for long storage is to place them in sealed glass vials. However since the average householder doesn't have access to glass tubing and a bunsen burner, the second best was suggested to be a glass container sealed with a rubber stopper. This is much easier as almost anyone can obtain rubber stoppered test tubes and this is what we use, for smaller seeds.
First one must have clean seeds dried to room humidity. One should check for viablity at this point. Place a very small amount of desiccant in the bottom of the test tube and block with a wad of paper (keeps the desiccant off the seeds but allow the moisture to seep across to the wad). Place a label on the inside of the tube. This will ensure that you will not lose the label or the information on it once it is in storage. Add your seed. Stopper tightly. Place seeds in your fridge for period of 3 weeks, where the seed will go into a "dormant" state, losing more excess moisture and slowing down the respiration rate. Once the seeds have this conditioning they are ready to place in the deep freeze at -18C.Grunt has made me several boxes, about 9"x9" with shallow holes in the bottom that will hold 100 test tubes.
We add a list to each box of seed giving the position of each tube of seeds and also keep 2 master lists (one of each box and one of all the varieties saved). This is done both by hard copy and on the computer.
For larger seeds, such as corn or beans, one can place desiccant (1/2 tsp.) in the bottom of a canning jar (1 or 2 quart or 1 or 2 litre). Place your seeds in a paper bag, roll up securely, tie shut. Place the bag inside the jar and use either a sealing lid or glass lid plus rubber ring and metal sealer ring. Treat seeds the same way, with a 3 week stint in the fridge.
When you go to recover your seeds remember to reverse the conditioning step except you place them in a test tube without desiccant. Also you can place a small cotton ball soaked in thyme tea inside the rubber stopper. Use thyme tea as it contains natural antibiotic and antifungal properties. Remember to squeeze out all excess moisture and replace the cotton ball every 2 to 3 days. After reconditioning, it also helps to soak the seeds in water for 15 minutes to an hour before sowing.
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