Since strawberry seeds grow on the skin rather than in the center of the berry, figuring out how to save the seeds is not as evident as in other fruit. Extracting the seeds, however, is fairly easy, especially if you have some strawberries past their prime. Save your seeds to plant in the spring as single plants in jars or in rows about 18 inches apart, which is the most effective method, according to specialists at the University of Maine Cooperative Extension. In a few months, you should have beautiful, blossoming strawberry plants, great for eating right away or canning.
Wait until your strawberries are overripe.
Place your strawberries into the strainer.
Press your spoon or fork against the strawberries in the strainer to squeeze out the juice until all the juice is pressed out and you can clearly see the seeds separating from the juice. Take care when doing this step to avoid breaking the seeds.
Place the strainer under running water, allowing the juice and strawberry pulp to run out.
Flip the seeds in the strainer onto a plate.
Allow the seeds to air-dry for a few days.
Gather up your seeds and place them in a dry envelope until you are ready to plant them.