Unlike other types of berries, strawberries can be grown by nearly any gardener. They thrive in both small and large beds, as well as in pots and hanging baskets. You can expand your strawberry bed by either dividing the strawberry plants or by planting them from seed. While it takes longer to produce a harvest when growing by seed, it is less expensive than purchasing plants if you wish to expand your bed greatly. Strawberries produce seeds on the outside of the fruit, making them easy to see when you are collecting them.
Harvest strawberries from the healthiest, best producing plant in your strawberry bed. Pick the berries once they become overripe and soft.
Place a berry inside a fine-mesh kitchen sieve. Push the berry through the sieve forcing most of the pulp through the mesh and leaving the seeds behind. Repeat for each berry you are collecting seeds from.
Leave the seeds in the sieve and rinse any remaining pulp from them under cold tap water. Drain thoroughly after rinsing.
Spread the seeds out on a paper plate so they aren't touching each other. Set the plate in a warm, dry place for one week. Stir the seeds three days into the drying time to prevent them from sticking to the plate.
Label a jar or envelope with the strawberry variety and the year harvested. Place the seeds inside, then seal it closed. Store in a cool, dry place until you are ready to plant the seeds.