If there is surrounding material (chaff) on any of your seeds, make sure to clean it off. Chaff can harbour diseases and lead to damping off and unviable seeds.
Some seeds, such as hellebore, should be sown immediately after collection. But most can be stored until spring.
Store seeds in a dry, airtight container. Paper bags are a good option, but I use old Tic Tac boxes. They are small, handy and sealable.
Make sure to label all your containers so you know what’s in them! You can also add a dehumidifier like Silica gel to stop seeds deteriorating. Then store in a
cool place – a fridge is ideal.
Many seeds will last for years in a dry environment at around 5C.
Remember, seeds from hybrid plants will be very variable, so it’s best to take them from ‘true’ plants.