SEEDS ARE VERY TINY !!! KEEP IT IN MIND!

Sow from mid-January to mid-March.
Sow seeds on the surface of lightly firmed, moist seed compost in pots or trays. Avoid covering the seed or excluding light as this helps germination.
Place in a propagator or warm location, at a temperature of around 24-27C (75-80F). Keep the surface of the compost moist but not waterlogged.
Germination will usually take 15-60 days.
When large enough to handle, transplant the seedlings into 7.5cm (3") pots and continue to grow them on in bright, frost-free conditions.
Transplant begonias into their final containers when they have increased in size.

You can gently brush the seed onto the surface of the compost, or moisten the tip of a toothpick and use it to lift each seed and set it down on the compost. Try to sow them evenly across the surface of the compost.If you have a larger quantity of fine seed then it helps to mix some fine, dry, silver sand in with them. This will help you achieve even sowing across the surface of the compost by making the seed easier to handle and showing you precisely where you have sown.

Don’t cover the seed with compost after sowing as this will bury the tiny seeds and reduce germination. Use a clean, dry wooden press to gently press them seeds into the surface of the compost to ensure that they make good contact. Cover the seed tray with glass or cling film to help maintain a constant humidity and temperature - or put them in a heated propagator if you have one.