Growing Begonias From Seed
Fill a seed tray with seed compost, lightly firm it down and
water until moist but not saturated with water. Begonia seeds
are very small, so it is best to mix the seeds with fine sand or
dry compost and then spread the mixture onto the top of the
Do not cover the seeds with more compost, but
cover the container with cling film or any clear polythene.
Place the container in a shaded or dark position in a warm room in the
house. The ideal temperature is 20 - 22C (68 - 72F), although
the temperature in an evenly heated house should be OK. Watch
the seeds daily for emerging begonia seedlings - this normally takes
about two weeks. As soon as the seedlings appear, remove the
polythene and place the tray in a light position (a windowsill
is suitable). For the first couple of weeks, it is
essential to keep the seedlings out of direct sunlight, it will
scorch and kill them. If the window sill is cool, cover the
container with a cardboard box at night, but remember to remove
it each morning. When the seedlings are large enough to handle (about
2cm / 3/4 inch), prick them out from the seed tray and repot them in 7cm (3 inch) pots.
For use as bedding, tubs and pot plants, it is hard to beat the
begonia 'Ambassador' F1 mixed, which is available from Dobies as a 'coated' seed, making it much easier to sow - it's an excellent variety for the novice gardener.
Another excellent variety is 'Non Stop', another F1 hybrid which
is available from Suttons.