Cane Begonia Care Tips. Includes potting-on and pruning. Trish. The Gong Gardener 

Begonia care. Trish. The Gong Gardener.
I forgot to mention in the video, if you don't want your begonia to grow too tall, pinch out the tops.
Position:
• Cane begonias grow and flower best in dapple or morning sun.
• Suitable in pots or garden.
• Can be grown indoors in a very bright position avoiding direct sun. Begonia may not flower or may flower less indoors.
• In frost climates, move indoors or a protected spot outdoors for winter.
Soil/Potting mix:
• Begonias prefer a moist, well drained potting medium.
• Premium potting mixed with ¼ perlite and coir fibre if desired. Orchid bark on top as mulch.
• In the garden, they enjoy a well composted and mulched soil.
• Slightly acid to neutral pH.
• Mulch with quality orchid bark in garden setting as well.
When to prune:
• Prune early spring when frost has past.
How to prune:
• Cut out large old canes at the base. These are usually grey or brown in colour.
• Cut out any twiggy, weak growth at the base.
• Pinch tall canes off at the tips to reduce their height if needed or leave to grow.
Fertiliser:
• Begonias are moderate feeders.
• In pots - feed at potting-on stage using an organic complete fertiliser mixed through the potting mix. Supplement with a good liquid organic or organic based fertiliser or/and worm or weed tea.
• In the ground - Apply organic complete fertiliser in spring and autumn. Also, supplement occasionally with a good liquid organic or organic based fertiliser, or/and worm or weed tea. Add composts and mulch.
• Do not over fertilise as it promotes soft growth which is susceptible to damage from fungal and insects.
Water:
• Do not over-water.
• Water the potting mix to wet thoroughly then let dry out moderately then thoroughly water again.
• Water less frequently in winter.
• Overwatering causes fungal problems particularly if grown indoors. Underwatering causes branches and flowers to dry out.
Mulch:
• Mulch begonias in the garden. Apply manures and/or homemade compost using orchid bark or/and straw mulches.
• Mulch in pots using quality orchid bark.
• Mulches will gently feed your soil and keep it cool and moist during the warmer seasons. Keep mulched all year.
Propagation:
• Use spring prunings as propagation material.
• How to propagate - RU-vid link. • How to propagate using...
Common Problems:
• Cane begonias do not often suffer from pest and disease problems.
• Overwatering can cause fungal and insect problems.
• Under watering (letting dry out for very extended periods) can cause plant leaves to thin and stems and leaves to brown off, become weak and collapse.