Here's a great soil mix for growing great Begonia plants.
Courtesy of Alan Taylor and Gardening Australia.
- 2 parts coir for orchids (soak and wash coir in water to remove unwanted salts, then shred to a fibrous material)
- 3 parts coco peat brick (or similar)
- 2 parts premium potting mix
- 0.5 parts perlite
- 0.5 parts coarse sand