Rheum x cultorum (x rhaponticum) Bronnen
| 11 | Jacke, D., & Toensmeier, E. (2005). Edible forest gardens, volume II: ecological design and practice for temperate-climate permaculture (Vol. 2). Chelsea Green Publishing. |
| 11 | Jacke, D., & Toensmeier, E. (2005). Edible forest gardens, volume II: ecological design and practice for temperate-climate permaculture (Vol. 2). Chelsea Green Publishing. |