ACROSS
1. Settled (a problem or argument) (8) 5. Plateau west of the Drakensberg stretching across Gauteng and the Free State (8) 9. A dark-brown malt liquor (6) 10. Tropical Asian plant yielding a coarse kind of cinnamon (6,4) 11. Area producing liquid fossil fuel 14. Loose material that nourishes plants (4) 17. Pale like the dust of something burnt (5) 18. Breed of poultry originating in Kent, England (9) 19. Tree of the birch family and a light-brown colour (5) 20. Desiccated (5) 22. Plants and animals that require free oxygen for respiration (7) 23. Any plant of the family that includes wheat, bamboo, and kikuyu (5) 25. Decomposed organic matter in soil (5) 27. Strong, flexible material sourced from large marine mammals, also called baleen (9) 28. Flardy breed of cattle indigenous to South Africa (5) 30. Require (4) 32. To cover an area with trees (8) 34. Of seeds, producing oil (9) 35. Hindmost part of cattle often used to make soup (6) 36. Seedless thin-skinned mandarin oranges (8) 37. Most premature (8)