ACROSS
1 Of crops, succession of cultivation in definite order (8) 5. Sap-sucking insect that targets citrus and vines (8) 9. Snake’s poison (5) 10. Fleece of sheep (4) 11. On (a ship or train) (6) 12. Drought-tolerant plant of the Cistaceae family often used as ground cover14. Tree-dwelling (8) 17. Plant native to tropical and Southern Africa known locally as big num-num (5,4) 19. South African elk-like buck (5) 21. —chard is the edible leafstalk of a white beet variety (5) 22. Made of small threads; fibrous (7) 23. Earth (prefix) (5) 25. Subject to the twice-daily rise and fall of sea level (5) 27. Apparatus for heating by transmission through liquids or gases (9) 29. Relating to grazing land (8) 32. The voluntary taking of a child as one’s own (8) 33. Perches for sleeping birds (6) 34. Expanse of wild, uncultivated upland (4) 35. Tropical tree from whose seeds chocolate is made (5) 36. Blocks of rotting vegetation cut from bogs and used for fuel (4,4) 37. Causes to swell with air or a gas (8)
