Plants

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Across
  1. 2. tree with 'helicopter' seeds (8)
  2. 5. tallest trees (7)
  3. 7. colour changing flower, depending on pH
  4. 8. one with syrupy sap (5)
  5. 10. common furniture material (3)
  6. 11. where conkers come from (5,8)
  7. 12. ____wood studios (4)
  8. 13. made into a chain (5)
Down
  1. 1. given to a loved one (4)
  2. 3. used to soothe sunburn (4,4)
  3. 4. a frog's pad
  4. 6. many petaled solar (9)
  5. 9. red petals seen often at Christmas