Harbingers

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Across
  1. 4. Late bloomer, for us
  2. 5. Common singer
  3. 7. Florid arbor
  4. 9. Leaves for spring
  5. 11. Declutterer
  6. 12. Trekker's home
  7. 16. Plant accelerator
  8. 17. Hidden until the end
  9. 19. Not wester
  10. 21. Gets the worm
  11. 22. Made an early exit?
  12. 23. Cecil's best
Down
  1. 1. Swoops down for lunch
  2. 2. Leaven buster or mystic's pyre
  3. 3. Early, not earliest
  4. 6. A matter of degree
  5. 8. Colorful acid-lover
  6. 10. Prolific annoyance
  7. 13. Schubert's cold cycle
  8. 14. Central avenue?
  9. 15. "Porcine" digger
  10. 18. Seed's dream
  11. 20. Earliest of the harbingers