Spring has Sprung

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Across
  1. 4. World-famous beach in Sydney, Australia
  2. 5. A flower for Summer lovers and Post Malone fans
  3. 11. Italian catchphrase, as well as a 1975 ABBA hit
  4. 12. Greek goddess of agriculture
  5. 14. Famous unibrowed artist
  6. 15. These bring May flowers
  7. 17. American singer-songwriter who claims that she is the problem
  8. 19. Celebrated on the second Sunday in May
Down
  1. 1. Billiards, for some
  2. 2. Hit the trail!
  3. 3. Shellfishness
  4. 6. A big fan of the Dutch
  5. 7. Usually worth the tassel
  6. 8. Shady park rotunda
  7. 9. The type of clouds that bring Summer showers
  8. 10. Natural wonder carved by the Colorado River
  9. 13. Hoppy Holidays
  10. 16. Composer of "The Graduation March"
  11. 18. A pirate's retreat