Turnip the difficulty!

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Across
  1. 3. Green squash-like vegetable with wrinkled skin and mild taste
  2. 5. Peppery leafy green also called rocket in the UK
  3. 6. Leafy green also known as Swiss ___, with colorful stems
  4. 8. Leafy vegetable often forced in darkness to reduce bitterness
  5. 9. Peppery aquatic leafy green often used in soups and salads
  6. 14. Sometimes used as insult
  7. 15. Brassica vegetable whose name comes from the Italian word for “little arms”
  8. 17. Large mild radish commonly used in Japanese cooking
  9. 19. Aromatic vegetable whose bulb, stalk, and seeds are all edible and licorice-scented
  10. 20. Also used as an insult
  11. 21. Vegetable known for its mucilaginous texture when cooked
Down
  1. 1. Tropical starchy root also known as yuca, base of tapioca
  2. 2. Young onion also known as green onion or spring onion
  3. 4. Brassica vegetable meaning “cabbage turnip” in German
  4. 7. Knobbly root also called celery root
  5. 9. Long slender green bean variety with a pale yellow “waxy” exterior
  6. 10. Broad-leafed chicory often used in Italian soups
  7. 11. Root vegetable sometimes called “oyster plant” for its subtle flavour
  8. 12. Perfect vision
  9. 13. Asian brassica with crisp white stalks and dark green leaves
  10. 16. Lettuce variety central to Caesar salad tradition
  11. 18. Starchy root used widely in Polynesian and Asian cuisine
  12. 22. Bitter red chicory often grilled or used in salads