Cryptic nature

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Across
  1. 3. Shrub sounds like we must cover the warden
  2. 5. Bird of paradise displays ire at Liszt
Down
  1. 1. Hedges found in the bus he’s taking
  2. 2. Spiny plants start cracking as cold turns ice
  3. 4. Longing to see an evergreen tree
  4. 6. Rearranges sickly funeral flower