CREATE TABLE table_73557 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( in millions ) " TEXT)

What is the original air date when 'poison ivy' is the title?
SELECT "Original air date" FROM table_73557 WHERE "Title" = 'Poison Ivy'
SELECT "Original air date" FROM "table_73557" WHERE "Title" = 'Poison Ivy'