How Green Is My Spinach is Popeye's 169th cartoon, released in 1950 by Famous Studios. The cartoon in fact contains three title cards: How Green Is My Spinach, Popeye in Spinach Sockeroo and Popeye in Strictly from Spinach.
Popeye in Spinach Sockeroo: The second "story" has Bluto repeatedly punching Popeye against a wall until the contents of his spinach can fall into his mouth, enabling him to strike back and leaving his enemy's head encased in a cuckoo clock.
Popeye in Strictly From Spinach: Bluto shoots a tied-up yet unconcerned Popeye from a ship's cannon. Sucking his spinach with his pipe, he turns around, transforms into a missile and hits Bluto, sending him flying to be left hanging from the edge of the moon.At the end of this last vignette, Bluto begins to cry and lament Popeye's empowering usage of spinach, until he realizes that if the vegetable were to disappear, he could be rid of his foe. Next, he mixes various evil substances into a huge vat, the resulting chemical successfully killing a small spinach plant. He boards a small fighter plane and makes a devastating run over the spinach fields. As Popeye is helping repair a spinach-carrying wagon, Bluto flies by leaving his toxic mist to suck the truck's contents away. Through a nearby store window, Popeye and some children see a news report tell of the mysterious vanishing of spinach everywhere, and the children cheer.
Not even his trusty can is safe, as Bluto is nearby and sprays it with his noxious toxin. Unable to defeat his nemesis, Popeye runs into a supermarket that carries spinach, but it is likewise eliminated. The sailor has no choice but to try out other vegetables such as broccoli, carrots, cabbage, celery and potatoes - none giving him the strength to even hurt Bluto. The latter begins to sweep the floor with Popeye, rain down punches upon him and otherwise pummel him.
A narrator relays all of this to the concerned live-action audience of the theatrical cartoon, finally asking "Is there a can of spinach in the house?" A saddened boy checks the grocery bag he had brought to the movies and finds a can of the greens, then throws it into the screen to reach Popeye. Again empowered, the hero multiplies five-fold and punches his enemy, then uses him as a beast of burden to help seed the spinach fields again. The wonder veggie begins to grow immediately, cans and all.
- How Green Is My Spinach at the Internet Movie Database