What part of a vegetable can't you eat?
The wheelchair.
What part of a vegetable can't you eat?
The wheelchair.
Okay, so you got a vegetable that's lost its ability to walk. Now it needs a wheelchair to get around. The joke is that you can't eat the wheelchair, which is part of the vegetable's life now, but not part of the plant, dummy!
AverageOrphanJokeEnjoyer
Bet.