Spades is the trump card in the game of spades. The more spades in your hand, the better odds of winning the game.
Spades is the highest suit in contract bridge, and many other card games where suits are ranked. (Clubs, diamonds, hearts, spades.) It is the most powerful suit, and the relation to winning decisively is a logical extension.
The adverb: in spades is used to express "To excess, a lot, considerably; without restraint."
Such as "Last year we had almost no potatoes, but this year we're getting them in spades."
It5 also can mean "Beyond doubt".
Good answer, but I don't think "in spades" works well in horticulture. How 'bout this one: "Last year...no potatoes, but this year we're getting them in (bushels)."
I think it refers to the value of David Spade. Which is, not worth much.
Hey, I love David.