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whole teaspoon? In a 2 gallon pot? You wild-man! Seriously, dude, explain yourself.
Are you trying to ration a limited supply or something?? Worm castings, at least
good worm castings, are flat out gold in an organic grow, and I don't think you can ever really put too much. (Well, if you add them into your mix they can be kind of dense and in need of decent aeration, but when top dressing the more the merrier).
1 tsp per 2 gallons is like 1:1,787. I top dress with something like 4 Tbls/2oz in an 8 oz cup which is like 1:25 and is a layer about an inch thick covering the top. I then cover that with a top coat of mulch (leaf mold for me) and keep it moist. The root growth coming out of that castings layer is insane.
So, if you're rationing a short supply because you have to hunt it down in the forest or something, then more power to you. But, if you have an adequate supply, then splurge a little. Your girls will thank you.