To make 1/4 strength....

If the directions are to add 1 teaspoon per gallon, you should add 1 teaspoon to 4 gallons. Then water your plants with this and dump the rest. Its easier than measuring 1/4 teaspoon.

If you dont want to waste ferts (like me), you could measure out teaspoon, spread it out on your desk, and use a credit card create 4 equal piles. (if you've ever done coke you'll be a pro!) Each pile will be 1/4 teaspoon. Add one of these piles to a gallon and you'll have 1/4 strength.

Hope this helps you out.

peace!