maybe i'd use it later that day or on some other plants that need it but it's not advised to store most fertilizer once you mix em in water.

question, spike. how much water does each plant get that it dires up so quickly. The miracle grow is very strong chemically and the salts left behind by the plant can get to critical levels so it's important to see how much chems you're putting in the 1 gallon pails and the smaller peat pots. It's un-good to have too much ferterlizer and/or byproducts.

Good Luck