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Will Synthetic Fertilizer Save If I Prepare Large Quantities at Once?

Since I grow many plants in containers, and because I use structured soils that lack nutrition, I have gone with @tapla (mid-Michigan, USDA z5b-6a)'s philosophy of "fertilize weakly, weekly". It gets a bit tiring to have to prepare around 16 gallons of water with dilute fertilizer each week. What are some tricks we can use to lower the amount of time needed to prepare synthetic fertilizer?

Could I use a rain barrel and prepare 64 gallons of water all at once? I could then serve out of the rain barrel to the watering can as needed, and the rain barrel would give me about a month of watering. Would the fertilizer stay usable for a month? I assume it might be important to keep the rain barrel in a shaded location, to prevent the plastic from leaching too much PVC into the water, so I could plan for that.

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