Ken from Reno writes
You did not state what product you are using but generally, you should not store mixed insecticide or herbicide concentrates for longer than 24 hours in the Miracle-Gro Garden Feeder or any sprayer. Concentrated products will begin to separate which can cause clogging and will also being to lose efficacy over time. We recommend mixing only what you intend to use and discarding any leftover solution.
Answer last updated on: 05/15/2019