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I've bought a bottle of concentrated tomato feed. The mix ratio is 25ml concentrate to 4L

I was hoping to mix a large amount in a tank and connect it to a gravity fed dripper irrigation system.

I can't work out if doing so will result in the fertilizer spoiling or encouraging mould / mildew growth in my tank.

Summary: What is the shelf life of diluted plant feed

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  • If your system is sterile, the diluted feed should last indefinitely. But it will be a free lunch for any microorganisms that can get in there (e.g. from air circulation), especially if the system is not lightproof. – alephzero Jul 15 '19 at 15:01
  • Whenever I've left a fertilizer/water solution it turns cloudy in a day or so. I think I'm seeing a practical demonstration of what @alephzero mentions. If you can't keep the solution sterile, it's big container of wet food for any opportunistic organism. – Tim Nevins Jul 15 '19 at 15:49

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