Easy Plant Fertilizer for Houseplants

Residue from milk and juice containers, combined with a little water, makes great house plant fertilizer.

August/September 2009
By Joseph R. Heckman, Ph. D. 
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Empty milk jugs should be rinsed with tap water before recycling. Rather than pouring the rinse water down the drain, I use it as plant fertilizer on houseplants. The small amount of milk in the water has useful amounts of three main plant nutrients: nitrogen (N), phosphorous (P) and potassium (K).

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Because these nutrients are mostly present in organic forms, such as proteins, the nutrients are released slowly through the action of soil microorganisms. This slow release of nutrients provides for steady growth of houseplants.

I also use the rinse water from orange or apple juice containers. Juice is especially rich in potassium (K). The combination of nutrients from milk and juice provides a balance of N-P-K from natural sources. Since I’ve adopted this practice, I have found it unnecessary to use any other fertilizer on my houseplants.

Joseph R. Heckman, Ph. D.
Extension Specialist — Soil Fertility, Rutgers University
New Brunswick, New Jersey
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  • Juan Sebastián Estrada 7/14/2009 1:13:15 PM

    Great idea!. I'm curious, is it safe to use as foliar fertilizer? I assume the N, P, K concentrations are not high so it would be safe, but I thought I'd ask before applying it to my very sensitive orchids ;)

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