Liquid Herbs
A plant-based fertilizer formula
April/May 1998
By Heidi Herzberger
EVER SINCE I started gardening, I’ve been
improving and maintaining my soil to increase my yields of vigorous
herb plants with large, abundant leaves and high levels of
essential oils. Long before the term “recycling” became a
catchword, I was returning plant nutrients to the soil in the form
of homemade compost and cover crops that I tilled under. Over the
years, I’ve developed an organic liquid fertilizer that not only
makes herbs grow faster and stronger, but is actually made from
herbs.
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Something I learned from my parents and have always done is to
lay fresh-cut leaves and stems that I’ve weeded or pruned around
the base of my plants and wait for rain, microorganisms, and time
to release their nutrients to the soil. One winter day, while
sipping a restorative cup of herbal tea, the idea came to me that
my plants might also prefer their tonic in liquid form, a sort of
vegetarian manure tea based on a mixture of dried herbs.
I discovered that the practice of using herbs as fertilizer
dates back hundreds of years: as far back as the ninth century in
the case of comfrey, for example, and to the eleventh for raspberry
and dandelion. That’s really not surprising. Like all other green
plants, herbs surrender their nutrients to the soil when they
decompose.
The fertilizer formula I came up with contains twelve herbs,
listed below, which together contribute nitrogen, phosphorus,
potassium, and the ten other mineral elements essential for plant
growth along with numerous other beneficial substances. Many have
traditionally been used as fertilizers. Two of these herbs, tansy
and mint, have a reputation for attracting great numbers of
earthworms, which themselves are prodigious fertilizer
manufacturers. Most of these herbs are vigorous growers, so if you
have them in your garden, you probably have plenty to spare for
making fertilizer.
ß Tansy (Tanacetum vulgare)
ß Nettle (Urtica dioica)
ß Mint (Mentha spp.)
ß Hop (Humulus lupulus)
ß Comfrey (Symphytum officinale)
ß Leaves and fruit of raspberry (Rubus idaeus)
ß Dandelion (Taraxacum spp.)
ß Coltsfoot (Tussilago farfara)
ß Purple coneflower (Echinacea purpurea)
ß Soapwort (Saponaria officinalis)
ß Sage (Salvia officinalis)
ß Garlic (Allium sativum)
The results
I’ve tested my herbal fertilizer for three years, giving one
group of plants fertilizer, compost, and water while giving another
group of similar plants just compost and water. Large- and
small-scale growers also have used it, in greenhouses as well as
outdoors. We’ve all been pleased with the results.
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