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Fertilizer Application Rate Calculator

I occasionally get emails from people who need some help figuring out how much of each organic fertilizer and microbial inoculant to use.

So - I've made you this fertilizer application rate calculator!

Choose your products, area and application frequency below and click 'Submit'. Cool right?

Feel free to ask questions down below...




Choose All Of Your Products












Choose Your Area

100 square feet (10 square meters)
250 square feet (25 square meters)
500 square feet (50 square meters)
1000 square feet (100 square meters)
2500 square feet (250 square meters)
5000 square feet (500 square meters)
1 acre
Plants in pots

Choose Your Application Frequency

Twice A Week
Once A Week
Every Other Week
Once A Month
4 Times A Year



I'm sure there are some things this calculator won't answer, so feel free to ask any questions down below.

Molasses For Plants – How To Use It In Your Garden

Molasses For Plants

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It sounds strange, but a can of Coke can actually be beneficial for the garden.

In fact, various forms of sugar are very useful to use in your foliar sprays.

If you’re applying any kind of microbial inoculant such as effective microorganisms or compost tea, the right sugar will give the microbes some food to eat right when they get out there, to wake them up and get them working away on all the amazing things they do for us.

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Best Hose End Sprayer For Organic Gardeners

You’ll definitely want a quality hose end sprayer if you’re going to be applying liquid organic fertilizers and inoculants. Hudson Hose End Sprayer Professional

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This is the metal trigger Hudson hose end sprayer, probably the best hose end sprayer on the market for home gardeners as long as your garden isn’t too big.

I used to carry the Gilmour hose end sprayer 362, but Gilmour has now stopped making hose end sprayers.

Luckily, I found this Hudson sprayer that as far as I can tell is exactly the same as the Gilmour – perhaps even made by the same manufacturer, but I’m not sure about that.

This is a professional hose end sprayer.

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Liquid Fish Fertilizer – For Whole Food Nutrition

Liquid Fish Fertilizer

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Canadians buy here

Along with seaweed, fish has been used as a fertilizer for centuries.

But where using fish as fertilizer has liquid seaweed beat is in the nutrients it contains, especially nitrogen (N) and phosphorus (P).

N and P are two important elements that are often deficient when our gardens aren’t yet up to a point of cycling nutrients optimally (which is most of the time).

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N-P-K Fertilizer – Overused, Yes, But Still Important

N-P-K Fertilizer

Important: I NO LONGER SELL THIS PRODUCT. It’s an excellent fertilizer, but people weren’t buying it much. I’m keeping this page here for historical purposes.

Conventional gardening uses too much N-P-K fertilizer.

And it does so at the expense of dozens of other nutrients that are really important.

Plus, the forms of nitrogen, phosphorus and potassium in N-P-K fertilizers are often harmful to the soil food web, especially triple superphosphate and potassium chloride.

BUT – that’s not to say that N-P-K isn’t important – it’s just that:

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Pure Neem Oil For Plants – The ‘Healthy’ Pesticide

Pure Neem Oil Bottle

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If you tend to buy healthy/organic/non-toxic versions of many household products, you may have seen ‘neem oil’ listed in the ingredients.

It’s used in formulations such as toothpaste and shampoo, or you may use a neem oil soap.

As a natural insecticide, fungicide and bactericide, people have been using neem for thousands of years.

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Sea Minerals Fertilizer – My Favorite Fertilizer

Sea Minerals Fertilizer

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Canadians buy here

If you’re lucky enough to live right beside the ocean, I’m envious of not only your view of the surf, but the incredible fertilizer you have at your doorstep.

Sea minerals fertilizer is definitely my favorite organic fertilizer. It has very noticeably improved the health and increased the growth and yield of many of my plants.

Rivers and volcanoes have been adding minerals to the sea for hundreds of millions of years, which is why it is so nutrient dense in there.

That’s what we need to emulate in our gardens.

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The Best Compost Tea Brewer On The Market

Compost Tea Brewer Bucket

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Canadians buy here

There are tens of thousands of different species of microorganisms that have a huge part to play in the health of your garden.

They kill diseases, feed and protect plants, improve the soil, and perform a long list of other jobs.

In 2006, I was running my organic gardening business and learning that my clients’ gardens were deficient in proper biology.

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Mycorrhizae For Sale – The Most Helpful Soil Inoculant

Mycorrhizae For Sale

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Canadians buy here

A common problem in many gardens is that plants have a difficult time:

  • Getting certain nutrients out of the soil
  • Finding enough water
  • Protecting themselves from soil-borne predators

That’s why they started partnering – 100s of millions of years ago – with very special fungi called mycorrhizal fungi.

If I had to narrow it down to the single most important microorganism species for your garden, it would be a mycorrhizal fungus called Glomus intraradices.

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