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Garden Betty

those 3 numbers on fertilizers? they're not what you think 🧐


Every gardener has heard of NPK, and you probably learned a while ago that it stands for nitrogen, phosphorus, and potassium—the three essential nutrients that plants need to grow.

Yeah, that's what I used to think too.

But I realized (after emailing a major fertilizer brand's customer service to clarify something) that even the reps are giving out false information about what those three values really mean! 🙀

N is certainly nitrogen. But P and K are are not exactly phosphorus and potassium, respectively, and it's important to know if you're trying to figure out how much of those nutrients to add to your garden.

So I'm diving into a bit of a geeky article to share the facts (and go against what all the other gardening sites are merely repeating without actually looking into it—because they're wrong).

This is what NPK actually means, why the ratio is helpful to know, and how you can save money on fertilizer.

What To Do When There's Too Much Nitrogen in Your Soil

The No-Dig Garden Method: Make Amazing Soil With Less Work

Tomatoes Not Turning Red? 4 Reasons Why and What To Do

5 Super Early-Blooming Bulbs That Don't Care If It's Still Winter

What Happens When a Chicken Molts (A Visual Guide)

How to Help Your Chickens Grow Back Beautiful Feathers

P.S. Surprise—the NPK ratio on a fertilizer label doesn't actually indicate phosphorus and potassium. Here's what it DOES mean, and why it's important to know.

P.P.S. You can start building great soil in fall—and for very little money. (I made all my own soil a few years ago for my raised beds and this is the best, loamiest soil I've ever had. 🪱)

Learn my method in my online course Lazy Gardening Academy.​

Garden Betty

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