Alright, let me tell you about my little adventure with this 20-20-20 fertilizer. I’d been hearing bits and pieces about it, you know, how it’s a good all-rounder. My plants, some of them, were looking a bit… meh. Not terrible, but not exactly thriving either. So, I figured, why not give it a whirl?
Getting Started with the Blue Stuff
First thing, I went down to the local garden store. Found a bag of the 20-20-20 pretty easily – it’s usually this bright blue powder. The numbers, 20-20-20, basically mean it’s got a balanced whack of the main things plants need: Nitrogen for leafy growth, Phosphorus for roots and flowers, and Potassium for overall plant health. Sounded like just what my mixed bunch of plants could use.

I got home, and like a good gardener (sometimes!), I actually glanced at the instructions. They usually tell you how much to mix with water. This is important, folks! Too much and you can burn your plants, and nobody wants that. I learned that the hard way a long time ago with a different fertilizer, believe me.
Mixing and Applying
So, I grabbed my trusty old watering can. The instructions said something like one tablespoon per gallon of water for outdoor plants, a bit less for houseplants. I measured it out – didn’t want to wing it with this stuff. It dissolves pretty quick in water, turning it that same bright blue. Kinda looks like a sports drink for plants, ha!
I started with my outdoor container plants first. My petunias were looking a bit sad, and the herbs on the patio weren’t as bushy as I’d like. I just watered them with the blue mixture, making sure to soak the soil around the base of each plant. I avoided splashing it all over the leaves, though some folks do foliar feeding with it (spraying on leaves), but I prefer to go straight to the roots for this kind of fertilizer.
Then I did a weaker mix for some of my indoor plants that seemed a bit sluggish. You gotta be more careful with indoor fellas, their roots are cooped up in pots.
Watching and Waiting – The Results
Now, fertilizer isn’t magic, it doesn’t work overnight. I waited. After about a week, I started noticing some changes. The leaves on my petunias seemed a bit greener, a bit more perky. My basil plant, which was looking a little yellow, started to get its nice deep green color back.
Over the next couple of weeks, the difference was more noticeable.
- My flowering annuals definitely put on more blooms.
- Vegetable starts in my raised beds seemed to get a good boost.
- Even some of my houseplants that had been static for ages showed a bit of new growth.
It was pretty satisfying, I gotta say. The balanced nature of it seemed to agree with a wide variety of my plants. It wasn’t like one specific thing was targeted; it was more like an overall health tonic for them.

What I Reckon Now
So, what’s my take on the 20-20-20? It’s a solid, reliable choice if you’re looking for a general-purpose fertilizer. It’s easy to use, dissolves well, and most plants seem to respond positively if you follow the directions.
I wouldn’t use it every single time I water, maybe every 2-4 weeks during the growing season, depending on the plant. You still gotta watch your plants, see what they need. Sometimes they might need something more specific, but as a regular feed to keep things ticking along nicely, this 20-20-20 has earned a spot on my garden shelf. It’s a good workhorse, that’s for sure. Just remember to mix it right and don’t go overboard!