I was sitting out on the front porch admiring the Impatiens that Pam and I planted. What a blast of color! Then I thought about what I feed them.
Before I get into that, let’s do a fertilizer crash course. On a bag of fertilizer you will see three numbers like 12-12-12 or 18-6-4 or 5-36-5. Here’s what the numbers mean and what they mean to you as a gardener…
The first number is the percentage of nitrogen in that particular bag of fertilizer.
Plants need and love nitrogen, but like banana splits, too much of a good thing is not a good thing. So you have to make sure you are not putting too much nitrogen on any particular plant.
By the way, I like Banana Splits. Can you tell?
The second, or middle number, on a bag of fertilizer is phosphorous. Phosphorous is like an under-the-hood tune up for plants.
Phosphorous plays an important role by helping the plant absorb and use the nitrogen and other nutrients that a plant needs from the soil in order to be healthy and happy.
Phosphorous really aids in the photosynthesis process and essentially makes and keeps the plant healthy. Which means the plant will produce more flowers and fruit.
So basically, it takes the correct amount of phosphorous for plants to flower beautifully.
The third, or last number, on the bag of fertilizer is the percentage of Potassium in the fertilizer. Also called potash.
Potassium gives plants stamina because it helps plants absorb and use water. Usually there is plenty of potassium in the soil but much of it is not in a form that plants can absorb.
The potassium in a bag of fertilizer is water soluble and easily absorbed by plants. Potassium helps plants survive drought conditions because it helps the plant use water more efficiently.
So what does all that mean?
That means that you have to use the correct fertilizer for the particular plant you are fertilizing.
Fertilizer companies have made this easy for us. A lawn fertilizer has a very high amount of nitrogen because your grass grows a lot more than typical plants and grass needs, and will use, more nitrogen.
A garden fertilizer might have a formulation of 12-12-12 or 14-14-14. You can use either one… don’t get too caught up in the details.
But a garden fertilizer is meant to be applied to your garden before you plant and it releases those elements very quickly upon application.
It’s good for a bare garden but not so good for established plants in your landscape, unless used very sparingly.
Fertilizer companies make fertilizers for things like hanging baskets, that are really high in phosphorous, to help the plants make lots and lots of flowers.
What I use on the flowers in my beds is a product called Osmocote. Osmocote has a lot of different formulations but what I often use is the 14-14-14.
Don’t confuse Osmocote 14-14-14 with a garden fertilizer that says 14-14-14 on the label.
Osmocote is a coated fertilizer that is engineered to release it’s formula very slowly over a period of months. Unlike a garden fertilizer that releases fully in a matter of days.
Some Osmocote releases over 3-4 months. Some of the formulations take as long as 8 or 9 months to release.
I like the Osmocote 14-14-14 that releases over 3 to 4 months for my flower beds because I just sprinkle it over the bed after I plant my flowers and let it slowly feed the flowers all summer long.
Here’s an example of the slow release fertilizer I use in my potted plants at the nursery:
What about things like Miracle-Gro, do they work?
Yes, Miracle-Gro is a good product. The liquid formula releases very, very quickly but is safe when used as recommended. It’s a quick release but a safer form of nitrogen.
So even if you have fertilized your flowers with Osmocote slow release granular fertilizer, you won’t hurt a thing by giving them a little Miracle-Gro along the way.
Another brand name that I’ve used successfully on my flowers is Jack’s Classic Plant Food, formerly known as Peters liquid fertilizer.
And more recently I’ve started using a product called Florikan. It’s less expensive, has more micronutrients, and longer release period (140 days with average temps).
Okay! That’s a lot but I hope you find it informative and useful. Questions? Comments? Leave them below…