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Peter Bowden, the most well-known gardener in the Capital Region
of New York, has been writing gardening articles since the mid 1980's.
Over 20 years of experience in the retail garden center industry as well
as a life-long love of gardening make Peter's anecdotes worth the read,
every time. Not only are these articles filled with pertinent information
for the North American gardener, they are also packed with amusing
stories, crammed with societal insights, and peppered with poignant points
of practical procedures for the home gardener.
March 7, 2000: Understanding Fertilizer I
You can tell that spring is just around the corner
when you hear reports that the Stockade is threatened with flooding.
Last week’s thaw really brought home the idea that spring is
actually out there somewhere and its only a matter of time before it arrives
in our neck of the woods. Even
though I’ve lived here for 35 years, I’m still amazed by how quickly two
and a half feet of snow can disappear.
Last week’s thaw was a treat and it looks like the “mud season”
is upon us (and you thought we only had four seasons).
When I was leaving for work this morning, I
noticed some tulips starting to poke up their way up through the cold soil.
They’re fairly close to the foundation so that’s not too
surprising. I have to resist
the urge to remove my protective layer of evergreen boughs from the
perennial beds. On early warm
days it’s easy to get fooled into believing that spring is here.
We’re not done with freezing weather yet! By keeping the beds shaded, I’m insuring that the plants
will remain dormant through any “false
spring” weather that occurs. Early
spring weather with its freeze/thaw, freeze/thaw tendency is the reason I
cover the beds to begin with. The
hard part is resisting the urge to uncover early.
With any luck at all, we’ll want to get out
into our yards in a month or so and start our early feedings of shrubs,
trees, lawns and flowerbeds. But, what the heck with?
For the next couple of issues (before we can actually get out there
and actually feed anything) I’m going to explain a bit about fertilizer.
Regular readers will have to bear with me on this.
You’ve seen this before but you may benefit from a refresher too.
The first step is to get a handle on those three mysterious numbers
on all fertilizer bags. You
have noticed them haven’t you? You
may be familiar with 5-10-5; the most common vegetable food.
By law, the numbers represent the percentage, BY WEIGHT of nitrogen
(N), phosphorus (P) and potassium (K) respectively.
“WAIT A MINUTE” you say, “if the 5 the 10 and the 5 are
percentages, they only add up to 20% of the bag.”
I gotta tell you, you’re really on the ball.
Guess what, the rest of the bag is filler! The filler is in there to “make the product easier to
spread evenly without burning” as the manufacturers will tell you.
This is all true but, the ability to adjust the amount of filler vs.
nutrients is a device fertilizer producers can manipulate to make a lower
quality appear better than it is but, more about that later.
Anyway, the first number, N, or nitrogen shows
how much of the fertilizer is devoted to green, upward growth.
The second number P, or phosphorus, shows how much is devoted to root
growth and flower & fruit production.
The last number K, or potassium is an overall building block that
benefits all parts of the plant. The
easiest way that I’ve found to remember this relationship is: UP-DOWN- ALL
AROUND. As illustrated. This is
an easy way to remember the relationship between the three basic plant
nutrients. More on this next week.
Thanks for the read.

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