Bergman's Plant Food (Compound Fertilizer) observations SOIL GROW


It seems to me that the directions for it’s use could be a little bit more precise - because even with the chart from online what you will read concerning portions of each kind to use are very general.

The chart that describes weekly feedings for each stage may be more accurate for HYDRO growing, but I grow in SOIL and because of that a chart which tells me how many grams or teaspoons per gallon of water is perhaps interesting but not very informative. It does not tell me how much of the plant food each individual plant should be given. Below is the chart to which I am referring re-done so as to make it display well as a desktop background:

It suddenly occurred to me that if the set of plant food packets I got were for FIVE plants, and I were growing FIVE at a time (or however many) what I should probably do is to use a sensitive scale such as a kitchen scale that reads in grams to divide each packet of nutrients (AKA: “Nutes”) into however many parts were needed for the number of weeks the plants were to be fed. If growing fewer plants, I reasoned, I could sub-divide these amounts by five, and use each resulting measure for ONE PLANT EACH. Make sense so far?

Okay - when I set about this I noticed something else, and I checked it to be sure. Each of the separate packets in the set of four types of plant food have printed on the back the contents in grams and ounces that is the MINIMUM amount each packet must contain, but what I noticed was that each packet was in fact generously filled! By that I mean that at least by weight, they contain significantly more than what is required in order to completely ensure customer satisfaction. The packets containing Seedling Fertilizer, and Plant Boost (respectively) for example are marked as having a content of TEN Grams - but what I found when I carefully weighed them out was that there were EIGHTEEN grams in each approximately (Like I’m going to complain, ya know?)

*What I was doing was setting up small containers with measured doses ahead of time so I did not have to measure it out later

But what this means is that in measuring the exact quantity to give each plant or group of plants - it is necessary to first set up the scale and zero it for the container or paper you are measuring into and then carefuly and exactly measure an amount that matches what is printed on the back of the packet. This will result in extra 'Nutes that you can save to use next time, or later on in an extended grow, or whatever you want to do. Maybe use it with Clones, who knows?

The Flowertime Fertilizer is rated (on the packet) as 200 grams, or 7.05 oz, so what you want to do is measure that amount (and you will have a lot extra) into a container that you will divide into EIGHT portions - because of the eight weeks shown on the chart. By this means you arrive at the ideal amount for five plants once per week (at least in theory) without being thrown off by the generosity of ILGM/Robert Bergman. You can divide each of these portions by five if you need to get right down to the amount for an individual single plant.

The math here is simple: 200 grams divided by 8 equals 25 grams.
If you are putting it on only one plants - 25 grams divided by five is five grams…

The “Plant Boost” is used twice, contains (the packet says) 10 grams, so dividing by two you get 5 grams - therefore each plant ought to be fed ONE GRAM on the day of the week they are fed


Understand that, when growing in soil an amount per gallon is just about useless. What we want to know is how much each plant must have in total… Do you see it?

So a scale that reads in grams (which most of us have anyway) is your best friend there - you don’t need any measuring cups, just a sheet of paper to lay on the scale and some containers to put the measured amounts in or you can do the math each time and figure the precise grams of each Nute that you are working with at the moment, and keep the rest in the packets they came in

If you truly want accuracy, this is the best way to go

As shown, for seedlings divide by two, for veg phase divide by four, flower stage divide by eight, and for the booster by two.

Then factor in how many plants you’ve got

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Grams are shown if measuring your water in liters
Tsp is shown if you are measuring your water in gallons
As I read the chart this is what I see…
There are 5 ml per Tsp

If you use gallon/s you would simply fill up 1 Tsp leveled of and add to 1 gallon of water.
If you use liter simply use 1 gram or 1/5th of a Tsp per liter of water.

Just adjust amounts used going into water based on how much water you need to feed the plants. So if you have 4 plants and they need 1 gallon each when watering/feeding in flower you would add 4Tsp to 4 gallons of water and feed.

If you notice the difference in the amount on the chart between per liter and per gallon is roughly x4 used per gallon versus per liter because there are roughly 4 liters to a gallon.
I think you have over complicated things.
If you use liters instead you could basically use the amount shown per gallon if basing that on 4 liters. The difference between 4 liters and 1 gallon (3.8 liters to a gallon) is close but does get wider as you use larger amount of water needed to feed them all.
I don’t think the chart is meaning to weigh the nutrients but like in baking a cake to measure them using measuring spoons.

I could be wrong but that’s how I interpret the feed chart.

Hope this helps and HAGD
Again I could be wrong as I don’t use it.

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Think about it again in terms of how much of the NUTRIENTS the plants require - not how much to put in water. You can water all you want, but how much nute powder got delivered to the plant? Is it enough to go for an entire week? Is it too little, so that the plant did not get enough to work with?

I could seriously care less how many PPM in a litre or a gallon of water there is so long as the roots do not burn and the plants are not shocked. This is plant FOOD not fertilizer; and the amounts and feeding schedule are intended to be that quantity that each plant needs for/in a given length of time.

If I were to mix it by the gallon or litre following the chart as it is - my plants may only need one litre or less on that particular day, and for the rest of that week may be shorted the rest of the nutes that they needed to take in for optimum growth that week…

In fact, if I go strictly by that chart and the assumption that 1 gram of a given nute must be applied on a particular day - I more or less have to mix and apply TWO litres of water to the plant (or to EACH plant) just to keep the mixture in accord with the chart that we see.

But that could be far too much water at a single watering.

An alternative might be to use the charts mix - but pour it in once at the start of the week, and then again at mid-week at a rate of one litre each…

And so on and so on. The point being that the percentage in the water has nothing to do with the total quantity of nutes the plants actually receive

~ and pinning THAT down is my sole entire objective

By the way, in this as in cooking & baking, measuring by weight is far more accurate


It is close to the end of the fourth week of flower (oh and by the way I AM using this stuff) and there are smallish flowers everywhere like cotton balls on the plants. They have four more weeks to grow, and this is a grow that got off to a delayed start.

Next grow I’ll have it pinned down from the beginning and use the nutes on the sprouts as well

I have the biggest indoor plants I ever have so far, and as long as progress is made I’m happy


Meant to add this to the above, but edit time is too short

That is halfway through the flower stage - there are four weeks and a few days yet to go (grow)


Flower Stage Feeding #5 today (30 April 2019)
Three more feedings +1 week of growth to go
And then I will have whatever I did this time…

It’s like a game that you seldom lose, and always win big when you do

Here’s a kyewel desktop BG fer yew:

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