Sowing MicroGreen Trays With a Consistent Seeding Density - My View From The Woods

Sowing MicroGreen Trays With a Consistent Seeding Density

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Sowing seeds at a consistent density makes it easier for you to care for them as they sprout and grow. 

The easier it is to care for plants, the more time you have to grow and care for other plants.

To sow seeds at a consistent density, that is, each tray has the same number of seeds and thus plants when they sprout is to know how many seeds are in a given mass unit of weight. 

You could take the time to count every variety of seed you grow and weight them. But those seeds are damn small and it takes a lot of them to make a mass that is above the error of any reasonable priced digital scale.

Calculating Seeding Density the Smart Way

The internet is an amazing thing.

So are professional growers and high value seed companies who have already calculated how many seeds are in a unit mass, whether it be pounds, 1/4 pound, ounce, or gram.

Of course, there's variation in those numbers, depending on many things like cultivars, growers, and calculation methods. 

However, I've combined data from several growers, calculated an average, and present you with those calculations.

digital scale for seed density

Microgreen Seeds Per Gram

Use the button below to have a pdf delivered to your inbox that contains around 20 different microgreen varieties and an average number of seeds that a gram contains.

I will continue to add varieties to this pdf as well as revise the average whenever new data becomes available to me. Updates will be sent to you.

Click to to have the pdf sent to you.

Calculating a Seeding Density

The second part of the video below shows you how I determined my seeding density and deliver the right number of seeds to my planting tray.

What You Need to Find Your Ideal Seeding Density

The first, you'll need to take a guess. The trays I used are about 7 3/4 by 5-inches. Or 38.75 square inches.

I planted around 800 seeds in each tray (560 cilantro seeds). 

That's about 21 seeds per square inch of planting soil. 

Figure out how many square inches your planting trays are and multiple by 21 to get an idea of how many seeds you need.

Then use the pdf to find out how many seeds are in a gram of the variety you're planting and divide that number into the number of seeds your tray will hold.

An Example

The tray you have is 40 square inches and you want to plant collards.

Collards have around 258 seeds per gram (use the pdf).


40 sq-inches X 21 (my seeding density) is 840 seeds per tray.

840 seeds / 258 seeds/gram = 3.3 grams. 

Using 3.3-grams of collard seeds should give you a decent seeding density. And every time you plant collards the trays will the same.

pouring seeds


Take a digital scale (follow the link to see a good inexpensive scale) and a small container. Use the tare function to zero out the container and pour in 3.3-grams of collard seeds. 

Once you spread those seeds on the soil in your tray you should have a good seeding density for microgreens. 

What If The Density Is Wrong?

The first time is a bit of a guessing game. But now you have some solid numbers to use to modify your seeding density. If the density is too light (or poor germination rate) then you can up your weight the next time.

Too many seedings, lower your weight. Within a seeding or two you'll have your seeding numbers exactly where you want them. 

No more guessing.

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how to figure out seeding density for microgreens

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