Growing Amaranth Microgreens – An Easy Alternative Method

Red Garnet Amaranth microgreens are the most vibrant microgreen we grow. 

One could argue that Bull’s Blood Beets are just as bright and more widely known to most people. But the delicate, almost thread-like stems of amaranth and the earthy flavor they add make amaranth an ideal garnish to salads. 

how to grow red garnet amaranth

How to Grow Amaranth Microgreens

We published an article, How to Grow Amaranth Microgreens a little while ago using our standard microgreen growing method by placing a lid right on top of the seed, adding weight to the lid, and covering the whole tray with a towel to exclude light.

We are now calling this the Weight Method. 

However, occasionally, we ran into some problems with this method while growing amaranth microgreens.

Actually, there are a couple of problems.

One was a complete damping-off disease problem. This is where the seeds and seedlings turn to mush and produce a fungus.

The other, unique to Amaranth, I call it the spaghetti syndrome. Where the amaranth plants rapidly grow horizontally under the weight, so they look like a tray of spaghetti when you remove the cover. 

damping-off disease of microgreens
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Damping-off disease where the seeds and plants rot in place (image is not of amaranth).

Spaghetti syndrome of amaranth

What we call the Amaranth Spaghetti Syndrome. Where the plants grow horizontally and twist during the blackout.

Once the amaranth is compacted and twisted by the spaghetti syndrome, it never completely recovers, and the tray has a minimal harvest weight.

It’s Really the Growers’ Fault

Damping-off and the spaghetti syndrome aren’t a problem with the Weight Method of growing microgreens. It’s the growers’ fault for not checking the germinating microgreens often enough, adding too much moisture to the soil, placing the tray on a heat mat, or leaving the amaranth in the blackout period too long.

It’s not that you can’t grow amaranth using the Weight Method; it takes more diligence to care for the plants. The delicate, thin stems and root system of amaranth are susceptible to extra moisture and damping-off disease to begin with.

Those same thin stems don’t have the power that most microgreens have to push the weight upwards. So they snake and twist under the lid if not released from the burden of the load.

Hence, the spaghetti syndrome.

The Black Dome Method for Amaranth Microgreens

The alternative method we use to grow some microgreens, mainly mucilaginous seeds, is the Domed Method. 

The Black Dome Method still includes a blackout period; however, no weight is put on the seeds.

The Black Dome Method shows the versatility of the Home Microgreens Trays.

how to grow amaranth microgreens

Starting the Black Dome Method

The first four steps in the microgreen sowing process are the same as in the first Amaranth growing article.

Add soil, wet the soil, sprinkle on the seeds, and wet those down. These steps remain the same. 

So let’s pick it up the Black Dome Method in Step 5.

Step 5.

Instead of placing a lid upside down on the top of the seed, place the watering tray upside down on the planting tray.

home microgreens tray as a black out dome

Don’t worry about the soil or water coming out of the bottom of the planting tray. Here again, is the versatility of the Home Microgreens trays. Use one of the transparent lids as a tray for the bottom of the planting tray. 

shallow tray under the blackout dome

The shallow tray is just fine to catch a bit of soil and maybe a drop or two of water. By the time we need to bottom water, the dome won’t be required, and the Home Microgreens Black Out Dome turns back into the Home Microgreens Watering Tray.

We Use These Microgreen Trays

We use Bootstrap Farmer Shallow Heavy-duty trays to plant 1010 or 1020 trays. We also use their deeper trays to plant peas or other uses.

These trays will never be damaged with normal use.

Heavy-duty Trays

When we grow microgreens for ourselves, we use the Home Microgreens Trays & Soil. We like the amount of microgreens these trays grow, and we find we can either stagger plantings or double up trays to fit our microgreen needs.

Home Microgreens Trays

The dome excludes light but still retains moisture for the seeds to germinate. Since amaranth is a shallow rooting microgreen, and the microgreen itself is skinny, there’s no need to add weight to increase the vigor of the root system.

Step 6

Step 6 is the same; allow the seeds to germinate for 48 hours. Please don’t remove the dome; let it retain any moisture that may evaporate from the soil. 

Step 7

On Day 2, take a look at the amaranth seeds. You should see a few of them germinating and maybe a few growing. Amaranth seeds don’t germinate at the same time. Many lag behind.

Amaranth microgreens 2 days after sowing

After two days, some of the seeds should have germinated. Others will take longer. Place the blackout dome back on top and check back every day.

Place the blackout dome back on top and check them every day. Unlike the Weighted Method, a quick check of the seeds by removing the dome won’t upset the tender roots. 

However, don’t let too much moisture escape. 

Amaranth Microgreens Day 3

Below is the same tray one day later.

Amaranth microgreens on Day 3

Many more of the seeds have germinated! But it still isn’t time to water or remove the blackout dome. Check for any fungus or mold. There will be white root hairs, so don’t mistake the latter for mold.

Ready to Try Your Hand at Growing Microgreens?

The Home Microgreen Trays and soil are versatile and inexpensive. Give them a try; besides amaranth, the Home Microgreens Store has 60 varieties of seeds pre-packaged from the HM tray, or you can buy seeds by ounce or even larger bags.

Amaranth plants are sensitive to wetness, so when you remove the cover, try not to let the condensation pour onto the plants if you can help it.

Check for any mold or fungus every day from now on. If the plants look good, but the blackout dome back on and check them tomorrow. 

If you notice some mold (be sure it isn’t root hairs), remove the top and place the tray in an area with ventilation or air movement.

A light mist of food-grade hydrogen peroxide may help if there’s an area of mold. 

Amaranth Microgreens Day 12

That’s right, this tray of amaranth microgreens when 12 days under the blackout dome. Notice how uniform and erect these microgreens are. The blackout dome helps slow-growing plants to get some height. 

amaranth microgreens day 12 ready to take out of the blackout

We left these Amaranth microgreens under the blackout dome for 12 days. It isn’t necessary to keep them under blackout that long. You can remove the dome when they reach an inch or more in height.

You could’ve removed these microgreens from the blackout from Day 6 or 7 if you wanted. Play it by ear and experiment with how you like your Amaranth microgreens. 

The key is to pay attention to moisture levels. The moisture will depend on how much you wet the soil during sowing and the humidity of the area you are growing them. The hotter and warmer, the quicker the amaranth will grow.

The sooner you remove the microgreens from the blackout period, the more leaf mass will form on the plants. I prefer smaller, brighter red, amaranth microgreens.

Step 8

Place the tray of amaranth microgreens under an LED light or on a window sill. Amaranth doesn’t need much light, but the leaves will have less green pigment and brighter red color if the light intensity is stronger. 

Step 9

Once the microgreens have been removed from the blackout dome, you can bottom water, as explained in the first article.

Step 10

Ready for harvest!

Amaranth Microgreens Day 21

These amaranth microgreens are ready to be harvested. In fact, they could’ve been harvested much sooner, but as you can see, they have a long shelf life in the Home Microgreens Trays (click image to expand).

Amaranth microgreens ready for harvest

Day 21 – This is how we like Amaranth microgreens with smaller leaves.

amaranth microgreens day 21

Amaranth microgreens have such beautiful stem colors.

Amaranth microgreens can be grown by either the Weight or Blackout Dome method. We have found that the more microgreens we grow, the harder it is to stay on top of their needs.

Therefore, we have switched to the Blackout Dome Method to grow Amaranth microgreens. The method is more forgiving, and checking on the growth using the dome is quicker.

What Method Do You Prefer? Weight or Blackout Dome Method?

Let us know by leaving a comment below what method you have tried and what your success has been

We love to hear from our readers!

If you have any questions about the information in this post or microgreens, please comment below or reach out to me using the Ask a Question page

Leaving a comment or using the Ask a Question page does not add your email to any mailing or marketing list. 


  • Todd

    Todd is the founder of Home Microgreens & the Home Microgreens store. He also writes for several other websites, including MyViewFromTheWoods.com. Todd worked at a large farm market, garden & nursery center for 20 years. Somehow he snuck off to become a geologist and professor before coming back to his senses to write & lecture about microgreens and gardening. When not at the computer, he can be found in the garden, trout stream, or mountain trail with his new Springer Spaniel Caden.

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4 thoughts on “Growing Amaranth Microgreens – An Easy Alternative Method”

  1. Hi Todd
    I grown all my microgreens with the dome method and have for the start so its great to know that I.m doing something right!

  2. Glad it’s working for you! Jenny, have you tried to add weight to micros such as radish, peas, sunflowers, or kale? We find we get better germination. But hey, if doming works for you stick with it!

  3. I’ve never felt the need, my inverted cat litter trays have worked well for me so far for all the greens I grow ie radish, broccoli, mustard, rocket, red cabbage, pea shoots etc

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