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How To Grow Amaranth Red Garnet Microgreens

Red Garnet

Amaranthus tricolor


Amaranth Red Garnet (Amaranthus tricolor L.) is a brilliant magenta microgreen praised for its beautiful appearance. It has an earthy slightly sweet flavor that complements both sweet and savory dishes but is most popular as a garnish.

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Quick Facts:

  •  Common Name: Amaranth Red Garnet

  •  Scientific Name: Amaranthus tricolor L.

  •  Other Names: Edible Amaranth, Joseph’s-coat

  •  Family Name: Amaranthaceae

  •  Flavor: Mild sweet, earthy flavor

  •  Seed Rate: 10g-15g per 10″ x 20″ tray

  •  Seeds Per in2: 0.05g-0.075g

  •  Avg. Yeild/1020 Tray: 150g

  •  Pre-Soak: No

  •  Weight Duration: 2-3 Days

  •  Germination Time: 2-3 Days

  •  Blackout Time: 2-3 Days

  •  Harvest Time: 8-12 Days

  •  Growing Difficulty: Hard

Did You Know


Photograph of Amaranth dulce de alegria

Dulce de alegria which is Spanish for “Sweets Of Joy” is a favorite indulgence in Mexico. It’s a candy-like treat made from popped amaranth mixed with honey and sugar.

Plant Details &

Grow Guide

How To Grow Amaranth Red Garnet Microgreens

Growing amaranth red garnet can sometimes be challenging as they’re a delicate microgreen which is rather picky about its watering and temperature needs.

The great thing about amaranth red garnet is that once you nail your method down you can start enjoying its incredible appearance and start adding them to your salads or using them as a garnish to make your dishes pop. So let’s get started!

Step 1 Preparing Your Amaranth Red Garnet Seeds

First, you need to measure your seeds using a scale. The best seeding rate for a 10″ × 20″ tray is 10-15 grams. If you plan to grow them in a 10″ × 10″ tray then simply divide the total amount by two, in this case, 5-8 grams.

If you’re a rebel like me you can just eyeball it without weighing, just make sure that your seeds are approx ⅛-¼” (3-6mm) apart.

Once you’ve measured out your seeds you do not need to wash and pre-soak them. This is because amaranth red garnet seeds are very small about 1mm in diameter, and wetting them will make it a nightmare to spread them evenly on your growing medium.

Step 2 Sowing Your Seeds

Fill your tray with your preferred medium, it can be soil, potting mix, coco coir, etc, leaving 1-2cm of empty space from the tray edge to the soil level.

Leaving a small space between the tray edge and grow medium helps when it comes to harvesting, minimizing the chance of digging into the medium with your knife.

Make sure you level your medium with your hands so it’s not clumpy, you don’t want your seeds grouping together when you sow them.

First, mist your medium with a spray bottle so it’s damp but not saturated, I recommend this because when you sow your seeds they won’t bounce around and instead stick to the medium.

Spread your seeds across the medium making sure they’re evenly spread out. Lastly, mist your seeds so they’re all covered with a fine mist of water.

Step 3 Germination & Weight Period

Grab an empty tray with no holes and place it on top of your sowed seeds. Lightly push the tray down with your hands to push the seeds into the growing medium.

You don’t need to add additional weight into the empty tray as amaranth is somewhat fragile, and an empty tray is enough weight on its own.

This helps the seed radicle to bury into the medium when it emerges. Without weight, the radicles have a tougher time digging into the growing medium and anchoring itself.

Keep in mind that the seeds will germinate while they’re covered and weighed down. A lot of people confuse the germination and weight period to be independent of one another and that you add them together, this is incorrect.

The germination time is there to give you an idea by what time the seeds will germinate, but you don’t add the germination time and blackout period together.

While your seeds are germinating and are weighed down you will need to keep your medium moist. You can do this by lightly misting your seeds every 12 hours, once in the morning and once at night.

Step 4 Blackout Time

After 2-3 days of weight period, the seeds should have germinated and the seedlings should now be lifting the empty tray. It’s now time to remove the weight and start the blackout period.

Take your empty tray and flip it upside down to create a blackout dome and place it back over your seeds.

Keeping them in the dark for another 1-2 days will force the freshly sprouted seedlings to stretch and search for light allowing them to get some height.

You can now start bottom watering your microgreens. To do this you simply add water to your bottom drain tray. I personally add 1 cup of water twice a day (every 12 hours), once in the morning and once in the evening.

When the 1-2 days of blackout time have passed you can remove the top tray/blackout dome and introduce your microgreens to light. I’ve found that 17 hours under lights and 7 hours with the lights off work well for me.

Grow your amaranth red garnet anywhere from 8-12 days, following with daily watering of 2 cups per day, once every 12 hours.

Step 5 Harvest

Harvesting your amaranth red garnet microgreens is easy and you only need a sharp knife. I personally love and recommend the Green Mercer Produce Knife . If you prefer using scissors then you can’t go wrong with these heavy duty scissors!

Just make sure your knife or scissors are not coming into contact with your soil while you’re cutting to avoid contaminating your crop with dirt.

Plant Details & Taxonomy

Very few plants can combine nutrition with beauty as wonderfully as A. tricolor. It’s an annual plant with a life cycle of 1 year. The seed weight of Amaranth Red Garnet ranges from 850-1700 seeds per gram.

The beautiful magenta color is what makes amaranth red garnet an excellent choice when grown as a microgreen or baby green. It grows best in hot weather and it does not tolerate and thrive in cold temperatures.

SOURCE: The botanical data and taxonomic details were acquired from the USDA Plants Database

Rank Scientific Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Caryophyllidae
Order Caryophyllales
Family Amaranthaceae – Amaranth family
Genus Amaranthus L. – pigweed
Species Amaranthus tricolour L.  – Joseph’s-coat
Common Names Red Amaranth, Edible Amaranth, Tampala, Joseph’s-coat, Ganges Amaranth, Elephant-head Amaranth

Microgreen Pests & Diseases

The following are the most common pests and diseases that can affect your microgreens.


White Mold – Sclerotinia sclerotiorum

Sclerotinia sclerotiorum is a necrotrophic fungal disease that causes what’s known as white mold, it can infect over 400 plant species worldwide. It’s also called cottony soft rot, stem rot, watery soft rot, crown rot, and seedling blight.

S. sclerotiorum key properties are its ability to create sclerotia which are its black resting structures, and mycelium which are the white fuzzy spiderweb-like growths you see on stems and growing medium.

microgreens suffering from damping off disease

Damping Off

Damping-off is an umbrella term that covers fungi and fungi-like organisms in several genera including Rhizoctonia, Botrytis, Phytophthora, and Fusarium, with the soil fungus Pythium being the often culprit.

Damping-off is a soil-borne fungal disease that affects seeds and seedlings typically by rotting of the stems and roots at and below the soil surface.

When a seed germinates the seedling will emerge fine but within 24 hours to a few days will become mushy and water-soaked, collapse at the base of the stem and die.

Aphids crawling on a plant stem

Aphids – Aphidoidea

Aphids suck! Quite literally. They’re soft-bodied insects that use their piercing-sucking mouths to feed on plants and there are over 4,000 aphid species in the world.

Other common names are greenflies, blackflies, and plant lice. They come in varying colors such as light green, black, white, brown, gray, or yellow.

When aphids feed on plants they secrete a sticky fluid which is called honeydew (no, don’t eat it). This goo they leave behind drips onto plants and can attract other pests such as ants. If the honeydew is left on leaves it can promote black sooty mold.

Amaranth Red Garnet Nutrition Facts

Amaranth Red Garnet is a fantastic source of vitamins, minerals, and amino acids. It’s rich in iron, vitamin A, vitamin C, vitamin K, calcium, manganese, magnesium, copper, and zinc.

Nutrition value per 100 g. (Source: USDA National Nutrient database)

PLEASE NOTE: Percent Daily Values are calculated based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

Principle Nutrient Value Unit RDA
Energy 23 Kcal 1%
Carbohydrates 0.33 g 0%
Protein 2.46 g 4%
Total Fat 2.46 g 4%
Cholesterol 0 mg 0%
Dietary Fiber 6.7 g 18%
Folate 85 µg 21%
Selenium, Se 0.9 µg 2%
Vitamin A 146 µg 195%
Vitamin B1 (Thiamin) 0.027 mg 2%
Vitamin B2 (Riboflavin) 0.158 mg 12%
Vitamin B3 (Niacin) 0.658 mg 4%
Vitamin B5 (Pantothenic acid) 0.064 mg 13%
Vitamin B-6 (Pyridoxin) 0.192 mg 15%
Vitamin C 43.3 mg 48%
Vitamin E 1.2 mg 8%
Vitamin K 1140 µg 950%
Sodium, Na 20 mg 1.33%
Potassium, K 611 mg 13.00%
Calcium, Ca 215 mg 21.50%
Copper, Cu 0.162 mg 18.00%
Iron, Fe 2.32 mg 29.00%
Magnesium, Mg 55 mg 13.41%
Manganese, Mn 0.885 mg 38.48%
Phosphorus, P 50 mg 7.14%
Zinc, Zn 0.9 mg 8.18%
β-Carotene, beta 0 µg 0.00%
α-Carotene, alpha 0 µg 0.00%
Lutein + zeaxanthin 0 µg 0.00%

Recommended Seed Providers

I highly recommend True Leaf Market and SeedsNow for all your seed needs. Their wide selection of high-quality seeds and exceptional customer service make them the go-to choice for both novice and experienced gardeners alike.

True Leaf Market

For over 45 years True Leaf Market has been a provider of high-quality seeds both GMO and NON-GMO organic seeds. They also provide phytosanitary certificates if you need to import seeds to a country outside of the US.


SeedsNow is a family-run company, with the aim of assisting individuals, families, and communities in preparing for the future through the promotion of an organic and self-sustainable lifestyle. All their seeds are completely free from any genetic modifications, making them heirlooms, open-pollinated (OP), raw, natural, and untreated. Additionally, they do provide a selection of hybrid varieties on their website which will be clearly labeled as such in the product listings.

Close up of Amaranth red garnet seeds

Buy Amaranth Red Garnet Microgreen Seeds

Amaranth Red Garnet (Amaranthus tricolor L.) is a brilliant magenta microgreen praised for its beautiful appearance. It has an earthy slightly sweet flavor that complements both sweet and savory dishes but is most popular as a garnish. Add a touch of freshness and a pop of color to your dishes by ordering Amaranth Red Garnet microgreen seeds today.

Recommended Products

Explore our top curated picks for products and places to buy from to grow microgreens. Rest assured that all the featured items and products have been meticulously put to the test by our team, or have received glowing recommendations from our esteemed readers.

Green Microgreens Growing Trays

Microgreen Grow Trays

For my personal home use, these microgreen trays are my go to. Measuring around 12.2 x 9.06 x 1.77 inches (31 x 23 x 4.5 cm), these trays are perfectly suited for cultivating microgreens in a home microgreen grow room. What’s more, they’re durable, and cleaning them is a walk in the park, making them an all-around convenient choice.

1020 Microgreen Trays - Shallow Extra Strength Colors

1020 Microgreen Trays – Shallow Extra Strength Colors

Industry leading BootStrap Farmers 1020 microgreen trays! Designed with long lasting durability in mind, these colorful trays are built to withstand years of use and abuse. With a height of 1¼ inches (3.2 cm), these shallow trays make harvests easy, saving you time and increasing your yield. The trays come equipped with 36 drainage holes that effectively remove excess water, promoting a healthy growing environment and preventing mold growth. If you’re serious about growing microgreens and want the best trays available on the market, these trays are it!

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