It turns out that we have some Irish in our lineage (about 20% they say), so as one of my oldest sons played his bag pipe I thought to myself… hey! We should offer a 20% off sale on our seeds in honor of our Irish heritage and the work that St. Patrick did to influence his world for the better those many years ago!
Why you should be growing your own arugula instead of buying from the grocery store or Big-Box Retailer
You know how you go to a fancy restaurant and they bring you your salad course and before they leave your table they offer fresh pepper for your salad and with your permission proceed to grind cracked pepper onto your salad? Think of arugula as your cracked pepper of the salad world.
Why Grow Arugula and How To Use It
I wanted to feature Arugula, because I just don’t think people understand how versatile this plant truly is and that it is beneficial in so many ways. It is chalk-full of beneficial nutrients (which we will cover later in case you wanted to know) while also being low in calories.
It is ideal for new home gardeners in building confidence of gardening skills as it grows quickly from seed (aptly nicknamed “Salad Rocket” in some countries) and can begun to be harvested off of and tossed into salads with other greens when the leaves are still young and small at 2″-3″ in length. (Note: If you leave the center 3-4 leaves, it will continue to produce as a cut-and-come-again plant.) Arugula is often found in the produce aisle in salad greens mix and called “mesclun”.
Mature Full-Grown Leaves and How to Use Them
I as a mother of five know that life can get busy, so if you fall behind on harvesting leaves when small and the plant gets more mature, that’s okay! It will be “spicier” or “peppery” in taste as a mature plant. Take these 6″-8″ long leaves and slice them from tip to base into 1/4″ or thinner strips and sprinkle over your salad or mix in (think of it like your freshly ground peppercorn). Diced leaves can even be added to dishes that call for cilantro or parsley, or mixed into pastas, side dishes, put on top of sandwiches, in wraps and/or added to soups. Its flavor compliments goat cheese, balsamic vinaigrette, tomatoes, olive oil and garlic, making it perfect to blend into dips or spreads.
Arugula can also be added to your basil pesto as added flavor or if you like the peppery flavor, you can substitute arugula in place of basil and make an entire pesto out of arugula leaves. We like this happy medium of a pesto recipe in particular over at PCOSbites. It’s great if you are looking for something that isn’t the same ol’ pesto recipe, but full of nutrients while still tasting delicious. We think of it as the new “elderberry syrup” as an immune-boosting meal for our family.
We also love to add arugula baby leaves to our sun-dried tomato, goat cheese, and pine nut mini pizzas! The kids don’t bat an eye-lash at the greens on their personalized pizzas because these taste so good!
Mature leaves can also be cooked or sautéed much like you would cook collards. With a TBSP of sherry, soy sauce, minced garlic, and vegetable oil + 1/2 tsp of salt and granulated sugar you can have a quick healthy side dish to accompany your sun-dried tomato mozzarella chicken. YUM!
If you don’t plan on eating a salad and just want to move it out of your system to put something else in, simply clean harvested leaves with water and pat dry with paper towels and spread out on a dehydrator. Dehydrate at 110ºF for 6 hrs until it breaks crisp (no moisture left in leaves.) Do not crush leaves, but place in a glass jar with an oxygen absorber and put in your spice and seasoning cabinet. When a recipe calls for pepper or if you’re making a soup, simply add in your dried arugula. BAM! (As Emeril would say…) or YUMMO! (As Rachel Ray would say…) You will get a hint of that pepper flavor as well as all the amazing nutrients that this little power-packed leaf holds.
Tip: After you dehydrate your arugula, don’t crush the leaves. Store the leaves as one piece as much as possible. When you “crush” or break up the leaves, it releases the flavonoids and other beneficial nutrients. We want those to stay in tack until we are ready to consume it in our cooking, so I always encourage folks to hold off crushing your leaves for this reason. This is also why you may notice your home-grown herbs and spices have so much more flavor than the crushed and processed ones from the grocery store.
—Erin Castillo, Owner Grow Your Health Gardening and GYHG Seed Co.
Nutritional Benefits You’ll Get from Eating Arugula
So, we’ve covered how to use arugula. Let’s briefly touch on why you should be eating this green. According to the USDA, a half cup (approximately 10 grams) of raw arugula has about:
0.4 gram carbohydrates
0.3 gram protein
0.1 gram fat
0.2 gram fiber
10.9 micrograms vitamin K (14 percent DV)
237 international units vitamin A (5 percent DV)
1.5 milligrams vitamin C (2 percent DV)
9.7 micrograms folate (2 percent DV)
16 milligrams calcium (2 percent DV)
In addition, this leafy green contains some iron, magnesium, phosphorus, potassium and choline. It also is rich in phytonutrients offering 1,424 mg of Beto-Carotene B
Did you know that one cup of Arugula can meet over a quarter of the daily recommended value of Vitamin K? Vitamin K is essential to blood clot formation and bone formation. Some researchers even believe that vitamin K may be a key factor in bone development, more so than calcium. I want my children to have strong bones as they grow and I encourage them to eat salads daily. One way to help provide their bodies with what they need is to mix in some arugula into their daily salad.
Tip: If you’re having difficulty getting your children to eat greens, involve them in the growing process. Give them a garden that is completely their own area to tend and help them grow plants from seed. As they feel more connected to their food, their natural curiosity will kick-in and they will willingly try the food they have patiently waited for to grow.
—Erin Castillo, Owner Grow Your Health Gardening and GYHG Seed Co.
How to Grow Arugula in a Hydroponic System
In this article, I’ll focus on growing it hydroponically, because that’s my preferred method of growing, but a lot of the same tips can be applied to growing in soil.
You can grow arugula in any hydroponic or aeroponic system. In a vertical garden growing system like the Tower Garden or Farm Stand, you’ll want to place this plant towards the top as you will most likely be harvesting from it continuously and keeping the plant size small.
Starting your arugula from seed: Choosing your arugula variety
If you’re growing in a hydroponic / aeroponic system, we strongly recommend you opt of seed that has already adapted to these growing conditions. Can seed from soil-grown parent plants grow hydroponically? Absolutely, but plants adapt epigenetically each growing season, so you’ll have a stronger healthier plant if you start out right with seed that has already adapted to the growing conditions you want to match. According to growers at the Seed Savers Exchange, seed DNA can hold 5+ years of growing seasons in which it can tap to survive and thrive. Choosing your seed stock source is more important than most realize.
Our arugula seed has been grown outdoors in the cool season of the Southeast in Zone 7 (not mentioning the zone here because it’s a perennial, but to help you get an idea of where the seed is grown so you can best match it to your own growing conditions.) GYHG Seed Co arugula seed can handle heat and humidity to a point before it bolts, but definitely plan on growing this during the cool season and start your seedlings 2 weeks before your last average frost date with the intention to move it outdoors as a transplant.
How many plants should you plant:
If you are wanting arugula on hand to pick fresh and mix into salads, I recommend planting four plants on a rotation (see below charts.) Place in upper level of Tower Garden or Farm Stand.
This is also a seed that you will want to plant on a continual basis on a four to five week cycle, so if you don’t have a Seed Starting Station set up already, you will want to read up about how to get one set up here. We recommend to plant four plants and keep them in your upper level of your Tower Garden or Farm Stand vertical garden growing system.
Start 2 rockwool cubes
Nurture Week 1 seeds
Start 2 rockwool cubes
Nurture Week 3 seeds
Start 2 rockwool cubes
Transplant Week 1 Seedlings into TG
Transplant Week 3 Seedlings into TG
Harvest baby leaves
Harvest baby leaves
Copyright 2021 Grow Your Health Gardening
Nurture Week 5 seeds
Start 2 rockwool cubes
Nurture Week 7 seeds
Start 2 rockwool cubes
Nurture Week 9 seeds
Pull Week 1 Plants. Transplant Week 5 Seedlings into TG
Pull Week 3 Plants. Transplant Week 7 Seedlings into TG
Continue pattern of pulling older plants and transplanting seedlings
Outdoor planting in a hydroponics system: If planting in the spring, you will want to start your seeds indoors or in a greenhouse so that your seedling start will be about two to three weeks old by the time your last spring frost date rolls around. If planting in the fall, you’ll want to factor in your harvest date range and count backwards 4-6 weeks from your frost date.
Arugula likes to live around 45° to 65°F (10-18°C). Plant arugula so that it comes to harvest in cool weather. It may fail to germinate if it’s too warm. Use a UV light system of some sort to grow your seedlings indoors keeping the light source 8″-12″ if LEDs and 5″-6″ away from seedlings if fluorescent lighting.
How many seeds to plant per rock wool: We recommend planting about 3-5 seeds per rock wool cube. Arugula typically germinates within 4-8 days. Be sure to use seed that is packaged for the current growing season as it will aide your ability to germinate the seeds. You can always remove any excess seedlings down to two plants as the plants mature if you are concerned about crowding. Our philosophy is start out with more and thin down as needed (but don’t toss those microgreens you pull — they are healthy for you to eat as micro-greens).
How much nutrients you should give your seedlings: Keep rockwool moist to the touch but not drenched. When you see a sprout, you can add a tsp of kelp to your water and water the young seedlings while giving them bright light from a grow light.
Thinning out your seedling starts: As the seeds germinate and grow, you will want to pull (or also called “thin out”) the weaker seedlings from the rock wool. (Remember, this is not a wasted plant — you can simply enjoy eating it as a microgreen.) You will want to leave leave 1-2 plants per rock wool to grow to maturity.
Transplanting your seedlings into your hydroponic system: Seedlings should be ready to transplant to your Tower Garden or hydroponic system about 2–3 weeks after sprouting. Seedlings plants should be about 1-2 inches tall, with 3-4 true leaves, before they are ready to leave the nest and enter into the hydroponic / aeroponic Tower Garden or other related system.
Finally, remember that arugula plantings should be staggered in roughly 2-3 week intervals in order to ensure a continuous harvest. If doing a spring planting, your growing season will be longer than a fall planting. You can extend your fall outdoor planting season by adding a professional grade heater to your Tower Garden reservoir keeping water temps in the 50-65º F range for the root zone to continue to uptake nutrients — just be sure to cover your Tower Garden outside with a weather protection blanket like this when freeze warnings appear.
Nutrient levels for optimal growth throughout the growing season for arugula:
Nutrients: EC: 0.8 – 1.2 (We recommend Tower Tonic Mineral Blend™ for a well-balanced nutrient solution to feed your plants the proper N-K-P and micro-nutrients. You can purchase a 1 gallon set of Part A and Part B here.)
PPM: 560 – 840 (We recommend Tower Tonic Mineral Blend™ for a well-balanced nutrient solution to feed your plants the proper N-K-P and micro-nutrients. You can purchase a 1 gallon set of Part A and Part B here.)
pH: 5.5-6.2 (pH is essential to help the plant uptake nutrients.)
Light: (Amount of sun or light exposure throughout the day) Hydroponic arugula should get between 10 and 14 hours of light per day.
Arugula Temp Tips: (Root zone temp is essential to help the plant uptake nutrients)
Maximum Temp 75º Degrees Fahrenheit
Optimal Day CycleTemp 65º – 70º Fahrenheit
Optimal Night CycleTemp 60º – 65º Fahrenheit (Note: arugula can handle some frost so long as the root zone stays above 50ºF, so use a water heater in your reservoir if you want to try pushing the limits on it growing in the cold.)
Seed Storage 40º to 70º degrees Fahrenheit
Germination 60º to 75º degrees Fahrenheit
SOIL Growers: Note — Do not grow in soil with pole beans or strawberries. Good companion plants are bush beans, celery, carrots, nasturtium, mint, dill, lettuce, cucumbers, onions, rosemary, potatoes
HYDROPONIC Growers: See first chart on Cool Season Plants on this page for reference of what grows well at similar PPM ranges and pH ranges in a hydroponic / aeroponic system.
Harvesting your arugula:
Make a note of how many days to maturation on the variety of arugula you are planting and mark your calendar or in your gardening journal. When your plants have reached the baby leaf stage, take a sanitized clean pair of hand trimmers or scissors and cut the outer leaves of your arugula plant, leaving at minimum three center leaves to continue to grow. The plant will continue to produce leaves for you but will become spicier as the plant matures. If you don’t want spicier leaves, simply pull the mature plant at 5-6 weeks of age and replace the plant with a new transplant (see chart above). Ideally, your arugula should be eaten within a few hours of harvest; however, if storage is necessary, the correct conditions to prolong shelf life are rapid cooling down to 34°F (we accomplish this with an ice bath of water) and then spin the leaves dry and place between dry paper towels in a sealed lettuce container with and 95-98% percent humidity.
How to store arugula that is not consumed right away:
If you have more arugula producing faster than you can eat, there are a couple of options: dehydrating or freezing. To dehydrate your arugula leaves, place on a dehydrator rack at 110º F for 6-24 hours. When the leaves are crunchy (you can break them in half), remove from the dehydrator and place in a tightly sealed pouch or Mason jar with an oxygen absorber. Dehydrated arugula can be used in soups and ground into a powder to add to pestos, soups, or even on meats for additional nutrients.
You can also freeze your crop in an air-tight bag or container and use in smoothies or defrost and use in recipes that may call for herbs.
Let us know if you have any questions in the comments below and happy growing!
If you have a specific question that you would like to ask, feel free to add in the comments below and we will be sure to answer them in the next Facebook Live Wednesday Walk Through Event mark your calendar for Wednesday, June 24 at 7 am Eastern (Atlanta, GA).
New to growing your own food in a Tower Garden? First off, kudos on your decision to take control of your own health and it all starts at the foundational level of the food we put into our body. It actually can go even deeper than that… it all starts with the parent plant that made the seed that we collect and then grow and then harvest to put into our body. But I digress…
When considering what to put into your Tower Garden, there are certain vegetables and herbs that grow well together. I have grouped these plants based on shared PPM (parts per million) values. You will need a PPM meter to measure what your water’s PPM is with the nutrient solution added.
When determining our list below, we look for areas where PPM levels share common ground (see blue vertical bars to highlight overlapping plant PPMs)… Note: this PPM reference chart is available in full for all our Tower Garden and hydroponic clients, but here’s a little snippet:
Note that some plants can tolerate higher levels of nutrients than mentioned here as these are ideal ranges for growth. You’ll know when a plant is getting too high a level when the edges of the leaves get a brown tint (called tip burn). Otherwise, know that these plant groupings are going to grow together fairly well at certain PPMs and that you can push some of the plants that are below the PPM level to the next level up in some cases…
based on the PPM of 775 and a pH of around 6.0, you could grow these plants together using the Tower Tonic Minerals Formula Parts A&B: Arugula, Artichoke, Basil, Calendula (petals of flower are edible), Cilantro/Coriander, Dandelion (leaves edible & root used in tea), Fennel, Lavender, Lemon Balm, Menarda (Bee Balm), Mustard Greens, Nasturtiums (leaves & flower are edible + plant deters some insects), Oregano, Pansies (flower petals are edible), Parsley, Rosemary, Sage, Thyme, Violas(petals of flower are edible), Watercress.
based on the PPM of 1000 and a pH of around 6.0, you could grow these plants together using the Tower Tonic Minerals Formula Parts A&B Artichoke, Basil, Chives, Fennel, Kale, Leek, Lemon Balm, Menarda (Bee Balm), Mustard Greens, Oregano, Parsley, Peas, Rosemary, Sage, Thyme, Watercress
(Lettuce/Romaine may grow in this range as well, just watch for tip burn on the leaves — some varieties may tolerate the PPM level)
based on the PPM of 1265 and a pH of 6.0, you could grow these plants together using the Tower Tonic Minerals Formula Parts A&B: Artichoke, Beetroot, Bok Choy, Broad Bean (Fava Bean), Carnation (2′ tall, but petals of flower are edible), Cauliflower, Celery, Chives, Cucumber, Kale, Leek, Marjoram, Menarda (Bee Balm), Mustard Greens, Parsley, Peas, Purslane, Pumpkin, Spinach, Summer Squash, Strawberries and Swiss Chard, Turnip Greens, Water Cress, Watermelon, Zucchini
based on the PPM of 1490 and a pH of around 6.5, you could grow these plants together using the Tower Tonic Minerals Formula Parts A&B: Beans, Beetroot, Bok Choy, Broad Bean (Fava Bean), Celery, Eggplant, Endive/Chicory, Chives, Cucumber, Kale, Melon, Mint, Okra, Hot Peppers or Sweet Bell Peppers (Note: Planting both near each other may result in cross-pollination if outdoors and open-pollinated by bees and your sweet peppers can get a bit of heat in the flavor department. If growing indoors and hand pollinating blooms, you should be fine.), Purslane, Pumpkin, Spinach, Summer Squash, Strawberries, Swiss Chard, Tomatillo, Tomato, Turnip Greens, Watermelon, Zucchini
Remember to put larger plants like kale and those that vine like peas, cucumber, and nasturtiums towards the bottom and you’ll need a support next to the Tower Garden where the vines can continue to grow out and fruit. Taller plants go towards the top (like Celery and Rainbow Swiss Chard).
based on the PPM of 1990 and a pH of around 6.5, you could grow these plants together using the Tower Tonic Minerals Formula Parts A&B: Beans, Beetroot, Broccoli, Brussels Sprouts, Cabbage, Dill, Hot Peppers, Sweet Bell Peppers, Tomatillo, TomatoKeep in mind that your squashes, watermelons, tomatillos, and tomatoes are going to be heavy “feeders” meaning they will drink up water and nutrients during the hotter summer days.
Okay, so now you have an idea of what plants have similar growing PPM characteristics. Select one PPM group based on vegetables and herbs you like to use every day!
Keep in mind that for most of us, lettuce has to travel quite a ways if you’re purchasing it from a big box store especially. 70%+ of all romaine is grown in Salinas, California. That means that romaine has to travel roughly 3,000 miles to get to my plate here in Atlanta, Georgia. They say on average it takes 10 days for a harvested romaine to get from the farm to our dinner plate! This is unacceptable! Especially since we know from industry studies that due to respiration rates of plants, nutrient availability decreases within the first 24-48 hours! That translates into you losing out nutritionally on the very purpose of eating that salad! So, with that in mind, simply starting by growing greens is a great place to start. I also like greens because of they mature in 4-6 weeks meaning you get to see your success (and enjoy the fruit of your efforts) earlier rather than later.
The other thing to consider regarding a salad is the number of varieties you have probably never tried because the grocery store only carries 3-4 options. I have found that some of my best salads incorporate a variety of greens and textures. Have fun exploring greens you’ve never tried before — you might find you really like them fresh off of your Tower Garden. I had always shy’d away from Bok Choy in the grocery store because it looked limp and lifeless, but when I grew it in the Tower Garden it was super tasty and I learned that I could keep harvesting for 2 months until the plant flowered. Now it’s something I always plan on growing because it can be added to soups, quinoa, and salads.
If doing a greens selection to grow on your Tower Garden, I like to recommend my clients include a nasturtium on the lower part of their Tower Garden because a) you can eat both the leaves and the flower, b) most people have never tasted a nasturtium because they are not found readily in the grocery store and most often found on the fine diner’s plate, c) they are so pretty to look at on your tower and d) they are companion plants meaning they are good to grow next to other plants to help deter certain pests… When planted alongside cucumbers. eggplant, tomatoes, or squash plants, nasturtiums may repel cucumber beetles, whiteflies, aphids and squash bugs. There are other edible flowers in this range that would be fun to explore if you’re willing to be adventurous.
If you decide to do a vining crop with a higher PPM, keep in mind space (tip: put a trellis next to where the plant’s port is and it can grow off to the side. These vining plants are often water hogs and love the sun, so plan accordingly for anything planted above them — those plants will also need to be heat tolerant. I always recommend including a flowering plant as it will attract pollinators and pollinators (aka: bees) will plump up your fruit and leave your flowering plants in a better state than how they found it.
Tomatoes are the most popular thing to grow. Ideally, you’ll want to look for varieties that have compact traits, but if you do have room next to your outdoor Tower Garden, make sure you can handle the growth habit on a trellis. My favorite tomato is an heirloom variety, Cherokee Purple, and it’s vining can reach up to 10′ or more if it’s given the nutrients it loves. (And BOY do they taste AMAZING!!!!) Cherry Tomato varieties are going to be prolific, so plan a space to support their growing needs to you have airflow and are able to easily keep pests from moving in on your crop.
Tip: If you are putting large vining plants in the lower ports of your Tower Garden. Plant to the left, right and on the back side leaving the front port open. (You may want to cover that port with a rubber disc like this.) The reason for leaving the front port unplanted is you need access to your water reservoir opening and some vines take over and make it difficult to reach it.
And my last thing to highlight is the pepper — remember that if you are growing outdoors and have hot peppers and sweet peppers both growing in your Tower Garden, you may get some cross-pollination through open-pollination and your sweet peppers might be hotter than their parent plants. It’s a good idea to just pick either hot peppers or sweet peppers if growing outdoors. Now if you’re growing indoors under lights, you can plant both hot and sweet in the same system in ports on opposite side of the Tower Garden because you will have to self-pollinate your flower buds anyway (turn a fan on to give your tower a light breeze or hand-pollinate with a toothbrush or paintbrush).
This should get your started. If you’re looking for Seed Providers, you can check out our article here.
PS: If you want a printable version of the information above to print off and to use as a reference in your garden journal, simply click here: Growing by Common PPMs.
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This Black Seeded Simpson seed was packaged in 2014 and we just did a germination test. We placed on a wet paper towel under bright light (lettuce needs light to germinate) at 70°F for 24 hours, covered in darkness overnight and found germination! Six-year-old lettuce seed properly stored germinated! It amazes me the life that is contained in one little seed.
Doing a quick germination test like this prior to ordering seed can save you the hassle and money of purchasing new seed. To calculate your germination rate, take the number of seeds that germinated (evident by the radical root emerging from the seed casing) and divide by the total number of seeds you put in your tray — that will give you the germination rate of your seed.
Because I use rockwool for hydroponics, we can use seeds from this germination test and transfer them into wetted rockwool and continue to grow them in ideal seed started conditions (warming mat to 70°F and bright lights). No seed is wasted! This also helps me conserve my rockwool.
To transfer germinated seeds, I take a tweezer with (the kind with a flat edge) and clean them with rubbing alcohol and finish off with a quick rinse of water. I gently pick up each germinate seed with the tweezer and drop it into the hole of my rockwool making sure to not plant the seed too deep. General rule of thumb whether sowing soil or into another planting medium like rock wool is to plant seed as deep as it is wide. I sometimes use the plastic tip of my nearby plant marker to slide it off of the tweezer tip as we don’t want to crush the seed embryo (still inside seed casing). I also plant two seeds per rockwool cube (in case one doesn’t make it for some reason.) I can always thin out to one plant as the seed grows into a seedling.
If you want tips on how long seeds can last when properly stored, check out our handy guide here.
PS: Food for thought… Jesus said you need only to have faith in Him — even if it’s as small as a mustard seed… Think of how much life is just within a little tiny seed. The giant redwood tree, for example, comes from something that is so tiny… if God can create a magnificent and awe-inspiring tree, how much MORE amazing and beautiful are you who is made in His own image.
“He told them another parable: “The kingdom of heaven is like a mustard seed, which a man took and planted in his field. Though it is the smallest of all seeds, yet when it grows, it is the largest of garden plants and becomes a tree, so that the birds come and perch in its branches.””
Matthew 13:31-32 NIV https://www.bible.com/111/mat.13.31-32.niv
Tips for Hydroponic, Aeroponic, Aquaponic, and Soil-based Gardening Methods