Worms in Aquaponics?

Last week I was cleaning out one of the beds that uses a continuous flow technique.  The plants had become so overgrown that it was time to do some serious pruning.  Because I was removing so much of the top of the plants I thought it would be a good idea to prune the roots as well.  These Everglades tomato plants are so hardy and they really respond to this pruning technique.

The grow media in this particular bed was a base of pea sized gravel with about 2 inches of expanded clay (Hydroton) on the top.

When the bed was first set up, I put some earthworms in there just to see how they did.  The answer to that question is..... they did wonderful thank you very much!  The earthworms help break down solids from the fish tank and help keep your grow beds clean.  They also assist with "mineralization" which is a fancy term that means they convert their food to available nutrients for the plant roots.  If you read much about serious aquaponics then you will run across the use of worms, but not earthworms.

My earthworms didn't know that they were not the preferred worm for aquaponics.  Each time I dug up some roots to prune I came up with enormous earthworms!  Now I know many aquaponic enthusiasts are crazy for red wigglers for their worms, but I am liking earthworms.  The first and foremost reason is because earthworms are cheap.  They are already growing in our compost beds.  We don't have hardly any red wigglers in our compost.  Maybe they aren't indigenous to South Florida.  I don't know, I just know that if you want red wigglers you have to buy them.

Because our compost pile is fed with bunny manure, I purge the worms before putting them in the bed.  I don't want to introduce any e.coli from our furred friends into the aquaponic gardens. 

Purging the worms is easy, just put them in a small amount of moistened corn meal for a few hours and they will have the equivalent of terrible diarrhea and vomiting. It is gross when you look in and see all that black gunk in the cornmeal, but the worm is clean inside and out.

I just give them a quick rinse in some water from one of the fish tanks and then into the bed they go and boy do they grow!

I put just a few earthworms in there when I set up the bed with the tomatoes at the end of last summer and now it is full of earthworms.  I have been routinely adding worms to each new bed that we set up, but I haven't done much in the way of digging around to see how they were doing.  Out of sight out of mind is the way they have been operating.

So I say if you don't have some worms in your grow beds, get some.  You may not have to go any further than your compost pile.

So do you use worms in your aquaponics beds?

Super Greens are Super Food

Super greens and power greens.  They are all the rage with foodies and nutritionists alike right now.  Everyone is crazy for kale.  I like kale as much as the next person (I even have loads of it started right now) and I have high hopes that kale can be my next chard.

By "next chard" I mean a plant that sprouts easily, thrives in the aquaponic environment, and produces an abundance of edibles.  Since the fall, we have been enjoying an abundance of chards.  We have the traditional Fordhook chard as well as the Bright Lights colored Swiss chard.  As usual, the seed from Southern Exposure had a germination rate of almost 100%.

I admit to sprouting the chard seeds in soil and a wicking bed I rigged up, but once they hit the auqaponic systems they took off.

Chard in NFT Tubes on A-Frame

Bright Lights Chard in DWC raft

Chard in expanded clay media bed, flood and drain

While they seem to have done best in the NFT tubes, they performed well using all techniques.

I have been harvesting with a "cut and come again" strategy.  This means I don't harvest the entire plant at once.  I harvest the lower leaves and the plant continues to grow from the top.  This explains the odd growth pattern you may see in the pictures. The stem may start growing a little crazy, but the plant continues to produce new leaves and that means more for us to eat.

It means so much to eat that I have been stretching my culinary capabilities to find new uses for chard.  Chard pizza anyone?  It was actually quite tasty.  I wilted the red chard before baking it on the pizza.  Chard frittata?  It made a yummy brunch.  Of course sauted chard, boiled chard, chard wilted with bacon, chard and cornbread. Chard has made its way into just about everything but the Cheerios.  But if they keep going this strong, the Cheerios might be next.

Seriously, if you are going to the trouble to grow your own food, why not make it something that will pack a nutritional punch.  Chard has at least 13 flavonoids. One of the primary flavonoids found in chard is syringic acid. Syringic acid has recently received special attention due to its blood sugar regulating properties. It has been shown to inhibit activity of an enzyme called alpha-glucosidase. When this enzyme gets inhibited, fewer carbohydrates are broken down into simple sugars and blood sugar stays steadier.  This is important to anyone that is concerned about diabetes, weight control, or eating low on the glycemic index.

Chard also is rich in betalains, just like its cousin the beet.  This phytonutrient has antiinflamatory, antioxident and detoxification properties.  Chard as a beauty product?  Sure, if we are what we eat, why not eat something rich in vitamins A and K so that healthy skin starts from the inside. Chard packs a punch of vitamin C as well.  If you are fearful of the oxalic acid found in chard, be aware that it is concentrated in the stems.  So, all you have to do is add the stems first (so they will cook longer than the leaves) as heat destroys the oxalic acid or if you are eating the chard raw, just discard the stems. 

Got any good chard recipes?  What is the super survivor in your garden right now?

A Tale of Two Eggplants

I love nightshades.  They are one of the most diverse families of plants and contain some of my most favorite things to eat.  The Solanaceaes include tomatoes, peppers, eggplants and potatoes.  It also includes petunias and tobacco..  You can keep the potatoes, petunias and  tobacco.  I don't smoke, I don't like to eat potatoes ( I prefer rice) and petunias stink. But tomatoes, peppers and eggplants....Oh My!  And cooking all three together?  Even more Oh My!

I am currently growing several types of tomatoes, peppers, and one type of eggplant.  I have had poor luck with germinating pepper and eggplant seeds this season for some reason.  I put my eggplants in two different test systems this time to see if there was a difference in plant growth or production.  Early results say that my eggplants are preferring a flood and drain environment to a deep water culture (DWC) system.

Here is the picture of the eggplant in my flood and drain test bed. 

The largest leaf on this plant measures 9" wide and is 11" long. As a matter of fact I had to tie it up today as the leaves are so heavy the plant had flopped over and was shading the rosemary.

Here is a picture from the deep water culture test bed.

The largest leaf on this plant measures 4" wide and 4" long. It has just flowered.  Same type of plant, planted at the same time.  By the way, look in the background of this picture and you can see how much my onions love DWC. If you don't have onions in your DWC get some now!

The flood and drain system is only slightly older than the DWC by about 2 weeks.  Both systems were cycled early last spring so they are approaching their first birthday.  Both have the same number of fish.

So far, it is looking like flood and drain is the way to go for growing eggplant.  Part of making sure your garden can survive is testing things out to see what works best.  Before growing anything on a larger scale, I run a test garden. I am also currently testing peppers in flood and drain versus nutrient film technique (NFT).
Stay tuned for those results.

How do you grow your eggplants?

Following the Laws of Nature

Some of the posts I have read on the aquaponics boards I follow have led me to believe that people think that aquaponics is some sort of plant growing magic.  That if you grow a plant with aquaponics you can somehow ignore all the parameters that nature has placed on a plant. 

It is not true.

If you want to survive, you have to know what will grow successfully when.  If you are in Montana and there is three feet of snow on the ground, you can't grow a tomato with aquaponics unless you control the environment.  The self sustaining nature of aquaponics will not allow that tomato to survive the cold unless you do something to control the temperature.  You need to know the agricultural zone in which you live.  To find your zone number, go to USDA Plant Hardiness Map and enter your ZIP code.  Memorize this number.  When you are researching plants and seeds, the provider will always tell you in what zones the plants will grow.  Staying within your zone will contribute to your success.  Staying within your season is also important. Just like the guys in Montana can't grow tomatoes in winter because of the cold, I can't grow cucurbits (like cucumbers, melons, squash) in summer because the air temperature is just too hot.

That means you need to learn about both growing the fish and growing the plants.  For example, we recently had heavy rains (quite normal for our south Florida summer) and as a result some of my plants (both soil and aquaponic) were infested with powdery mildew.  Just because the plants were in aquaponic systems did not make them immune from the mildew.  In this case, all I did was remove the infected parts (they did NOT go in the compost) and the plants recovered quickly because I acted quickly.  If necessary, I could have sprayed with a solution of baking soda and water (keeping an eye on the pH fo my water).  The point is no matter if the plant is in soil or not, you need to know how to take care of the plants, because if you have a garden you will have pests and diseases.  Your goal is to minimize these while maximizing yield.  That is where aquaponics comes into play. You are going for high yield because you are using your animal protein growing system to provide the food for the plants, thus providing constant nutrition to the plants. 

Another question I read was from someone who wanted to know why the seeds his neighbor have him weren't performing like the neighbor's plants.  Well, if your friends give you the seeds of their hybrid plants, you can't expect them to perform the same.  No matter if the plant is growing in aquaponics or soil, you can't save the seeds of hybrids and expect them to reproduce true.  Always use heirloom or non-hybrid seeds.  Learn to dry and save your own seeds. When someone offers you seed, ask them about their source.