Urban Farmer: Cloning * Rockwool * Alaska

This post may contain affiliate links. That means if you click and buy, I may receive a small commission. Please read my full disclosure policy for details.

Back to Back Issues Page
Urban Farmer: Cloning * Rockwool * Alaska
May 01, 2017

Volume 3, Episode 16

May, 2017

“Everything that slows us down and forces patience, everything that sets us back

into the slow circles of nature, is a help. Gardening is an instrument of


~ May Sarton





The Sip of Life? Well,

when you first take a cutting, a bubble of air can be drawn into the stem,

preventing solution from getting to the plant later. (Sorta like an “air

embolism”). The plant will die if this happens.

So how do you prevent air bubbles in the stem? Glad you asked:

You are going to make a second cut under water. Place the cut end of the stem in

a bowl of warm water, then take your clean

razor knife and cut the stem about an

inch up from the original cut, at a 45° angle (under water). 

Leave in the water until ready to plant. You want to end up with cuttings about

2-4” long, with only 2 sets of leaves (strip off the rest).

More about cloning here:



Arctic farmers defy icy conditions with hydroponics



landscape is virtually treeless around a coastal hub town above Alaska’s

Arctic Circle, where even summer temperatures are too cold for boreal

roots to take hold.

Amid these unforgiving conditions, a creative kind of farming is

sprouting up in the largely Inupiat

community of Kotzebue.

A subsidiary of a local Native corporation is using hydroponics

technology to grow produce inside an insulated, 40-foot

shipping container

equipped with glowing magenta LED lights. Arctic Greens is harvesting kale,

various lettuces, basil and other greens weekly from the soil-free system and

selling them at the supermarket in the community of nearly 3,300.

Read full article here:


Rockwool Grow Medium

Hydroponic gardening offers a way for growers to get creative.

With so many different types of grow mediums all with their own respective

advantages, there really is a grow medium for everyone. Coconut coir, perlite,

and clay pebbles are all soilless substrates commonly used by hydroponic

growers. Another medium that’s easily become one of the most popular is rockwool.

Rockwool as a grow medium is man-made mineral fibre. It’s created from rock


has been melted and spun until it’s become fibre much like fibreglass. These

fibres are then compacted and shaped into a slab or into smaller cubes. They

break apart easily and are often used right from the seedling stage. When

breaking apart rockwool slabs or cubes, be sure to wear face protection because

these are tiny fibres you’re handling and you do run the risk of ingesting the

dust. Rockwool is not a natural material and is therefore not biodegradable.

Benefits of Rockwool

Rockwool is a popular hydroponic substrate because it offers many important

benefits required to make soilless gardening more enjoyable. Rockwool is

extremely moisture retentive. It also provides great aeration allowing your

plants’ root systems to obtain proper levels of oxygen.

Rockwool is also a convenient choice for growers because it breaks apart so

easily you can adjust the sizes to meet your needs. Throughout the growing

cycle, you can rest assured that your rockwool substrate won’t degrade and

breakdown over time. It will strong and continue to retain water properly. This

is important to note because a concern is that disintegrating materials will

clog up your system’s components.

All of these benefits of are important to consider when choosing your grow

medium. Rockwool for its reliability and convenience makes it an excellent grow

medium to use consistently from propagation to harvest.

Learn more about the types of rockwool

products available online or at your local indoor gardening shop. o


Emily Rodgers ]



Don’t forget to order our new e-book:


  Simon’s Super


          On-The-Grid, Off-The-Grid




Survival Greenhouse

233 pages crammed full with tips, supply lists,

step-by-step directions, photos and diagrams and lots of bonuses along the way.

With this book, you can build your own insulated hoop greenhouse, any of 7

different hydroponic gardening systems, build a simple but prolific solar power

pack and even a 275 gallon aquaponic setup!

Read all about this new ebook here:

http://www.hydroponics-simplified.com/greenhouse-plan.html .


Thanks for subscribing and for reading our ezine.

Happy farming Ya’ll!




Back to Back Issues Page