Easy Hydroponic Planter: Grow Lettuce in Repurposed Coffee Container!

If you consider yourself more of a “foodie” and less of a “gardener” because you don’t like the idea of getting your nails dirty, read on!

You can grow lettuce, greens and herbs year-round in a hydroponic planter made from a repurposed coffee container.

 

Before you start questioning how difficult it must be to make a hydroponic planter, stop!

I want to share with you instructions for creating a specific low-tech hydroponic planter that uses no electrical pumps or air stones to circulate the water.

I’m referring to the Kratky Method of the “Non-Circulating Hydroponic System,” which is pure genius.

 

Developed by B.A. Kratky at the University of Hawaii, the simple hydroponic planter works on this premise:

(This explanation is from the “Three Non-Circulating Hydroponic Methods For Growing Lettuce” article on the University of Hawaii website.)

 

Red coffee container hydroponic planter for lettuce kratky method shirley bovshow foodie gardener blog

A non-circulating hydroponic concept for growing lettuce is described where electricity and pumps are not needed and the entire crop can be grown with only an initial application of water and nutrients.

At seeding or transplanting time, the growing containers are supported by the tank cover with their lower portion being immersed in nutrient solution.

This moistens the growing medium in the containers by capillary action, thus automatically watering and fertilizing the plants.

Plant growth causes the nutrient solution to lower and creates an expanding moist air space and an expanding root system.

The main function of the roots in the moist air space above the nutrient solution is aeration whereas the roots extending into the nutrient solution absorb water and nutrients.

 

 

WHAT IS HYDROPONICS?

  • Hydroponics is a system of growing plants in water without soil.
  • Plants receive their necessary nutrients through the hydroponic fertilizer that’s added to water.
  • The plant roots are stabilized in clay pellets or perlite, coconut coir, or rice hulls instead of soil.

 

 HOW DOES A COFFEE CONTAINER TURNED HYDROPONIC PLANTER WORK?

 

Take a look at my transparent demonstration model, but don’t use a clear container for your project.

It will allow light in and encourage algae to grow!

 

 clear container hydroponic lettuce kratky method shirley bovshow foodie gardener

 

The coffee container is filled with “nutrient water”  (water + liquid fertilizer) all the way up to the top.

 

One gallon of nutrient water per plant is an optimal ratio when growing lettuce, so use the right size container.

 

The water covers and soaks the bottom 1/4 inch of the net pot that’s filled with clay pellets that support the young lettuce plant.

Clear container hydroponic lettuce long roots foodie gardener

 

As the water recedes, the plant roots continue to grow down looking for water and picking it up, as needed.

 

The space between the water and the bottom of the net pot  is filled with humid air which provides oxygen to the roots.

 

When the water level drops to the bottom (after approximately 30 days), the lettuce plant is usually full grown.

 

You can grow another lettuce plant in this container!

 

Some people call the Kratky Method the “wet it and forget it” planting system.

 

LIGHT REQUIREMENTS FOR GROWING LETTUCE

 

Lettuce is a cool season plant, so it can grow outdoors in mild winter areas in an area that receives a full day of sun.

Indoors, place your container by a bright window or use a florescent bulb for 10 hours if you don’t have natural light available.

The Kratky method works well for growing lettuce, greens and herbs but is not as effective for fruiting edible plants.

 

Here is what you need to make your coffee container a hydroponic pot.

             

 MATERIALS TO MAKE A HYDROPONIC PLANTER

  • 33 oz or larger opaque coffee container.  Don’t use a clear container as the light encourages algae growth
  • Blade
  • Hydroponic “net pots” in 2-inch and 3-inch sizes.
  • Liquid plant food
  • Filtered water

INSTRUCTIONS

 

black plastic container cover with hole for net pot foodie gardener

 

1. Use a 2-inch or 3-inch net pot as a template for cutting a hole on top of the coffee container cover.

 

folgers coffee container top with hole for net pot hydroponic lettuce planter foodie gardener

 

2. Cut out hole and insert the net pot.

3. Fill the coffee container with 1 gallon of filtered water and add 2 teaspoons of hydroponic plant fertilizer, then stir.

4. Place the coffee container cover (with net pot in it) on the container and put a lettuce plant in it.

 

 

 

Which brings you to the question of how can you grow lettuce seedlings without soil?

 

 

 

MATERIALS TO GROW LETTUCE SEEDS

 

Materials plant hydroponic seed growing hydratone clay rock wool net pots

  • Rock wool cubes
  • Salad bar container with plastic cover or seedling grow tray
  • Clay pellets called “Hydrotone”
  • Wood toothpick
  • Seeds

 

INSTRUCTIONS FOR GROWING SEEDS WITH NO SOIL

 

Soak the rock wool cubes in water for 10 minutes to absorb water.

lettuce seeds on wood stick for planting foodie gardener

 

Use the end of a wet toothpick to pick up lettuce seeds and drop 2 per hole in rock wool.

 

plant lettuce seed in rock wool with wood stick foodie gardener

 

Cover small hole with piece of paper towel.

Place rock wool in seed tray or in salad bar tray and cover with plastic top to create humidity.

 

lettuce seedlings in rock wool foodie gardener

 

Set tray on top of a warm appliance (TV, microwave) or on a grow mat for 1- 12 days and check daily for growth and humidity.

 

small hydroponic lettuce seedling in net pot coffee container planter foodie gardener

 

Once the seedlings have a few leaves on them, you can put them in a small net pot, stabilize with clay pellets and put the pot in your special repurposed coffee container/hydroponic planter!

 

Set your hydroponic lettuce plant near your sunniest window and supplement with florescent lights for 10 hours per day if in a dark room.

WATCH THE VIDEO SEGMENT AS SEEN ON “HOME & FAMILY” SHOW!
Edible garden designer expert shirley bovshow hydroponic lettuce kratky method repurposed coffee container non circulating hydropnics foodie gardener blog
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About the author  ⁄ Shirley Bovshow

I'm known as "EdenMaker," as well as a "Foodie Gardener" on the web, but you can call me "Shirley" anytime! When I'm not eating or growing my own food, I'm busy designing gardens and producing garden TV shows! When it's time to cook, I ask my family, "What country do you want to visit tonight?" Thank God for WeightWatchers, most of my fruits and veggies are "0-Points." Some of you know what I'm talking about!

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