Organic Gardening


Here's a concept that may be new to some.  It is to me. 

Info from

Keyhole Gardens: A Drought Tolerant Composting Garden

By Bev Walker (Sundownr)

May 3, 2012

A Keyhole Garden is a raised bed, lasagna garden, composting, and recycling system all rolled into one.

The design creates a garden that uses recycled materials, less water and maintenance, and can be made handicap-accessible.

Gardening picture
Whose Crazy Idea Was This?

The keyhole gardens are the brainchild of humanitarian charities and missionaries for use in impoverished countries with poor soil, bad weather, and starving people. At least one organization teaches the schoolchildren how to construct the gardens from available recycled materials and to care for the vegetables. The schools then have nutritious vegetables for lunches. The children are encouraged to build a keyhole garden at home to educate their parents, thus enabling families to feed themselves. Advisers visit with the families to trouble-shoot garden problems.

Keyhole Garden Concept

Keyhole Garden plan viewThe Keyhole Garden concept is brilliantly simple. A circular raised bed has a center compost basket that distributes nutrients to the surrounding lasagna-style garden bed. A small pie-slice section of the bed is used for easy access to the center compost basket forming the keyhole design (click the sketch on the left for larger image).

Kitchen and garden waste, along with household gray water, are added to the center basket. The soil bed layers are slightly sloped away from the center to aid water and "compost tea" distribution. As the materials decompose, soil, composting materials, and amendments are added to the bed in later growing seasons.

Keyhole Garden Benefits

  • Center compost basket provides a steady supply of plant nutrients and amendments
  • Uses less water with mulching and moisture from center basket; drought-tolerance
  • Depending on outer wall materials, soil can be warmer than traditional raised beds
  • Garden can be modified per owner's needs, like child or handicap accessibility
  • The short bed distance (from outer wall to center basket) is easy to tend
  • Gardens require a small area, a maximum of 6-1/2' (2 meters) diameter
  • Recycled material use makes the gardens inexpensive, or free, to build
  • The raised design removes threat of trampling by pets and humans
  • Saves steps by adding garden waste to the handy center compost basket
  • Keyhole Gardens can be made temporary or permanent
  • Keyhole Gardens can be an attractive feature with a good aesthetic design plan

Keyhole Garden Construction

Keyhole Garden Cross-section A-AThis is not a comprehensive how-to. If you would like detailed information to construct a Keyhole Garden, please follow the links provided at the end of this article, otherwise, refer to the Cross-section View A-A at left (click for a larger image).

The following is a list of recurring points made for the garden design to work efficiently. Use whatever materials you may have at your disposal that will allow the best result to be achieved.

    • Drainage: Rocks, broken tiles or pots, rusty cans, twigs, small branches, or old critter bones can be used for the bottom drainage layer.

    • Compost Basket: A tube, 1' to 1-1/2' (.5 meters) in diameter and tall enough to extend well above the center of the bed, can be fashioned from anything that will allow water to pass through into the surrounding bed like chicken wire, fencing, or sticks (think in terms of a woven basket). Supports to hold the basket in place, such as strong branches, boards, or rebar, and wire or strong twine to hold everything together, also, will be needed.

    • Outer Border Walls: Anything that will contain the soil could be used: stones, bricks, or blocks can be stacked into place; boards or branches could be driven into the ground; sand bags or old tires could work as well.

  • Planting Bed Fill: Use the same materials as for a lasagna garden, or compost pile, such as cardboard, paper, manure, leaves, straw, hay, old potting mix, or wood ashes, then finish the surface for planting with top soil.
    • A cleared level area no larger than 6-1/2' (2 meters) in diameter is the maximum size for a Keyhole Garden. A larger diameter bed may suffer from a lack of water near the outer wall of the bed (from the compost basket), and plants close to the center may be difficult to reach.

    • The cutout area of the keyhole should be wide enough to allow easy access to the compost basket when adding materials, removing compost, or making basket repairs if needed. Positioning the cutout on the North side of the circular garden would use the dark space of the bed that would not receive full sun, thus leaving all the sunny sides for planting.

    • All the layers added to the bed should slope downward to the outer border wall. The slope helps direct moisture from the compost basket out into the bed.

  • The outer border wall can be as high as needed for the comfort of the gardener and the amount of sourced materials. The top surface of soil should stay below the outer walls to contain rainwater and prevent the soil from running off.
Other Considerations:
    • A roof can be made to deflect excessive rain from the compost basket or to conserve compost moisture during drought.

  • Trellises could be installed to support cloches for weather protection.

Seed Starting

It’s time to start planning for our annual GDOGC plant sale. This is our main fundraiser and allows us to hold such nice events as the fall field trip and the garden tour, and to donate money every year to worthwhile garden-related ventures. How can you help? Start seeds of plants to grow at the sale. The sale will be April 12th, so it is time to get cracking! Here’s a how-to link for starting your own seeds: Sources for interesting seeds range from Burpee to Baker Creek to Seeds of Change. The key is to provide enough light so your seedlings don’t get leggy before you can put them outside in the sunshine. Grow lights are inexpensive and easy to rig up-mine are in my garage on a very simple pulley so I can raise and lower the lights as needed. Another easy thing I have found is to use a circulating fan set on low to circulate the air. This prevents damping off. A warming mat is a great investment as well-the seeds sprout much more quickly and it allows me to start my seeds in the unheated garage rather than the house, where my cats would have a field day. I have had the same mat from Gardener’s Supply Company for TWENTY years. It’s not pretty, but it works just fine. I use the mat to sprout a few flats of seeds, then rotate new flats onto the mat to sprout them. Eventually they are all uncovered and hardened off to the outdoors. I find my biggest challenge here in Texas is protecting them from the very fickle weather-one bad storm can wipe them all out. Finally, capillary matting also helps a great deal because it keeps the soil perfectly moist as long as you just keep even a little water in the reservoir. See,default,sc.html for more information. I also clean and reuse the capillary matting and it works for multiple years as well. At the sale we find vegetable transplants and herbs sell very well, in addition to annuals and perennials. Once we get a little closer to spring, consider dividing and transplanting plants and bulbs, and dig up any little “babies” that pop in your garden. I find there are always a few new Turk’s Cap, Rudbeckia, and other perennials to share from my garden. Please help us have the most successful sale ever!

Happy potting,

Allison Liddell




Taken from Organic Gardening online  :

It's an esoteric debate that sometimes erupts among organic gardeners: Are praying mantises good bugs or bad bugs? The question is irrelevant, even inane, says Dan Digman, an entomologist at Ohio State University. Mantises (also known as mantids) are predators—pure and simple. If hordes of Mexican bean beetles are defoliating your wax beans, you can bet that nearby mantises will be munching beetles. But if a tasty lacewing or honeybee flies within snagging distance, don't expect a mantis to pass up such an easy meal. To a mantis, all bugs are good bugs—good to eat, that is.

"Generally, mantises are good for the garden. They're part of a solution to a pest problem," says Digman. "But they eat beneficials, too. And if nothing else is available, they'll eat each other."

Warm-Weather Beasts Mantids are warm-region insects. Although 1,800 species exist worldwide, only 11 are found in North America. The Carolina mantis (Stagmomantis carolina), which is widespread through the South, and the obscure ground mantid (Litaneutria obscura), common in the Great Plains and arid West, are American natives. But the Chinese mantis (Tenodera aridifolia sinensis) and the common European mantis (Mantis religiosa) were both introduced to the Northeast for insect control. All are known by the common name praying mantis.