Cold Frames and Cloches

Cold frames are simple devices that are versatile and can help you year round. I know that we usually think about these things in terms of getting our seedlings started in the spring, but they also help promote growth in the summer, extend the season into the fall, and can allow us to harvest vegetables even in the winter.

A key element to my frugal living is being able to harvest long after the summer season is over. Build a device like a cold frame, and you'll be able to do much the same.

I know it seems unlikely, but a cloche (pronounced clo-shh), a row cover and a cold frame can be a year round helper to protect against frost, hail, storms, critters, bitter cold and high winds. It's relatively easy to create your own, and simple cloches cost almost nothing to construct.

Let's look at the principles and advantages of these devices so we'll understand how best to use them.

Physical Protection

Whether you have tender young plants, healthy growing plants, or a crop that's getting ready to harvest, they could all use a little protection from the elements. A simple cloche or coldframe can help you in this regard.

Here in Wyoming, we have high winds that will bend plants over and dry them out. We also have more occurrences of hail each year than anywhere else in the United States. Providing plants with physical protection is a must if we're going to keep them healthy and producing food for us.

When I lived in Michigan, we would have rain that lasted for days on end, sometimes a good hard rain. This type of precipitation can knock plants to the ground and wash soil away from surface roots. Protection in the form of a coldframe would be helpful.

Only the smallest and most persistent of critters will get into your cold frames and cloches to nibble away on your plants. I have trouble with mice, but a tightly closed cloche helps keep them out. The coldframe structure foils rabbits and birds as well.

Here's how to make a cloche for next to nothing in cost.

Moisture Retention

In climates where warmth and wind help dry out the soil, cloches and cold frames can help retain moisture.

This is especially important when first planting seeds. There is little danger of overheating the soil and killing young plants by trapping in heat from the sun, so sealing things up with a coldframe or cloche helps warm the soil and keep moisture right where it's needed to sprout the seeds.

When warmer weather comes, you'll want to make certain the cover is vented to keep plants from wilting under the higher temperatures that can be generated in these miniature greenhouses.

Miniature Greenhouse

The overall advantage of a cloche or coldframe is that you're creating a type of greenhouse for your plants or seedlings. It's essentially a miniature greenhouse that is manually operated. That means it offers the same type of protection, moisture retention and multiplication of the sun's efforts as would occur in a larger greenhouse.

Keep in mind that cloches and similar devices will heat up and cool down very quickly, within less than a minute, so regulation of the inside temperature will be tricky. And, it most likely will be a manual activity.

Here's an example of a seedling greenhouse that is really a poor man's cloche. Nevertheless, it works well to achieve the objective of extending the season.

Having these miniature greenhouses will allow you to grow earlier than normal, later than normal, and with cold hardy vegetables, you'll be able to harvest in the winter as well.

Here's how to how to make a coldframe from wood with a hinged lid.

As shown in this link, I suggest you make your own cloche out of whatever you think might work.

A Clear Thermal Blanket

Cloches and cold frames offer a type of clear thermal blanket for a small grouping of plants or a single plant. They help trap in the warmth of the sun and that heats up the soil and air inside.

The blanket effect isn't quite what one might expect from a blanket because we're only talking about a single layer of plastic, so it's insulating effects are from trapping "dead" air inside. Air that isn't moving can't transfer heat as well, so that's how heat is retained.

To boost the thermal blanket effect after the sun goes down, cover your cloches or coldframes with old sleeping blankets, sheets, towels or other material that offers some type of insulating qualities. It will slow the release of warmth as well as the intrusion of colder air.

Cold Frames and Cloches - their drawbacks

It's only fair to list the potential drawbacks of coldframes and cloches as there are some to keep in mind. Here they are with brief explanations:

• Limited growing space - usually cold frames and cloches are small and limit the number and size of plants you can grow.

• difficult to regulate internal temperature - with fast heat up from the sun, and quick cool down from opening the enclosure, cold frames and cloches aren't going to maintain a constant temperature unless you have constant weather conditions, and you carefully adjust openings in the enclosure to bleed off excess heat.

• risk of plant wilt - if you seal up your plants to endure a chilly overcast day, and then the sun comes out, you'll have "cooked" plants within an hour or so unless you recognize the sun breaking through and take action to make adjustments to vent excess heat.

• a little inconvenient - even with the limited structure of a cloche, it still is a bit inconvenient to work on your garden.

Here's an approach to building a cold frame that's manually regulated but relatively easy to adjust. This should be a good way to keep from cooking your plants while giving them good protection from the elements.

Great Little Garden Helpers

So, if you're inclined to get a head start, extend the season, or garden "out of season," cloches and cold frames are probably just what you'll want to employ. They are quick and easy to make, and allow you to get a head start on the season.

Best of all, they don't have to be expensive, so your frugal living vegetable gardening interests will be fully supported by these little enclosures. Whether you use wood, PVC, wood and steel, or just make a plastic tepee over your plants, you'll enjoy the advantages that cold frames and cloches afford you.

Done with Cold Frames and Cloches, take me Home