Will an unheated greenhouse protect from frost?

Using an Unheated Greenhouse in Winter During the day, a typical greenhouse will trap heat from the sun, which allows the plants inside to stay warm at night. However, when winter nights get really cold, frost damage in the greenhouse can occur without added protection.

gardeningknowhow.com - Using An Unheated Greenhouse - Gardening Know How

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In an unheated greenhouse, growing anything during the cold months of winter may seem impossible. Alas, it is not! Knowing how to use an unheated greenhouse and what plants are best suited are the keys to success. Read on to learn more.

Using an Unheated Greenhouse in Winter

An unheated greenhouse in winter will not only allow you to grow hardy veggies, but you can start tender annuals, propagate perennials, and overwinter cold sensitive plants. Of course, it helps to know how to use an unheated greenhouse (or “cold house,” as it may be called) effectively and what plants will be most suited to this cooler environment. During the day, a typical greenhouse will trap heat from the sun, which allows the plants inside to stay warm at night. However, when winter nights get really cold, frost damage in the greenhouse can occur without added protection. What types of protection are available in lieu of greenhouse heaters? This can be as simple as the addition of one or two layers of horticultural fleece over your plants (remember to remove coverings during the day so they do not overheat) and placing some bubble wrap around your pots to help insulate plant roots and prevent clay pots from cracking. Horticultural bubble wrap also can be used to layer the inside of your greenhouse. The much-needed sunlight will still come through, but the extra layer of protection will keep your plants safe at night. Chances are good your unheated greenhouse is a simple cold frame or hoop type of structure. This structure is very simple to use in the winter and fairly low cost. It should be situated so it is getting the most natural sunlight possible, out of the way of winds, and as close to a water source as possible. Keep an eye on the thermometer, especially when heading toward spring. In many regions, temperatures can be in the 30s (-1 to 4 C.) one day and in the 60s (16 to 21 C.) the next (in a buttoned-up greenhouse it can be much higher). Plants don’t often recover from sudden overheating, so be sure to open the greenhouse if temperatures threaten to soar.

What to Grow in Unheated Greenhouses

When you have a temperature-controlled greenhouse, the sky is the limit as to what can be grown through the winter months. However, if your greenhouse is a simple affair, lacking any heat, don’t despair. Using an unheated greenhouse can still provide you with plenty of options. An unheated greenhouse can be used to grow greens during winter, start warm season annuals, propagate landscape perennials, and shelter frost-tender plants through the winter chill. Besides greens like spinach and lettuce, you can grow cold tolerant veggies such as cabbage and broccoli in your unheated greenhouse. Celery, peas, and the ever-popular Brussels sprouts are also excellent cool-weather veggie choices for unheated greenhouse growing. Other winter greenhouse plants that thrive during winter months are root vegetables. Winter temperatures actually stimulate sugar production in some root veggies, so you end up with the sweetest carrots, beets, and turnips imaginable. Don’t stop there with your winter greenhouse gardening though. Perennial herbs are another option – oregano, fennel, chives, and parsley (biennial) do well. Cool-hardy flowers, like calendula, chrysanthemum, and pansy, not only thrive in a cold house but will bloom through the winter. Many annuals and perennials that may not be hardy in your climate outdoors will actually flourish in the greenhouse, even those that are seeded in fall will grow and produce a bounty of blooms in late winter to early spring.

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What materials do you need to make a greenhouse?

Lumber, PVC pipes, aluminum and galvanized steel are often used to make greenhouse frames. Wooden greenhouses are beautiful, but high humidity and dampness can cause rotting. Use a moisture and rot-resistant timber such as cedar and a ground contact-rated wood for the foundation.

homedepot.com - How to Build a Greenhouse - The Home Depot

A greenhouse provides a place for your plants to grow in a controlled environment, right in your own backyard. Use this guide to learn how to build a DIY greenhouse from the ground up or from a greenhouse kit. Before you start, check your zoning laws and regulations and ask local officials if you need a building permit. Be safe and have a friend help you assemble your greenhouse. Many steps will require assistance lifting and holding parts steady. If you have big greenhouse plans, but don't have the ability to lay a foundation, a portable greenhouse can offer the same benefits to your garden plants. Being able to move the greenhouse around can also help with shifting crops as the seasons change. Use the greenhouse to extend the growth of summer vegetables and flowers at the end of a season. If the plants don't show signs of pests or diseases, add them to the compost pile when they're finished. This guide is an overview of the building process, and steps 1 and 2 apply whether you’re using a greenhouse kit or building a DIY greenhouse. To build a DIY greenhouse, see steps 3 through 10. Use this PDF for instructions on how build the greenhouse seen in the video. For an overview of building a greenhouse from a kit, see step 11 and follow the manufacturer's instructions for your particular model. If you need advice on how to build a greenhouse, talk to a building materials associate at The Home Depot.

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