Updated at: 23-04-2022 - By: Sienna Lewis

In Wisconsin, setting up a tiny greenhouse is as simple as it is in other states. Located in the middle of the United States, Wisconsin has coasts on the Superior and Michigan lakes, two of the country’s largest. In addition, the state’s numerous farms and woodlands make it a popular destination for gardeners.

Wisconsin’s largest city and home to Milwaukee Public Museum and the Harley-Davidson Museum, Milwaukee is known as the place to see the most beautiful motorcycles. There are a number of local brewpubs that offer brewery tours, and many of these groups are situated in the city.

What is a greenhouse?

In a greenhouse, plants are kept from the cold and other environmental hazards by using clear walls (such as pests).

A Beginner's Guide to Using a Hobby Greenhouse ~ Homestead and Chill

You can supplement your greenhouse’s heating system, or you can rely on the sun to do the job. Tropical plants can be grown in temperate climates thanks to climate battery greenhouses (like those described in “The Forest Garden Greenhouse”), which store heat underground.

Keep in mind that DIY choices are many, but many of them will not hold up to long-term use or they may not have all of the necessary components (like good ventilation).

What To Do In Wisconsin: The State For Gardeners

In Wisconsin, growing in a greenhouse is a wonderful and enjoyable experience. Asparagus, garlic, leeks, mushrooms, beets, blackberries, broccoli, cauliflower, beans, bitter melon, apples, and carrots are just a few of the many herbs, fruits, and vegetables that thrive in the state.

Wisconsin is a terrific place for gardeners and greenhouse managers to call home. If you’re in Wisconsin, you should check out the Cave of the Mounds, Interstate State Park, the Wisconsin State Capitol, and the Olbrich Botanical Gardens, just to name a few of the many things to do.

The state is blessed with a wide variety of attractions. Art and culture, entertainment and cultural shows, local gastronomy, and the great outdoors are all things you can do here. It’s fun to build the greenhouse with your family and friends here in the state.

Setting Up Your Mini Greenhouse In Wisconsin

Considering the location’s ability to accommodate the construction as well as its climate are both important factors to consider while constructing your small greenhouse in Wisconsin. In most cases, setting up a greenhouse in one state will be similar to setting it up in another.

Lighting Up The Area And Arranging The Position Of The Plants

If you want to produce your own lights, you’ll need a garden center or home improvement store to supply you with the necessary tools. Fluorescent elongated tubes and flood bulbs can both provide light that resembles that of the sun.

As a second consideration, you should be able to set up or position the plants in an area where you have access to an electrical outlet. Just a few inches above the plants, these lights can be hung.

The Use Of The Heating Mats

The usage of various heating mats may also be necessary while figuring out how to set up a tiny greenhouse in Wisconsin. The seedling trays must be placed on top of the heating maps in order to do this. A temperature of about 21 degrees Fahrenheit is the ideal, and this device is in charge of ensuring that it is maintained. Some have a thermostat that may be adjusted to any desired temperature.

In addition to this, the gardener must be able to water their plantation, change the lights upward in the direction of plant growth, and transfer their plantation toward the garden once they are ready.

After that, we’ll discuss the timing and temperature.

How Early Can A Gardener Plant In A Greenhouse?

From March to April, you can start growing warm-season crops in the greenhouse. The frost-tolerance of these seeds is debatable, and their germination time is limited to no more than eight weeks. Higher-altitude farmers might wait until early April or May to plant their crops because springtime temperatures can be cold.

What Temperature Must The Greenhouse Be Kept At?

The temperature should be between 27 and 29 degrees Celsius. This ideal temperature is responsible for ensuring that the internal temperature range is as steady as possible.

The Right Temperature

There are a variety of heating systems in use in greenhouses, including those driven by gas and electric heaters, as well as those relying on the sun’s rays.


Then there’s the issue of ventilation to consider. There must be a necessity to regulate and balance temperatures in order to prevent the death of the plants in the hot, bright days.

Whether it’s a top vent that opens up to the ceiling hatch, a fan, or side vents that bring in cooler air and remove warm air, your greenhouses must have ventilation. You have the option of using vents that are either manually operated or automatically operated. Manual systems are less expensive but you must remember to shut down the vents and open the doors during daylight hours and keep this sealed at night.

When the weather suddenly shifts, this could become a problem for those who aren’t at home during the daytime and can find it stressful. An autonomous ventilation system could represent how your cooling and heating system might operate, as it will use sensors to turn on the heating if the temperature falls below a set point.

Assembling a Small Greenhouse Kit - Oak Hill Homestead

Greenhouse Cost and Types

You can extend your growing season in a variety of methods, and the cost, size, and complexity of each can vary greatly.

The first step in building a greenhouse is figuring out what you want to do with it: whether you want to use it for protecting transplants, growing potted plants, or growing plants all year round.

Greenhouses may reduce your grocery bill, which means they are an investment as well as an expense.

Low Priced Frost and Freeze Protection (Small and Budget Greenhouses)

  • For covering apertures, you can use glass, plastic sheeting, or polycarbonate panels.
  • Assemble a cold-frame out of repurposed windows, shower doors, and patio doors!
  • A cold frame serves as a “mini-greenhouse” for plants.
  • Similar to a cold frame, a “lean-to” greenhouse has a slanted roof, making it larger and easier to access.
  • A small greenhouse that may be taken anywhere.

It’s simple to construct a cold frame out of discarded windows and wood.

“Protecting Plants from Frost” has more information on cold frames and other small-scale methods of plant protection.

Mid-Priced (Small to Medium Sized Greenhouses)

  • Portable polycarbonate toolkit of modest size.
  • Garden in a window (indoor)
  • A Barn or A-Frame building
  • Arches in the Gothic style
  • a greenhouse
  • Hoops made from PVC and plastic that you can make on your own
  • Take charge of the situation. Plastic and 24 stud frame greenhouse

High Price (Medium to Large Greenhouses)

  • The Hoop house and the High Tunnel
  • Kits for big and medium-sized greenhouses
  • Gothic and conservatory architecture in their most formal forms
  • Polycarbonate or multi-wall hoop home
  • a four-season room attached (indoor)

Locating the Greenhouse

It doesn’t matter if you decide to build your own greenhouse or buy a ready-to-assemble kit; you still need to find the correct location. Use the following list to help you decide where you want to go.

Ordinances, Permits and Restrictive Covenants

No municipal rules, permits, or restrictions on greenhouse construction should be overlooked.


Avoid areas that are at risk of flooding or high runoff. Do a soil test if you plan to grow plants directly in the soil of your greenhouse. Keep an eye out for soil pollutants that could end up in your food.

In this case, soil is not an issue because you’ll be mounting your greenhouse on a concrete slab. See “Build a Secure Foundation That Preserves Your Growing Space” if you wish to skip the slab.


Keep in mind that the greenhouse may accumulate snow on and around it. A faulty foundation could be damaged by the building’s melt and freeze cycle.

Snow is heavy, therefore plan ahead to remove surplus snow or build a structure sturdy enough to withstand the weight of the snow..


Keep the greenhouse in full sunshine, especially if you live in a chilly region. Keep an eye out for seasonal variations in solar angles. In summer, the sun rises higher in the sky and sets lower.

Water and Electricity

Water is available in the greenhouse, so find it first. Hand watering, drip irrigation, or sprinklers are all options. If necessary, make it resistant to the effects of freezing temperatures.

Plan beforehand if you need power for irrigation, lighting, or heating.


High winds necessitate the use of an anchored and oriented greenhouse. A treeline, a windbreak, or even an earth berm can provide wind protection.

Keeping Your Greenhouse Working – What to Plan For During Operation

In order to build and use a greenhouse successfully, there are a number of factors to consider.

Overheating and Ventilation

The purpose of a greenhouse is to store heat, yet in hot weather, the greenhouse may become too hot. Your plants will die if you don’t provide them with adequate ventilation.

Additionally, mold and other diseases can be caused by poor air circulation, excessive humidity, and high temperatures.

Pest Control

It’s no secret that pests and plants both thrive in secluded areas.

These are some of the most common greenhouse pests:

  • Aphids
  • fungus
  • gnats
  • caterpillars such as cutworms
  • whiteflies
  • Insects of the coast
  • slugs
  • bloodworms

Snakes, shrews, and mice are all possible occupants.

Tips on pest management can be found in two books: The Ultimate Guide to Natural Pest Control in the Garden and The Best Ways to Get Rid of Mice.

Good Bugs, Fungus and Critters

The pollination of fruiting vegetables, flowers, and fruits requires the presence of pollinators. Pests can be controlled with the help of other helpful insects.

Mycorrhizal fungi can also be used to assist develop a healthy ecology in the soil or plants. Organic materials in your soil will encourage worms and other soil dwellers to thrive.


Make sure your plants don’t dry out by checking the soil moisture often and watering as needed.


Soil testing and amendment should be done on a regular basis. Moisture is better retained when there is more organic stuff. To learn how to build healthy soil, consult “Organic Fertilizers – How to Feed Your Plants, Soil, and Microbes”.

What you’re trying to grow will have an impact on the appropriate pH range. For the majority of vegetable plants, a pH of 6-7 is ideal.

Greenhouse shelving

Rust and rot-resistant shelves with drainage are a must. Among the possibilities are:

  • Drainage holes and powder-coated metal shelves
  • concrete blocks with wood plants growing on them
  • Fencing made of wire mesh with wooden frames

Consider using cedar if you’re building with wood, as it’s resistant to rot. To avoid chemical leaching into plants and your food, we don’t advocate using green treat in greenhouse shelving.

Build shelves that fit the typical 11′′ by 22′′ plant trays, or whatever containers you like to use for growing.

Greenhouse Sidewalls

You may need a 2- to 4-foot-high snow-resistant side wall in colder locations. Metal siding, wood panels, and cinder block are a few alternatives for exterior walls.

Raccoons, rabbits, and other vermin may be able to avoid it if you bury it at least a foot below ground level.

Heated & Insulated Greenhouses

There must be a source of heat for a greenhouse that can withstand temperatures below zero. Warm homes, hot houses, and conservatories are all terms used to describe heated greenhouses.

Heat Sources

These include hydronic heat (in floor heating), geothermal, hot compost bed heaters, electric fan heaters, propane gas heaters, and even a simple Ben Franklin stove.

Fires are more complex and generate greater temperature fluctuations. Rocket mass heaters and stone stoves emit heat more slowly, but they take up valuable space that could be used for gardening.

A thermostat-controlled powered heater is a simple but pricey solution. The amount of heat that can be generated by hot compost beds is restricted.


A “greenhouse within a greenhouse” can be created by using row covers (blankets, sheets, or “horticultural fleece”) on chilly nights.

Bubble wrap is an effective insulator for tiny greenhouses since it reduces heat loss while still allowing some solar gain.

Double Walls

A double-walled greenhouse helps prevent heat loss in colder climes. What we have here is a two-layered greenhouse. Extra insulation is provided by the trapped air between the plastic layers on the interior and outside.

This is more expensive, and it does create some venting issues in the summer, but it significantly reduces heat loss.

Thermal Mass

At day, thermal mass absorbs heat; at night, it expelas that heat. Earth, water bottles, and enormous water drums are all examples of this mass.

Earth Sheltering

The temperature of the soil below the frost line is rather constant throughout the year. It also serves as an insulator, preventing the temperature in the greenhouse from dropping too low.

One of the terms used to describe an earth-sheltered greenhouse is a “walipini”.

Digging a hole in the ground and covering it with plastic won’t produce a wonderful tropical oasis. It’s impossible for most people to build an underground greenhouse for just $300, even if they had the money.

On the south side of her garage, a friend near our home in northeast Wisconsin created a totally earth-sheltered greenhouse.

Several 50-gallon water barrels were added as thermal mass, as was a makeshift climate battery and a polycarbonate multiple-wall top. All but the most resilient plants succumbed to the freezing temperatures.

Greenhouses that are “underground” or “buried” can likewise be affected by water and collapse. Make sure you do a lot of research if you decide to go down this path.

Earth Berm

Traditionally, a greenhouse’s north side (south side in the southern hemisphere) is totally bermed or earth sheltered, while the east and west sides are only somewhat covered.

There are advantages and disadvantages to using an earth berm as an insulator, wind barrier, and thermal mass. Due to the lack of available area, it may not be suitable for urban or suburban settings.

How to Build a Greenhouse Using Plastic Bottles - Dengarden

Attached Greenhouse

Attaching a greenhouse to a house is another simple way to keep it warm in a smaller setting. On chilly nights, you can let the warmth of your house fill the space by opening the door between the two rooms.

If you have cats who enjoy hunting mice indoors, you’ll need a screen door. (As previously noted, mice adore comfortable, warm planting places.)

Because they’re so accessible, you’ll be more likely to visit and care for your plants on a frequent basis.

In addition, a greenhouse can be attached to a shed or other outbuilding. It is possible to use the outbuilding as an airlock as well as a place to keep gardening equipment and tools.

Advanced Greenhouse Concepts

Hydroponics and Aquaponics

Without soil, hydroponics is a method of growing plants that yields higher yields. Nutrient- and mineral-rich water is used to cultivate the plants. Aquaponics, a hybrid of hydroponics and fish farming, is a common practice.

Hydroponics and aquaponics require electricity, heat, and water to grow plants.

For more information about aquaponics, visit Aquaponics: Growing Fish and Vegetables Together.

Chickens, Coops and Greenhouses

You can find instances of chicken coops connected to greenhouses if you do a search. Warning: Be careful with this option!

In addition to being heavy in nitrogen, chicken feces also has a tendency to burn plants. To prevent the spread of disease, it is best to compost your chicken feces before using it in your garden.

A more realistic solution is Harvey Ussery’s decision to divide his greenhouse into an area for his chicks in The Small Scale Poultry Flock. During the off-season, you can give your chickens access to work the soil and remove bugs from the area.

In the winter, the runner ducks use our greenhouse-connected coop as a place to stay warm.

Ducks return to the pond during the day when the weather warms, and their droppings enrich the soil. In comparison to chicken droppings, the nitrogen content of duck feces is much lower.

Greenhouse Sheathing (Covers)


It is possible to create a barrier around a greenhouse using glass, polycarbonate panels or sheets of plastic.

MILs are used to measure the thickness of the plastic sheets. In technical terms, MIL stands for millimeter thickness, and higher values indicate greater tensile strength.

  • 4 million dollars will most likely only last one year.
  • 6 mm plastic can endure a few years.
  • For the enormous “high tunnel” hoop homes, 12 mil is the best choice.

You may be able to get superior rip and sun resistance with specialized plastic films that are available. The fact that it is greenhouse plastic should be noted in the product description.

It’s worth noting that the USDA offers grants to assist farmers in purchasing agricultural structures like hoop houses. Visit the High Tunnel System Initiative’s website to learn more.


Glass is a good material for covering greenhouses. It’s more expensive, but it lasts longer than plastics.

Regular or annealed glass is the least expensive, but it is more prone to shattering and causing a hazard for everyone in the vicinity.

Tempered glass is the next better alternative, but it is more expensive. Breaks into little square pieces and can withstand large temperature changes, making it four to six times stronger than conventional annealed glass.

The most expensive type of glass is laminated glass, which has two layers of glass laminated together with PVB (polyvinyl butryal) in between. When a laminated windshield is used on a car or a truck, it is incredibly durable, and it won’t readily shatter into pieces. Roofs and other high-load or high-impact surfaces can benefit from it.

The best windows for a greenhouse are triple-paned or triple-glazed, not double-paned. Most standard window warranties are null and void if utilized in this manner.

Fogging may be a problem if the seals on your old windows have been damaged or missing.

A UV inhibiting coating on modern house windows also means less light reaches your seedlings. Slows plant development as a result of this

Older windows may contain lead paint, making them unsuitable for use near food.

Free Greenhouse Reference Information

  • A guide on growing plants in Missouri greenhouses. Insect designs and identification are included in this comprehensive, free resource.
  • Small-scale commercial greenhouse design and layout
  • Tennessee’s Household Greenhouses
  • Extension Hoop Houses for Community Gardens: A Guide for Getting Started
  • Creating a Low-Cost High-Speed Rail System
  • Greenhouse Maintenance Manual

Need More Gardening Information?

Any queries or comments on gardening can be sent here.

The Common Sense Gardening website has a comprehensive list of all of our garden-related posts.

Wrapping up

Wisconsin is a great place to plant, and learning how to build a tiny greenhouse there necessitates paying attention to a number of factors that will help your gardening endeavors succeed.