Japanese
Begonia, Brugmansia, Colocasia, Gardenia, Pelargonium, standard fuchsia and will enjoy the better light levels in a heated conservatory during winter which may not be available in the house.
With a cold hardiness down to -30 F, the winterberry will not only grow in the cold, it will thrive. The snowdrop flower. As a plant that actually despises warm winters, the snowdrop flower performs its best in frigid temperatures. This flower can withstand temperatures down to -30 F.
Pansies. Remarkable as a winter plant, Pansies can survive freezing coldness and can thrive vigorously when summer returns. Its “smiling face” flowers are vibrant in color and fragrance that can fill up your space with so much joy.
Mulch helps keep plants moist and warm and protects the roots of newly-planted trees, shrubs, flowers and vegetables. If frigid weather suddenly crops up in Northern Utah, make sure your plants have the right amount of mulch.
And they do just fine. The key to success with garage storage is that this area is attached to the house but not heated. The garage never goes below 32 degrees but tends to hover in the 40's and low 50's all winter. This keeps the plant dormant but the plants never freeze.
Fall and Winter LEAFY GREENS
A beautiful sampling of some of the leafy greens you can grow in your fall and winter garden, including different varieties of kale, spinach, lettuce, chicory, and even wild chickweed! Spinach is a very fast-growing, cool weather vegetable.
Bright reds, soft pinks, sunny yellows –– these colors can still pepper your lawn, even when there's snow. You just need winter flowers that bloom in the cold. Viola, winter jasmine, calendulas, and many plants love cooler temperatures, and they don't hesitate to take advantage of winter's pollinators.
SNOWDROPS (Galanthus nivalis)
True to their name, these early-blooming bulbs often emerge while snow is still on the ground to provide a breath of fresh air for winter-weary gardeners. In mild winters, snowdrops can flower as early as late January, but February or March is more common.
Take Special Precautions for Potted Plants
To protect them, you can wrap the pots in an insulating material (think burlap, old blankets, or even bubble wrap), place them close to the foundation of your house, and arrange them close together. You can also put a layer of mulch over them for added protection.
Most houseplants are tropicals and prefer temperatures between 65-75°F during the day and about 10 degrees cooler at night. For many plants, temperatures below 50°F can cause problems. Adjust thermostats to cater to your comfort, but remember your plants need some consideration.
Most potted or hanging plants, like petunias, are fine as long temperatures don't dip below 39 degrees, and especially if the temperature doesn't dip to the freezing mark.
Putting old blankets or plastic sheets at the coldest point of the night or placing soil mulches on the pot are possible ways to cover your plants. This would trap the heat while protecting them from chilly winds; just make sure to unwrap them during the day.
A space heater or solar lamps is all you need to keep the garage warm enough for plants to thrive. Keep in mind that the hotter the room is, the more light and water your plants will need. So you only need to keep the room above freezing for your plants to grow.
I have used old pillow cases, sheets, towels and even cardboard boxes. Just be sure that whatever you use to cover your plant, the cover reaches the ground and traps the warm air inside the canopy. Plastic can be used but it is important to note that you should not let the plastic touch your plants.
Seal up those windows
Many plants, especially tropicals, are sensitive to cold air. They'll drop leaves like crazy when it gets drafty! To fix this problem, make sure your windows are sealed and insulated, or that your plants are moved out of the reach of cold drafty areas like windowsills and doorways.
With reduced sunlight and dry air from indoor heating, winter isn't a time when your plants will thrive, but, with the right care, they can certainly survive. “Less sunlight typically sparks a plant's natural dormancy,” says Casey Godlove, creative director at PlantShed.
Leafy vegetables like cabbage, lettuce, kale, collards, and chard can tolerate some frost. Early spring blooming flowers like crocus, snowdrop, and primrose can all survive the winter, and pansies are especially resilient.
So what's the solution… Focus on frost hardy annuals. Some of these annuals that can withstand 20 degrees or so, including pansies, snapdragons, dianthus, alyssum, dusty miller, viola, and osteospermum. Keep in mind that flowers may be a bit ragged after such cold but the plants should make it through ok.
Choose The Right Containers
Terra-cotta and ceramic pots absorb moisture, which expands as it freezes and cracks the container. Metal, concrete and wood containers typically handle freezes well, as do fiberglass and resin pots. Some plastic pots also survive winter fine, but may become brittle over time.
A covered porch usually provides protection from light frost, but the garage or sun room is better for freezing temperatures. A couple days in darkness won't hurt the plant. Or move them out during the day and back in at night, if cold temperatures persist.