October 29, 2026

What are some plants in the tundra?

Tundra plants include arctic willow, dwarf birch, purple saxifrage, moss campion, arctic poppy, cotton grass, Labrador tea and bearberry, with mosses and lichens filling the gaps between them. Almost all of them grow within a hand's width of the ground. Wind slows near the surface, and sunlit soil warms the air right above it, so a plant pressed flat sits in the warmest, calmest layer the tundra has. The same layering decides which corner of your yard frosts first.

Common tundra plants

The list below covers plants of the Arctic tundra and the alpine tundra above treeline. Each one shows a different way of living with cold.

• Arctic willow. A true willow that creeps along the ground in mats. Its catkins are covered in fine hairs.
• Dwarf birch. A shrubby birch that rarely grows above knee height. Its small round leaves turn red in fall.
• Purple saxifrage. It forms low mats and flowers very early, soon after the snow retreats.
• Moss campion. It grows as a dense, domed cushion studded with small pink flowers.
• Arctic poppy. Its cup-shaped yellow flowers turn to follow the sun across the sky.
• Cotton grass. A sedge with white, cottony seed heads. It grows in wet ground, often in tussocks.
• Labrador tea. An evergreen shrub whose leaves roll at the edges and carry rusty wool underneath.
• Bearberry. A trailing evergreen shrub with leathery leaves and red berries.
• Mosses and lichens. Mosses carpet the wet ground. Lichens, a partnership of a fungus and an alga, crust the rocks and feed caribou.

How staying low keeps a plant warmer

Air moving across the ground drags against it and slows. In the bottom few inches, wind carries heat away from a leaf far more slowly than it does at head height. When the sun strikes dark soil, the soil warms and heats the still air touching it. A plant lying flat bathes in that warmed air. A plant standing tall pokes into wind that strips heat off as fast as the sun adds it.

Height costs a tundra plant in winter too. Wind drives ice crystals across the snow surface, and they scour any shoot that sticks up. Exposed buds get abraded and dried out. At the edge of the tundra, trees that stand tall elsewhere grow as twisted, knee-high mats for this reason.

Cushions, hairs and dark leaves

Moss campion packs its short shoots so tightly into one dome that the air inside barely moves. Sunlight warms the surface of the cushion, and the trapped air holds that heat around the growing tips. Old leaves stay inside the cushion and rot slowly. They feed the plant and hold water.

Hairs work the same way at a smaller scale. The fuzz on arctic willow catkins and on woolly lousewort stems holds a film of still air against the plant. That film slows heat loss to the wind. Many tundra leaves also run red or purple. Those pigments absorb sunlight and shield the leaf's chlorophyll from strong light on days when cold has slowed photosynthesis.

The arctic poppy turns its flower to face the sun. The cup reflects light toward the center, so the inside of the flower runs warmer than the air around it. Insects bask there and pollinate it, and the extra warmth speeds the ripening of seeds.

Snow as a blanket

Fresh snow is mostly trapped air, and still air conducts heat poorly. Ground under a deep snowpack stays near freezing while the air above drops far below it. Tundra plants that sit under the snow spend the coldest months in that protected layer. The ones that suffer grow on wind-scoured ridges where snow never settles.

Short summers and stored energy

The tundra growing season is short and cool, so few plants can afford to start from seed each year. Almost all are perennials. They store sugars and starch in roots and stems. When the snow goes, they leaf out and flower fast, often from buds they formed the summer before. Evergreen leaves on Labrador tea and bearberry save the cost of building a new set every spring. Roots stay shallow, because permafrost lies below the thin layer that thaws each summer.

Before winter, these plants harden. Their cells move water out into the spaces between them and fill up with sugars, which lowers the temperature at which the cell contents freeze. Ice then forms outside the cells, where it does less harm. Garden perennials do the same thing on a smaller scale. Our guides on what happens inside a freezing plant and plant dormancy cover the steps.

The same physics in your yard

Your garden has its own surface layer, and it behaves like the tundra's. By day, a bed beside a south-facing wall or a stone path warms faster than open lawn. The masonry absorbs sun and blocks wind. By night the effect flips. On a clear, still night, the ground and leaves radiate heat to the open sky and cool below the air a few feet up. That's why frost coats the lawn on mornings when the porch thermometer never reached freezing.

Cold air is denser than warm air. On still nights it drains downhill and pools in hollows, at the foot of slopes, and against fences that dam its flow. Wind stirs the layers together and keeps that pool from forming, so breezy nights frost less at ground level. Trees overhead block the view of the sky and slow radiative cooling. Beds under a canopy often escape the first light frost for that reason. A cold frame borrows the cushion trick. It traps still air over plants and holds the soil's heat through the night.

Suppose your forecast says 34°F for a clear, calm night. Seedlings at soil level in a low corner can frost that night, while the forecast stays correct at thermometer height on your deck.

What our own garden showed

Our garden sits in zone 7a, and its published frost dates are April 28 and October 22. Our weather station runs colder than the forecast, and the offset Siltwell learned from it is minus 7°F. The first fall frost we recorded came on October 3, 2025, 19 days before the published date. The last spring frost we recorded in 2026 came on April 30. With our learned offset applied, our effective frost dates move to May 20 and September 30. That season is much shorter than the zone map suggests.

We plan around those numbers now. Peas and garlic went in during late March, because they tolerate cold the way tundra plants do. The tomatoes and peppers waited until the second half of May.

The tundra comparison tells you which way a spot in your yard leans. It can't tell you by how much. Only a thermometer near plant height, read on several still nights, gives you that size.

How to find your yard's cold spots

Start with your area. Over recent nights, the free microclimate checker sets the forecast model's lows beside the lows logged by home weather stations near you. It reports a range, a median, and how many stations it found. That result describes your neighborhood as a whole, and your own yard can run colder or warmer than it.

Then narrow it to your own ground. You can enter a microclimate offset by hand in Siltwell's garden settings, and frost alerts, which run on every account, adjust to it. On the paid plan, a connected weather station needs to overlap the forecast for about 14 days. Siltwell then learns your offset from the station's outdoor air temperature.

Walk the yard on the next clear, calm evening when the forecast low sits near freezing. At dawn, note where frost forms first and what sits there: a hollow, a fence line, open lawn far from walls. Move tender plants away from that spot, and give it to the cold-tolerant crops in our guide to winter-hardy plants.