Arbor Day, observed on the last Friday of April in most of the United States, is the country’s oldest holiday devoted to a single, hopeful act: planting a tree. It began in Nebraska in the 1870s, when settlers on the treeless plains reportedly planted an enormous number of trees in a single day. The premise still holds, the best day to plant a tree was decades ago, and the second best is today.
Why one tree matters
A single mature tree does a startling amount of quiet work. It shades and cools, slows stormwater, filters air, and shelters birds, insects, and small mammals through the seasons. Trees planted on the sunny side of a house can cut cooling costs, and a street lined with them is measurably more pleasant to walk. Over its lifetime a tree also stores a meaningful amount of carbon, quietly working long after you have forgotten the afternoon you planted it. You may not sit in its full shade, but someone will.
Choose the right tree for the spot
The most common planting mistake is picking a tree that outgrows its place. Before you buy, look up and out: note power lines, foundations, and how wide the canopy will spread in thirty years. Favor species native to your region, which support far more local wildlife and shrug off local pests and weather. Your county extension office or a local nursery can steer you toward trees that will actually thrive where you live.
Plant it so it lasts
Dig a hole two to three times as wide as the root ball but no deeper than it, since trees planted too deep struggle for years. Loosen the roots, set the trunk flare at soil level, backfill with the native soil, and water deeply. Spread mulch in a ring around the base but keep it off the trunk, and skip the volcano of mulch you see in so many parking lots. Then water regularly through the first two summers while the roots establish.
Make it a tradition
Arbor Day is most powerful as a habit. Plant a tree for a birth, a loss, or simply a spring, and watch it mark the years alongside you. Bring kids along; a child who plants a sapling tends to guard it fiercely. If you have no ground of your own, many towns hold community plantings, and tree-focused nonprofits will put your donation in the soil for you.
How to celebrate
- 1Plant a tree
Do the thing the day is named for. A bare-root or potted native tree, a shovel, and an afternoon is all it takes. You may never sit in its full shade, but someone will.
- 2Right tree, right place
Look up and out before you dig: note power lines, foundations, and how wide the canopy spreads in thirty years. Pick a species native to your region so it supports wildlife and shrugs off local weather.
- 3Plant it properly
Dig a hole two to three times as wide as the root ball but no deeper. Set the trunk flare at soil level, backfill with native soil, and water deeply. Mulch in a ring, but keep it off the trunk.
- 4Water through year one
Newly planted trees need consistent water for the first two summers while roots establish. A slow soak once or twice a week beats a daily sprinkle. A watering bag makes it nearly foolproof.
- 5Make it a tradition
Plant a tree for a birth, a loss, or simply a new spring, and let it mark the years with you. Bring a child along; a kid who plants a sapling tends to guard it fiercely.