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Size, spacing, and two seasons
Planting a row of trees is three decisions made in the right order: pick a stock size your planting date allows, space for the crown the tree will have at maturity, and budget two full seasons of water and pruning. This page walks each decision with the numbers the nursery trade actually uses.
The calendar decides which stock formats are even available to you.
Bare-root is the most economical way to buy a long row and the least forgiving: the stock is lifted while dormant and must go back in the ground between late autumn and early spring. Planting bare-root in summer causes severe transplant shock, and that mistiming is the single most common cause of first-year failure.
Balled-and-burlapped stock is dug with its root ball intact — 10 to 12 inches of ball diameter for every inch of trunk caliper — then burlapped and wire-tied. It is heavier to handle but far more flexible about timing than bare-root.
Container stock follows US nursery trade sizing: a #1 pot holds about 2 gallons, a #2 about 5, a #5 about 15, a #15 about 25. If your planting date falls outside the dormant window, container or B&B stock is the format that gets the row in the ground.
Field-grown trees are sold by caliper; containers by a number that is really a volume.
Caliper is the trunk diameter measured 6 inches above the ground. A 1-inch caliper tree stands roughly 8-10 ft tall; a 2-inch tree roughly 12-15 ft, with the exact height depending on species and the growing season it came out of.
Container numbers are not gallons, but they track them closely: #1 is about 2 gallons, #2 about 5, #5 about 15, #15 about 25. The number tells you root mass and handling weight, not how tall the tree is.
Match size to the job rather than to impatience. Bigger stock gives a taller tree on day one, but every extra inch of caliper adds 10-12 inches of root ball and another 10 gallons to the weekly water budget of the first season.
Spacing is set by mature crown spread, never by the size the tree ships at.
Find the species' mature spread and plant on that number: a tree that will hold a 20 ft crown goes 20 ft from its neighbor, even if it arrives as an 8 ft whip.
In a square layout, 20 ft spacing gives each tree 400 sq ft of ground. The same 20 ft spacing on a triangular, staggered grid tightens that to about 346 sq ft per tree while keeping the same trunk-to-trunk distance.
The common failure is spacing by the shipping container: a row planted to look full in year one has to be thinned within a decade, and thinning is a cost that correct spacing would have avoided entirely.
Space for the crown the tree will have at maturity, not the one it ships with.
A stake that stays past its first season trades a straight trunk for a weak one.
| Stock format | Size label | What the label means | Field note |
|---|---|---|---|
| Field-grown | 1-inch caliper | Trunk 1 in across at 6 in above ground; roughly 8-10 ft tall | Height shifts with species and growing season |
| Field-grown | 2-inch caliper | Trunk 2 in across; roughly 12-15 ft tall | Budget 20 gal of water per week in season one |
| Container | #1 | About 2 gallons of root volume | The number describes volume, not height |
| Container | #2 | About 5 gallons | More root mass, not necessarily more height |
| Container | #5 | About 15 gallons | Mid-size landscape stock |
| Container | #15 | About 25 gallons | Plan handling before the delivery arrives |
| Balled-and-burlapped | 1-inch caliper | Root ball 10-12 in across, burlapped and wire-tied | Burlap stays on at planting |
| Balled-and-burlapped | 2-inch caliper | Root ball 20-24 in across | Carry by the ball; a cracked ball is a failed planting |
Most planting failures are handling failures that happened before the hole was finished.
A B&B ball must not crack: carry the tree by the ball, never by the trunk, and set it into the hole before loosening anything. The burlap stays on at planting — it is part of the planting, not packaging to be removed.
Bare-root stock goes in while dormant, with roots kept moist until the moment of planting. A bare-root tree planted in summer is a transplant-shock case, and transplant shock is the single most common cause of first-year failure.
The first pruning happens at planting time: remove competing leaders so the tree puts its first season of growth into one trunk instead of splitting it between rivals.
Water weekly, stake only if the trunk moves, prune once a year — in that sequence.
Water is the non-negotiable: about 10 gallons per inch of trunk caliper per week through the first growing season, delivered slowly so it soaks the root zone instead of running off. Sandy soil needs roughly twice the frequency of clay for the same weekly volume.
Stake only where wind exposure or trunk movement is a real problem. A staked tree fails to develop the flexure that makes it wind-resistant, so stakes come out after one season — left longer, they trade a straight trunk for a weak one.
Prune once a year, in early spring before bud break, when wounds stay small and callus grows fast. After the competing leaders come out at planting, the tree is shaped annually on that same early-spring date.
The figures here reflect widely used nursery trade standards rather than any single publication, catalog, or grower.