Building a 16-Foot Freestanding Apple Espalier Trellis with 12-Gauge Galvanized Wire: Posts 8 Feet Apart, Wires at 18, 36, and 54 Inches, and 54 Feet of Wire

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Set 3 rot-resistant posts 8 feet apart, run 12-gauge galvanized wire between them at 18, 36, and 54 inches, and tension each wire with an eye screw and turnbuckle. Plant 2 dwarf apples of different varieties, one in the middle of each 8-foot bay, 8 feet apart.

What wire and spacing does an apple espalier trellis need?

Use 12-gauge or heavier galvanized wire between posts 8 feet apart. Put the first wire 18 inches above the ground and add two more, each 18 inches higher, for three tiers. Tighten each wire with eye screws and turnbuckles, and build the whole trellis before the trees go in.

Oregon State University Extension's espalier article sets posts 8 feet apart with 12-gauge or heavier galvanized wire. The first wire is 18 inches above the ground, with typically three levels 18 inches apart and a 1- or 2-year-old dwarf tree planted in the middle.

UC Marin Master Gardeners' how to espalier guide calls for 12- or 14-gauge wire with eye screws and turnbuckles, and rot-resistant or metal posts. It spaces fruit trees 6 to 8 feet apart, asks for at least 6 hours of sun, and notes most apples need a second variety for pollination.

Wire and Hardware for a 16-Foot, 3-Tier Trellis

Item Per tier For 3 tiers
Wire height 18 / 36 / 54 in. 3 wires
Span 16 ft. 48 ft.
Wire cut, with 1 ft. per end for wraps 18 ft. 54 ft.
Eye screws, one per post 3 9
Turnbuckles, one end only 1 3

The middle post's eye screw only guides the wire, so each tier runs as one continuous 16-foot strand.

Materials and Tools

  • Hillman 12-gauge utility wire, at least 54 feet; check the length on the spool label
  • Three 8-foot treated, cedar, or redwood 4x4 posts, plus concrete for each hole
  • Two 8-foot 2x4s as a top rail across the posts
  • Nine eye screws and three turnbuckles
  • Two dwarf apple trees of different varieties that bloom at the same time
  • A post hole digger, a level, fencing pliers, soft plant ties, gloves, and safety glasses

Build Steps

  1. Pick the row. Choose a spot with at least 6 hours of sun and good drainage.
  2. Set the posts. Set the 3 posts 8 feet apart in a straight line, deep enough to leave at least 60 inches above the soil, and crown the concrete above the soil line.
  3. Add the top rail. Screw the 2x4s across the post tops to tie the 3 posts together.
  4. Mark the tiers. Mark each post at 18, 36, and 54 inches above the soil.
  5. Install the hardware. Turn an eye screw into each post at each mark and hook a turnbuckle, opened fully, to one end post at each mark.
  6. Run the wire. Wrap one end around its eye screw, pass it through the middle eye, and wrap the other end on the turnbuckle.
  7. Tension it. Tighten each turnbuckle until the wire is taut, leaving thread for later adjustment.
  8. Plant the trees. Set one tree in the center of each bay, 4 feet in from each end post.
  9. Train the first tier. Tie one supple branch left and one right to the 18-inch wire with soft ties.

Espalier Mistakes

  • Planting first and building the trellis around the roots
  • Wire tied directly to branches, which cuts in as they thicken
  • Forcing laterals down to the wire in one day; lower them in stages about 2 weeks apart
  • One apple variety with no pollinator nearby

Running wire between posts uses the same moves as building a two-wire raspberry trellis. Young trunks still need bark protection, as in rabbit- and vole-proofing young fruit trees.

The hardware cloth mesh size and gauge guide explains why 12-gauge is thicker than 14-gauge.

Post holes for the trellis are dug the same way as in hand-digging 8-inch holes for wood line posts.

FAQ

Do I have to string all three wires the first year?

No. Oregon State says you can add one level each year as you train the next tier.

Can the wires go on an existing fence?

Yes. UC Marin sets wall-mounted supports 6 to 8 inches out for air flow and room to tie and prune, and the same gap works on a fence.

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