Robinia vine stakes – trellising, vine stakes and end posts
Robinia series · Need: “equipping the vineyard”
Robinia (Robinia pseudoacacia) – also known as black locust, and often sold as acacia – is the most durable timber in Europe: use class 4, rot-resistant without any chemical or thermal treatment. In the vineyard, this changes the economics of the plot – a stake that pays for itself over some thirty years instead of being replaced every 10. Our stakes come from dense, slow-growing Romanian forests (a 40-year-old robinia rarely exceeds 30 cm in diameter): a particularly hard and dense wood, traced under FSC® certificate C153588. For the details of why this timber lasts without treatment, see the guide “Robinia outdoors – the complete guide”.
Four ways to train a vine – and what that means for the stakes
The French word for trellising, palissage, comes from the Latin palus, a stake. Trellising increases the leaf area exposed to the sun, improves the exposure and ventilation of the grapes and stops the vine from crowding – with a direct effect on yield, quality and the way the vineyard is worked. There are four main training systems, and each calls for different stakes.
No trellis (goblet-pruned bush vines). Two to five arms spread out from the trunk like a candelabrum: a system reserved for upright-growing varieties (Grenache, Mourvèdre, Picpoul, Clairette) and dry climates – in Châteauneuf-du-Pape, goblet pruning is even compulsory. Stake requirement: virtually none, apart from a planting stake for young vines.
Training on individual vine stakes. One stake per vine, up to 2.50 m: the tradition of steep, windy slopes – Côte-Rôtie, Condrieu, Hermitage, Saint-Joseph – where Syrah and Viognier, with their trailing habit, need support. On the most exposed plots, two vine stakes are sometimes tied together. The work is entirely manual, but the practice is enjoying a real revival among organic and biodynamic growers: the more abundant foliage shades the bunches and reduces water requirements.
Wire trellising. The norm today, widespread since the phylloxera crisis (1870-1900) and then the arrival of the tractor: galvanised steel wires stretched between rows of stakes. Three advantages – precise alignment for machinery, lifting a whole row in a single pass, and far fewer stakes than with individual vine stakes. Our planting stakes, line posts and end posts are designed for this system.
Tree-trained vines (hautains). The tree as a living support – an ancient practice (Pliny tells how, in Campania, the grape picker negotiated his fee in advance… and his tomb), still alive in the Minho, in northern Portugal, for vinho verde, and making a comeback with climate change: the tree’s foliage shades the vine, and its roots retain water and restore soil structure.
The three roles of the stake in a trellis
Planting stakes (or markers). Installed at planting, they keep the young vines in line, guide their growth and protect them when machinery passes – a role that rules out light materials such as PVC, bamboo or thin steel rods. They are removed once the vine is sturdy enough (after 3 to 10 years). A protective sleeve, slipped over the young vine and held by the stake, prevents damage from game.
Line posts. Set at regular intervals (every 4-5 vines, i.e. about 5 m), they support the lifting and fruiting wires that carry the weight of the foliage and fruit. They are driven vertically between the vines. Never exceed seven vines between two posts: the load on the wires does not decrease. Common sections: round, 6 to 10 cm in diameter, or sawn, 20 to 30 cm in circumference – sections specific to vineyards, slimmer than those of the fencing stake.
End posts. At the ends of each row, these anchor and tension the whole trellis: they need the strongest wood. Minimum diameter 10 cm (12-14 cm recommended), leaning 20 to 30° towards the anchor, and set at least 6 months before the wires are tensioned. To choose the length, add together the target height of the vine, the effect of the lean and the third that goes into the ground.
A special case is the vine stake: an individual stake up to 2.5 m, ideal on steep, windy ground. Choose the height according to the vine’s final growth, plus 30 to 70 cm in the ground depending on the soil, and a diameter sufficient to withstand the wind. Its durability (30 years or more of service to pay for itself) is robinia’s trump card.
The range
Our stakes are pointed at the factory unless otherwise stated when ordering – on four faces for square stakes, on three for triangular sawn stakes and with a conical point for round stakes. You also choose which end is pointed, narrow or wide, and the length of the point. Our timber is traced under FSC® certificate C153588; FSC® 100 % delivery must be requested when ordering.
Type | Lengths | Section | What for |
Markers / planting stakes | 0.5 to 1 m | circumference 9-18 cm | Planting; removed after 3-10 years |
Sawn stakes, bark on | 1.2 to 2.2 m | circumference 15-30 cm | Economical; bark on one side |
Sawn stakes, debarked | 1.2 to 2.2 m | circumference 15-30 cm | Clean finish; line and end posts |
Round stakes, debarked | 1.2 to 3 m | Ø 6-14 cm | Line and end posts; straight rounds |
Sawn stakes, planed | 1.5 to 2.2 m | circumference 25-30 cm | Top of the range (planed, chamfered) |
Good to know about the range. Markers are the cheapest: they are by-products of making long lengths. The debarked round stake, by contrast, costs more to produce than a sawn one: it takes a whole tree, straight and of small diameter – yet 20 to 30 years old – to make a single stake, whereas sawn stakes are cut from a larger trunk. For estates that care about the look of their rows, the planed and chamfered sawn stake is the prestige finish. A chamfered top is available as an option on most types.
Seven factors for choosing height and section
The right stake depends on the plot. Seven factors guide the choice:
Rainfall. It determines planting density – and never more than seven vines between two line posts, as the load on the wires stays the same.
Humidity. Low vines to limit evapotranspiration; high trellising to let air circulate where humidity is high – the height of the stake follows.
Frost risk. The coldest nights play out close to the ground: in frost-prone vineyards, higher trellising and taller stakes.
Soil type. Clay swells when wet and shrinks when dry: allow a larger diameter. Sand drains without holding water: fewer precautions. Stony ground: smaller sections and shallower setting.
Heat. The ground reflects heat: the more heat a variety needs, the lower its trellis.
Prevailing wind. Rows perpendicular to the wind need stronger stakes – the dangerous gusts come in spring and summer, when leaves and bunches catch the wind.
Variety and pruning. Trailing, semi-upright or upright habit; Guyot, Chablis or Royat cordon pruning: each means a different trellis height – and therefore different stakes.
Round or sawn for the vineyard?
For end posts, which take all the tension, a large round stake (Ø 12-14 cm) from a reasonably mature tree is ideal. For slim line posts, beware of the small 6-8 cm round stake: cut from a young tree, it is rich in sapwood and does not last as long as a sawn stake (or a sanded square stake) of the same section. We explain this in detail in the article “Round, sawn or split stakes – which to choose (sapwood and durability)”.
A “flex-and-return” wood that stands up to machinery
Robinia is both very strong and flexible: it bends under stress and then returns to its shape without breaking. This is decisive in the vineyard, where the stake takes knocks from the grape harvester, the pre-pruner and sensor-arm under-vine cultivators without snapping. Good to know: when a stake does eventually give way, it breaks at ground level (the zone where air and moisture alternate), not deeper down.
Installing your stakes properly
Drive in by a third. Allow about one third of the stake’s length in the ground; more for end and corner posts.
Lean the end post. 20 to 30° outwards from the row, set 6 months before tensioning the wires, so that the soil has time to settle around it.
If you use concrete: a collar, not a plug. Pour the concrete as a collar around the stake, sloping outwards so that water runs off, and keep the tip of the stake in the soil beneath the concrete. A foot sunk in a cup of concrete holds water and rots faster.
Galvanised or stainless steel wire. Robinia is slightly acidic and corrodes ordinary steel: choose good-grade galvanised or stainless steel wire.
The service life that changes the economics of the plot
In ground contact, robinia is credited with around 30 years, compared with about 15 years for untreated sweet chestnut and 10 years for untreated oak. Over the life of a vineyard, the difference in cost – and in replacement labour – is considerable, with no chemicals in contact with the soil.
Frequently asked questions
What diameter for an end post?
At least 10 cm, ideally 12 to 14 cm, leaning at 20 to 30° and set 6 months before the wires are tensioned.
Does robinia stand up to the grape harvester?
Yes. Its “flex-and-return” flexibility allows it to absorb knocks from machinery (harvester, pre-pruner, sensor-arm under-vine cultivators) without breaking.
Planting stake or line post – what is the difference?
The planting stake (marker) supports the young vine at planting and is then removed; the line post stays in place permanently to carry the trellis wires.
How far apart should line posts be?
Generally every 4 to 5 vines, i.e. about 5 m. The end posts, sturdier and leaning, go at the ends of the row.
Further reading
Reference guide: “Robinia outdoors – the complete guide”. See also “Round, sawn or split stakes – which to choose (sapwood and durability)”.
Our products: Round stakes · Agricultural posts · Markers · Square stakes.
Source: range and trellising data based on piquetvigne.fr (Acacia Bois).
Contact: One row to equip, or a whole plot? Send us the length of row and the training system, and the quotation will follow.
Disclaimer. Non-contractual article, provided for information only (photos and drawings included). Robinia is a natural material: the values given are orders of magnitude and may change without notice; in case of discrepancy, only the product’s technical data sheet and the general terms of sale apply. Always check the regulations that apply to your project.
© Xylo Impact SRL — all rights reserved, products marketed under the Acacia Poles brand. Any reproduction, even partial, is prohibited without prior authorisation.
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