For blackberries we build single and multibay tunnels with legs and ground anchors in E370+Z275 steel. We match the tunnel type, bay width and height to the plantation during a visit to the field.
Blackberry canes are very susceptible to frost damage. The integrated production guidelines for thornless blackberry (GIORiN, Poland, 2023) recommend that attractive foreign varieties whose canes have low frost hardiness be protected over winter or grown in a polytunnel.
A tunnel also protects the fruit from rain. According to the NC State Extension guide (2023), growing under cover can extend the harvest season, improve fruit quality and yield, and reduce leaf wetness and disease — and the fruit can be picked even in the rain. This matters for grey mould, which according to the guidelines occurs mainly on the fruit, with its spores spreading during rainy periods.
Blackberries are trained on wire supports, so the tunnel has to leave room above the rows and stand firm throughout the season. We make the legs and ground anchors from E370+Z275 steel — about 10% stronger than classic S350+Z275, at the same price.
We match the bay width — from 6 to 11 m in 0.5 m steps — and the tunnel height to the row spacing and the supports on the plantation.
We settle the structure in the field, during a visit from our sales advisor. These are the two types we build.
For blackberries: when the structure is to be moved to another field.
| Structure | hoops on ground anchors screwed into the soil |
|---|---|
| Ground anchors | 700, 850, 1000 mm; upset anchors 1.25–2.0 m; steel E370+Z275 |
| Hoop tubes | Ø40, Ø50.8, Ø60.3 mm; oval 80×40, 90×50 mm; steel S350+Z275 |
| Height | up to 5 m on upset anchors |
| Width | 6–11 m, round or gothic arch |
| Price | from €6.40/m² net (steel structure with film, excluding transport and installation) |
For blackberries: larger plantations — shared legs, gutters, lower cost per m².
| Structure | Y-legs screwed into the soil |
|---|---|
| Legs | Ø40, Ø50.8, Ø60.3 mm; length 2.5–3.5 m; steel E370+Z275 |
| Hoop tubes | Ø40, Ø50.8, Ø60.3 mm; oval 80×40, 90×50 mm; steel S350+Z275 |
| Gutters | between the bays, rainwater collection |
| Width | 6–11 m, round or gothic arch |
| Price | from €5.30/m² net (steel structure with film, excluding transport and installation) |
Legs and ground anchors in E370+Z275 steel, hoops in S350+Z275 steel. We state the specifications plainly.
E370+Z275
E370+Z275 steel is about 10% stronger than classic S350+Z275 — and it costs you the same.
| Legs | E370+Z275 |
|---|---|
| Ground anchors | E370+Z275 |
| Hoops | S350+Z275 |
| 90×50 oval tube | +29% strength |
Lattice cables are standard in multibay tunnels; the ridge tube is standard in single tunnels. You add T or V horizontal bracing as an option for both types.
Standard in multibay tunnels
They hold the tunnel in the wind and partly take the load off it under snow.
Standard in single tunnels
It stiffens the tunnel from above and stops the arches from spreading.
Option in both types
It strengthens the tunnel most against snow.
Strongest combination in multibay tunnels
Lattice cables + horizontal bracing
Best in a T or V variant — both are similarly effective. The cables hold the tunnel in the wind, and the bracing together with the hoop forms a truss that carries the snow.
Reinforcements in detailMultibay tunnels: from €5.30/m² net for the steel structure with film.
The price excludes transport and installation. Installation: from €1.90/m² net. Single tunnels: from €6.40/m² net.
Price list and what affects the pricefrom €5.30/m²
net, steel structure with film, excluding transport and installation
You call, write or fill in the configurator: crop, field dimensions, timing.
We match the tunnel type, bay width, tube profile and arch shape to the crop and the conditions in the field.
We make the structure and accessories at our own plant in Bralin (Wielkopolska Voivodeship) — about 10 ha of tunnels per month.
We bring the packed parts to the field, and the tubes are bent on site, at the customer's. Transport is quoted separately.
We install the tunnels as a full service or support your crew with our fitter. Installation: from €1.90/m² net.
The integrated production guidelines for thornless blackberry (GIORiN, Poland, 2023) state that blackberry canes are very susceptible to frost damage, and recommend that foreign varieties with poor frost hardiness be protected over winter or grown in a polytunnel.
We choose the type to suit the plantation during a visit. Multibay tunnels — bays on shared legs, with gutters — work out cheaper per m² on larger areas. A single tunnel is easier to relocate, and it is warmer inside.
Multibay tunnels: from €5.30/m² net. Single tunnels: from €6.40/m² net. Steel structure with film, excluding transport and installation.
Call or configure a tunnel online — a sales advisor will get back to you with an offer.
