Professional substrates for growers who work at scale
Arber is an Italian producer of professional substrates and growing media. 500+ formulas for horticulture, floriculture, ornamental nurseries, landscaping, and sports turf. Selected peat from the Baltic countries and Germany, extracted from the same fields year after year. Custom mixes available. Delivery worldwide. 30 years of selected supply chain. Seven million cubic metres produced since 1996.
Arber Pro substrate: what sets it apart
A professional substrate is the technical foundation that determines yield and crop quality — not a bag of potting soil. It delivers calibrated water retention, a porous structure that maintains root gas exchange even when wet, and pH and EC values within crop-specific windows. Batch-to-batch consistency lets you replicate results season after season.
Arber works with block-cut peat from selected origins in the Baltic countries and Germany. It is extracted from the same fields year after year. This supply chain continuity is what makes batch parameters predictable. The peat is then combined with mineral structure agents (pumice, perlite, vermiculite, expanded clay, volcanic Lapillus), complementary organic matter (wood fiber, coconut fiber, mature green compost), and crop-calibrated base fertilization.
On top of this foundation sits the technical work — the part that separates a substrate manufacturer from a reseller: control of the formula, and QC on every batch. The catalog contains 500+ formulas — from the DX seeding line through the Unipot line for winter repotting to Forest X for long outdoor cycles. Custom mixes are available for volumes compatible with your production cycle. Agronomic support is provided before and during the season. Pallet or Big Bag delivery — by truck, container or intermodal. No full-truck requirement. (In Italy, 15 zone agents coordinate orders.) To see who is behind the formulas, read how Arber works as a professional growing media supplier.
Find the substrate for your production
The Pro catalog is organized by production type. Choose your production category to reach the substrate families calibrated to your cycle, technical comparison tables, and FAQs from buyers like you.
Vegetable seedlings
Substrates for horticulture, professional seedling nurseries, and seeding growers. Fine granulometry (particle size), high blonde peat content, calibrated buffer capacity at pH 5.5–6.0, lot-to-lot predictability.
See substrates for vegetable seedlings → Floriculture · Container growing · Ornamental nurseriesPotted plants
Substrates for floriculture, container growing, ornamental nurseries, and garden centers. Blonde/brown peat blends with structure agents for cycles of 3 to 18 months on benches or under cover.
See substrates for potted plants → Outdoor nursery · Open ground · LandscapeOutdoor plants
Outdoor ornamental nurseries, soft fruit, landscape contractors. Medium-coarse granulometry (particle size), wood fiber and structure agents, long outdoor cycles in containers Ø 14 cm and above.
See substrates for outdoor plants → Sports fields · Landscaping · Construction sitesSports turf and landscaping
Landscape contractors, sports fields, green roofs, nurseries with mulching. Top soil, aggregates, and organic matter for load-bearing capacity, drainage, and durability.
See substrates for sports turf and landscaping →Browse the catalog by production phase
The same catalog, organized by the moment in your cycle when the substrate enters your operation. Each link leads to the product archive filtered by phase. To see how substrate requirements shift from sowing to long cycles, start with the guide on how to choose the substrate for each growing stage.
Sowing
Germination substrates, pressed plugs, and tray cells. Fine granulometry (particle size), calibrated buffer capacity.
See substrates for sowing →Container growing and repotting
Substrates for repotting in containers from Ø 8 cm upwards. Blonde/brown peat blends with structure agents for 3–18 month cycles.
See substrates for repotting →Landscaping and sports fields
Top soil, blends for green roofs, formulas for load-bearing capacity and drainage on outdoor construction sites.
See substrates for landscaping →Specific formulas
Ericaceous, blueberry, cacti, poinsettia, dipladenia. Recipes calibrated to the specific crop.
See specific formulas →Professional mulches
AR Containermulch and other mulches for ornamental container growing. They reduce evapotranspiration and weed pressure.
See professional mulches →Raw materials
Blonde peat, black peat, pumice, perlite, vermiculite, wood fiber, volcanic Lapillus. For growers who mix on site.
See raw materials →Substrate families — at a glance
Eight formula families to help you navigate the catalog. Each row links to the lead SKU page for that family, with full specifications, label, and sample request.
| Family | Main use | Granulometry (particle size) | Typical audience | Lead SKU |
|---|---|---|---|---|
| DX | Sowing, tray cells, seedling nurseries | Fine 0–10 mm | Seedling nurseries, seeding growers | DX Seeding → |
| Forest | Repotting potted plants, medium cycles | Medium 0–25 mm | Ornamental nurseries, container growing | Forest → |
| Forest X | Repotting outdoor plants, long cycles | Coarse 0–40 mm | Outdoor nurseries, landscape | Forest X → |
| Forest FR Type 3 | Outdoor repotting with wood fiber structure, very long cycles | Coarse 0–40 mm + fiber | Outdoor nurseries, containers Ø 25 cm and above | Forest FR Type 3 → |
| Unipot / Unitorf | Multi-crop container growing, medium cycles | Medium 0–15 mm | Floriculture | Unipot Medium → |
| Florigen / Minipot / Press | Fine container growing, pressed plugs, mini-pot | Fine 0–8 mm | Intensive container growing, tray cells | Press → |
| Specialty (Acid · Camelia · Blueberry · Cacti · Poinsettia) | Crop-specific formulas | Calibrated by crop | Specialist nurseries | Acid → |
| Bio | Organic substrates (EU Reg. 2018/848) | Medium, calibrated | Certified organic supply chain | Bio Seeding → |
Technical material for informed decisions
Standard definitions, supply chain overview, and direct contact with your regional agent. Use these to complete your technical decision with the broader picture.
Technical terms in the substrate sector
Von Post, EC, granulometry (particle size), water retention capacity, RHP, HORTICERT — standard definitions with operational meaning.
SustainabilitySelected supply chain, regulated extraction
What “selected peat from the Baltic countries” means, how extraction is regulated, and where the peat-free pathway is heading.
Regional agentFind the agent for your region
15 zone agents for Italian customers · export team for international. On-site visit, technical audit, and pilot lot on compatible volumes.
What growers ask before switching to Arber
Seven recurring technical and commercial questions, collected by regional agents during on-site visits.
Is Arber a substrate manufacturer?
Yes. Arber is an Italian producer of professional substrates: the 500+ formulas are developed and owned in-house, every batch is QC-verified, and the products ship under the Arber brand from Italian logistics sites. Block-cut peat from selected origins in the Baltic countries and Germany, extracted from the same fields year after year, keeps batch parameters predictable.
Can I get a custom formula?
Yes. For volumes compatible with your production cycle, we develop custom formulas based on your crop, irrigation system, container type, and location. The process starts with a technical request to your regional agent, who collects the key parameters on site. The first pilot lot typically arrives within 3–4 weeks.
How does an Arber Pro substrate differ from a commercial one?
Three concrete differences you see in the field. First, the block-cut peat: it is cut in blocks and maintains a more stable structure compared to milled peat, which compacts faster when wet. Second, supply chain continuity: the same extraction sites year after year, giving batch-to-batch consistency so you can replicate results season after season. Third, fertilizer and pH calibration at the point of bagging — not a generic “around 6”: every batch leaves with a technical data sheet and verified parameters.
Do you hold supply chain certifications?
Yes. The German part of the supply chain is HORTICERT certified, the sector scheme that verifies ecological, social, and economic sustainability. Selected professional raw materials are certified under the RAL procedure of the Gütegemeinschaft Substrate für Pflanzen. The organic lines (Bio substrates) use FiBL-approved raw materials and operate in compliance with EU Regulation 2018/848. The technical data sheet for each substrate family lists the applicable certifications.
How long does delivery take across Italy?
We deliver across Italy, with logistics organized to keep lead times short. Transport is included in the price to your gate. There is no full-truck requirement: we ship pallets, multiple pallets, or Big Bags depending on the format you need. Typical lead time is 3–7 working days, depending on your region and lot availability.
What does agronomic support include?
It includes an on-site visit from your regional agent, a technical audit of your current substrate and growing system, and a formula proposal. Where volumes justify it, a pilot lot runs in one section of your greenhouse or site before a full switch. During the season, the Arber agronomy team is available by phone or on-site visit for batch anomalies, complementary fertilizer rates, irrigation issues, or observed pH drift.
Can I receive a sample before ordering?
Yes. For each lead family we send a 70 L bag (or the smallest available format equivalent) for on-site testing — pilot sowing, bench filling, or load-bearing trial on site. The sample arrives with a technical data sheet and batch parameters. Request a sample directly from the SKU page that interests you, or through your regional agent.
Ready to compare your current substrate with Arber?
On-site visit from your regional agent, technical audit, pilot lot in one section of your greenhouse or site. No commitment and no full-truck requirement on the first order.