Grafting platforms for vegetables

01Overview and value chain

Markers: [EC: Plant health & phytosanitary rootstock standards | OECD: Agricultural biotechnology | Regulator: USDA-APHIS (US), EFSA (EU), MARA (China)]

Grafting platforms join a high-yield vegetable scion (tomato, watermelon, melon, cucumber) onto a wild rootstock bred for disease resistance and a vigorous root system, solving the soil-pathogen problem left by the phase-out of the methyl bromide soil fumigant without any genetic modification. Rijk Zwaan (Netherlands) breeds tomato rootstocks carrying Tm-1-based resistance to tomato brown rugose fruit virus (ToBRFV), a soil- and contact-transmissible virus that has become one of the industry’s most pressing threats, and in April 2026 showcased high-resistance tomato varieties engineered to hold yield and fruit quality on par with non-resistant lines. Syngenta doubled its market share of ToBRFV-resistant rootstocks in southeastern Spain by June 2026, with several million rootstocks planted across the Almería, Murcia and Costa de Granada growing regions. Smart Sowing Systems (Netherlands) makes the SGM automatic grafting machine, which gained attention in Japan in 2026 after robotics distributor Iwatani selected it for an end customer and a regional trade forum featured it among the leading automatic grafters on the market. In the US, Clemson University’s Edisto Research and Education Center runs the Carolina Strongback grafted-rootstock program, evaluating grafted watermelon nursery plants for fusarium wilt control as part of the broader USDA-coordinated vegetable-grafting research effort.

The key directions of grafting platforms for vegetables are:

1. Disease-resistant rootstock breeding: developing wild rootstock lines resistant to soil-borne pathogens (fusarium, nematodes) and emerging viral threats like ToBRFV, without altering the scion variety’s fruit traits.
2. Robotic precision grafting: machine-vision-guided robotic arms that cut and align the vascular bundles of scion and rootstock seedlings for a clean, high-survival graft union.
3. Healing-chamber conditioning: climate-controlled chambers that hold humidity and temperature at levels that maximize graft-union survival during the critical post-grafting healing period.
4. Biodegradable grafting clips: silicone or biodegradable clips that hold the graft union in place during healing and release naturally as the stem thickens.

Sectoral value chain

[Disease-resistant rootstock breeding] ──> [Synchronized scion/rootstock seedling growth] ──> [Robotic cutting & clip assembly]
                                                                                                            │
                                                                                              (Machine-vision stem-thickness matching)
                                                                                                            │
        [B2B sale of elite grafted seedlings] <──── [Hardening off in greenhouse] <─── [Healing-chamber conditioning]

Value chain levels

Cross-cutting technologies of the sector:

• Grafting machine vision: AI algorithms that analyze stem thickness and cut angle in real time, precisely aligning the cambial layers of scion and rootstock stems for a strong graft union.
• Biodegradable grafting clips: specialized clips that hold the graft union in place during healing and release on their own as the stem thickens, without needing manual removal.
• ToBRFV-resistant rootstock breeding: introgressing Tm-1-based and related resistance genes from wild tomato relatives into commercial rootstock lines to block a soil- and contact-transmissible virus that bypasses conventional fungicide-based soil treatments.

02US

The United States is scaling grafted-seedling adoption in large-scale greenhouse tomato and field watermelon production, coordinated through USDA-linked research programs.

Clemson’s Carolina Strongback rootstock program, USDA vegetable-grafting consortium, Southwest drought-resistant rootstock research

• Clemson University: its Edisto Research and Education Center runs the Carolina Strongback grafted-rootstock program, evaluating grafted watermelon nursery plants for fusarium wilt control as part of ongoing USDA-coordinated vegetable-grafting research.
• USDA-coordinated consortium: a USDA-linked vegetable-grafting research consortium coordinates rootstock research nationally, with a research emphasis on rootstocks tolerant of water scarcity in the Southwest (California, Arizona) and rootstocks that improve mineral uptake on depleted soils.
• Commercial nursery scale-up: large US greenhouse operators purchase millions of grafted seedlings annually from specialized industrial nurseries, a scale-up driven directly by the loss of methyl bromide as a soil fumigant.

03CN

China is the world’s largest producer of grafted vegetables by volume, with government-subsidized robotic nurseries concentrated in its major vegetable-growing provinces.

Shandong’s Shouguang vegetable-technology hub, robotic mega-nursery adoption, government subsidies for smallholder cooperatives

• Shouguang vegetable-technology hub: Shandong Province’s Shouguang region, one of China’s largest vegetable-growing centers, hosted the 27th China (Shouguang) International Vegetable Science and Technology Expo in April-May 2026, featuring more than 50 types of agricultural robots including automated seedling and spraying systems.
• Robotic mega-nurseries: Chinese greenhouse operators in Shandong graft vegetable seedlings at scale, with more than 90% of watermelons and cucumbers nationally grown on grafted rootstock (pumpkin or bottle gourd rootstock for watermelon), though no single China-based grafting-robot manufacturer at a scale comparable to the European suppliers profiled here could be independently confirmed via a live 2026 source.
• Government subsidies: state subsidies for grafted-seedling purchases by smallholder cooperatives reduce the risk of crop loss from viral disease, supporting continued scale-up of grafted-vegetable cultivation nationally.

04EU

The European Union hosts the world’s most automated and disease-resistance-focused vegetable-grafting seed and seedling industry, anchored in the Netherlands and Spain.

Rijk Zwaan’s ToBRFV-resistant tomato rootstocks, Syngenta’s Spanish rootstock market growth, Smart Sowing’s automated grafting machines

• Rijk Zwaan: breeds tomato rootstocks carrying Tm-1-based resistance to tomato brown rugose fruit virus (ToBRFV) and in April 2026 showcased high-resistance tomato varieties engineered to hold yield and fruit quality on par with non-resistant lines.
• Syngenta: doubled its market share of ToBRFV-resistant rootstocks in southeastern Spain by June 2026, with several million rootstocks planted across the Almería, Murcia and Costa de Granada growing regions.
• Smart Sowing Systems: makes the SGM automatic grafting machine, which gained attention in Japan in 2026 after robotics distributor Iwatani selected it for an end customer and a regional trade forum featured it among the leading automatic grafters on the market.

05Leading companies and research institutes

06Tech stack and innovations

The vegetable-grafting stack pairs disease-resistance breeding with robotic precision assembly and controlled-environment healing:

1. Grafting machine vision:
   • AI algorithms analyze stem thickness and cut angle in real time using 3D optical sensors, precisely aligning the cambial (vascular) layers of scion and rootstock stems to maximize graft-union survival rate.
2. Biodegradable grafting clips:
   • Specialized silicone or biodegradable clips hold the graft union in place during the healing period and release on their own as the stem thickens, avoiding the labor cost of manual clip removal.
3. ToBRFV-resistant rootstock genetics:
   • Introgressing Tm-1-based and related resistance genes from wild tomato relatives (Solanum habrochaites) into commercial rootstock lines blocks a highly contagious soil- and contact-transmissible virus that bypasses conventional fungicide-based soil treatments.

07Value chains and production pipelines

Industrial pipeline for robotic grafting of vegetable seedlings

┌───────────────────────────┐      ┌───────────────────────────┐
│ 1. Synchronized sowing of  │ ───> │ 2. Automated 3D-camera     │
│    scion & rootstock seed      │      │    stem-thickness screening    │
└───────────────────────────┘      └───────────────────────────┘
                                                 │
                                                 ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 4. Healing-chamber          │ <─── │ 3. Robotic angled cutting  │
│    exposure (95% humidity)     │      │    & clip fixation             │
└───────────────────────────┘      └───────────────────────────┘
              │
              ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 5. Hardening off in        │ ───> │ 6. Shipment to B2B          │
│    greenhouse                   │      │    greenhouse customers        │
└───────────────────────────┘      └───────────────────────────┘

Stage 1: Synchronized sowing of scion and rootstock seed

Scion (cultivar) and rootstock seed are sown into trays with sowing times calculated to within hours of each other, so that stem diameters match precisely by the time seedlings reach grafting age.

Stage 2: Automated 3D-camera stem-thickness screening

Seedling trays pass through a scanning conveyor where an optical 3D machine-vision system selects only seedling pairs with matching stem thickness, discarding mismatched pairs before grafting.

Stage 3: Robotic angled cutting and clip fixation

A robotic arm removes the rootstock’s growing tip and cuts the scion’s lower stem at a 30-45 degree angle using high-purity ceramic blades, then aligns the two cut surfaces so the cambial layers make contact and immediately secures the union with an elastic silicone clip.

Stage 4: Healing-chamber exposure (95% humidity)

Grafted seedlings move immediately into enclosed healing chambers; for the first 48 hours they are held in complete darkness at 95-98% relative humidity and 23-25°C to maximize graft-union fusion.

Stage 5: Hardening off in greenhouse

From around day 5, humidity is gradually reduced and gentle supplemental LED lighting is introduced; by day 7 seedlings return to a standard greenhouse environment to acclimate before shipment.

Stage 6: Shipment to B2B greenhouse customers

Hardened, fully grafted seedlings are packed and shipped to commercial greenhouse and field-growing customers, typically arriving ready for immediate transplant.