About us

Seeds bred for your soil, your climate, your market.

We specialise in F1 hybrids demanded by commercial growers across ASEAN and beyond.

Thai roots. Regional reach.

SIAM Seed breeds vegetable varieties suited to tropical and subtropical regions — from highland cool crops to lowland heat-tolerant lines. Our catalogue focuses on cabbage, broccoli, cauliflower, choy sum, onion, melon, watermelon, pumpkin, chilli, and eggplant.

Every day we work for farmers and distributors in 45 or more countries. We are ready to share cultivation know-how — and the varieties we have developed.

  • Seeds & seedlings
  • Cabbage
  • Broccoli
  • Cauliflower
  • Chinese cabbage
  • Leafy greens
  • Onion
  • Melon
  • Watermelon
  • Pumpkin
  • Eggplant

Values

What guides our breeding

Fit to climate

Lines selected for highland cool crops and lowland heat — not one-size-fits-all.

Field partnership

We learn from growers and distributors, then breed back into the catalogue.

Responsible genetics

Better yield on existing land, with resistance that cuts chemical pressure.

Leadership

People behind SIAM

Group Managing Director

Khun Siriporn Chaiwat

Leads strategy, ASEAN partnerships, and long-term breeding investment since 2015.

Founder (1962)

Khun Somchai Rattanakul

Opened the Bangkok seed counter that grew into SIAM Seed Co., Ltd.

Former Managing Director

Khun Malee Rattanakul

Expanded F1 programmes and regional exports through the 1990s–2000s.

Our story

From a Bangkok trading desk to ASEAN fields.

Khun Somchai Rattanakul opens a seed and farm-supply counter in Bangkok.

SIAM Seed Co., Ltd. is incorporated.

Chiang Mai research station opens.

First exports to Indonesia, Thailand, and Singapore.

Dedicated F1 hybrid breeding programme launched.

Khun Siriporn Chaiwat becomes Group Managing Director.

ASEAN breeding consortium trials begin in five countries.

Thai seed for the region — new life from every field.

Work with SIAM

Explore our catalogue or email the team about distribution.

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