Contact Us

The Lyman Group, Inc.
201 East Street
Woodland, CA 95776

Tel: (530) 662-5442
Fax: (530) 662-1209

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The Harvey Lyman Company

  • They rely on the in-field observations, knowledge and recommendations of our PCAs, CCAs and consultants.
  • They count on the immediate availability of crop input, and protection products, related traditional and organic products that help them grow healthy, profitable crops.
  • They have confidence in our set up people who calibrate grower fertilizer and spray application equipment for maximum effectiveness and efficiency.
  • They know they we have the reliable office and warehouse staff always prepared to meet their needs.
  • In these complex times, a good day also means we’ve helped growers successfully navigate through the maze of local, regional and national regulations, requirements and restriction that impact everyday farm operations.
  • We work as a team throughout our divisions and with our partner organization, The Tremont Group, Inc. to earn the trust of growers as part of their team for their farming success.

  • Experienced, highly knowledgeable staff of Certified Crop Advisors (CCAs), Licensed Pest Control Advisors (PCAs) and Consultants
  • Qualified Applicators for Fertilizers & Crop Protection Products
  • Custom Application of Fertilizers & Crop Protection Products
  • Custom blended dry and liquid fertilizer to specific croup and soil needs.
  • Dedicated, friendly employees with professional integrity and grower loyalty
  • Deliveries of crop input products timed to meet grower operations needs
  • Field equipment set up and calibration
  • Field Records Management
  • Hydrology consulting services and product lines
  • Office and warehouse support staff
  • Organic crop production recommendations and product lines
  • Precision Farming through Global Positioning Systems (GPS)
  • Progressive soil/tissue nutrition management
  • Prompt, ranch delivery of crop input and protection and related products
  • Soil Tissue and Water Sampling
  • Sustainable wine grape farming systems

  • IPM Consulting, specializing in wine grapes and pear production.
  • Viticultural Consulting, including site evaluation, rootstock and variety recommendations.
  • Pomological consulting
  • Plant tissue and soil analysis, and fertility recommendations
  • Water Analysis
  • Plant disease and pest detection and forecasting
  • Cover crop recommendations
  • Conventional, sustainable and organic crop protection products and techniques
  • Conventional and organic fertilizers and foliar nutrients
  • Liquid fertilizers and custom fertilizer blends
  • Conventional and organic soil amendments
  • Cover crop seed and custom seed blends tailored to your individual site
  • Grapevines
  • We specialize in CCOF and OMRI (Organic Materials Review Institute) approved crop inputs.



Greg McCosker, PCA

Office: 916 776-1744
Cell: 916 439-2302
Fax: 916 776-1031

“All of our employees take tremendous pride in helping our growers be successful. We are part of a team they rely on for maximizing their crop yields, and we take that responsibility very seriously.”


Primary Crops

Alfalfa, almonds, apples, asparagus, blueberries, cantaloupes, cherries, cotton, cucumbers, field corn, forage grains, garlic, oats, peaches, pears, prunes, rice, safflower, seed onions, squash, safflower, sunflowers, tomatoes, vine seed, walnuts, watermelons, wheat, wine grapes.

Environmental Stewardship

Environmental stewardship is a way of life and natural approach to how we do business.


We are not in business simply to be profitable, but to improve the quality of life for the environment and the communities where we live and work.

Community Support

We are an active, friendly and supportive part of the communities we serve.


We support many organizations such as Future Farmers of America (FFA), 4-H, Young Farmers & Ranchers, Little League, California Farm Bureau and local Chamber of Commerce’s

Our PCAs and CCAs


Bob Castanho

Office: 916 776-1744
Cell: 916 439-2019
Fax: 916 776-1031


Doug Grupe

Office: 916 776-1744
Cell: 916 439-2209
Fax: 916 776-1031


Charlie Hamilton

Office: 916 776-1744
916 752-8657
Fax: 916 776-1031


Mike Huffman

Office: 916 776-1744
Cell: 916 439-2238
Fax: 916 776-1031

Darren Lubich

Darren Lubich

Office: 916 776-1744
Cell: 916 752-8645
Fax: 916 776-1031

Kevin McCosker

Kevin McCosker

Office: 916 776-1744
Cell: 916 439-4360
Fax: 916 776-1031

James Johas

James Johas

Office: 916 776-1744
Cell: 916 439-2634
Fax: 916 776-1031


Don Salfen

Office: 916 776-1744
Cell: 916 439-2022
Fax: 916 776-1031

Thom Wiseman

Thom Wiseman

Office: 916 776-1744
Cell: 916 439-3042
Fax: 916 776-1031


Karl Yuki

Office: 916 776-1744
Cell: 916 439-3157
Fax: 916 776-1031

Brett Schmitz

Brett Schmitz

Office: 916 776-1744
Cell: 209 747-6818
Fax: 916 776-1031

Walnut Grove, CA

14301 Railroad Ave.
PO Box 279
Walnut Grove, CA 95690

Office: (916) 776-1744
FAX: (916) 776-1031