Paso Robles, California

The Science of Soil.
The Art of Farming.

I don't guess at what land can do. I read it, measure it, and tell you the truth.

C.P.S.S. | Certified Professional Soil Scientist
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I became a soil scientist because I believe the land tells you what it wants to grow. For 30 years I've helped landowners listen.

— Steve Vierra, C.P.S.S.
Steve Vierra conducting soil analysis in the field, Paso Robles CA
Steve Vierra examining soil profile in the field

About Steve Vierra

Three Decades
in the Field

Steve Vierra's story began in the vineyards of Paso Robles. While still a student at Cal Poly San Luis Obispo, he launched his first soil research project in 1997 at Laura's Vineyard in East Paso Robles — and Steve Vierra Agriculture was born. After graduating in 1999 with a degree in Soil Science, Steve earned his certification as a Certified Professional Soil Scientist (C.P.S.S.) and went on to design and install some of the region's most respected vineyards.

What started as a young scientist's curiosity about the relationship between soil and plant has grown into a career spanning three decades and four continents. Steve's vineyard experience includes work in New Zealand, Chile, and Australia — bringing a global perspective to every California project he takes on.

Back home on the Central Coast, Steve has spent over two decades in senior operational roles — first as a resident soil scientist and vineyard manager for a prominent Paso Robles viticulture firm, then as Director of Vineyard Operations overseeing hundreds of acres of wine grape production across multiple properties. Along the way he pioneered mechanized farming practices that helped reshape how Central Coast growers think about efficiency and quality.

In recent years, Steve has emerged as the leading local expert in spirit-quality agave cultivation, helping wine grape growers explore viable alternative crops suited to California's evolving climate and water landscape. It's a natural extension of his core philosophy: read the soil, understand the land, and grow what belongs there.

Work With Me
1997
Founded

First soil research project at Laura's Vineyard, East Paso Robles. Steve Vierra Agriculture established.

1999
Cal Poly SLO — Soil Science

Graduated with a degree in Soil Science. Earned Certified Professional Soil Scientist (C.P.S.S.) designation.

Intl.
International Expansion

Vineyard consulting across New Zealand, Chile, and Australia — building a global soil and viticulture perspective.

Ops
Director of Vineyard Operations

Senior operational roles across Paso Robles — resident soil scientist, vineyard manager, then Director overseeing hundreds of acres. Pioneered mechanized farming on the Central Coast.

2015+
Agave Consulting

Emerged as Central Coast's leading expert in spirit-quality agave — a natural fit for California's arid landscape and evolving water constraints.

Today
Full-Service Agronomic Consulting

Soil analysis, land evaluation, crop planning, farm management, and plant material sourcing — for wine grapes, agave, and beyond.

30 Years of Viticulture

Vineyards Across
the World's Great Regions

Three decades of vineyard consulting has taken me from the Central Coast of California to the valleys of Chile, the cool-climate terroir of New Zealand, and the diverse growing regions of Australia. Every region teaches something new — and that accumulated knowledge comes to bear on every project.

California

Paso Robles · Central Coast · Home Base

The heartland of my practice. Thirty years working California's diverse AVAs — from the fog-cooled valleys of the Coast to the warm, calcareous soils of Paso Robles — have shaped every dimension of my consulting approach. Paso Robles' extreme diurnal swings, limestone-rich Calcareous soils, and water scarcity make it a perfect crucible for arid viticulture expertise.

  • Paso Robles AVA development & site planning
  • Calcareous & clay-loam soil management
  • Dry-farmed and deficit-irrigated vineyard systems
  • Variety & clone selection across the Central Coast

New Zealand

Marlborough · Hawke's Bay · Central Otago

New Zealand's dramatic range of terroir — from Marlborough's stony riverbeds to the schist soils of Central Otago — demands a fundamentally different lens than California. Consulting here refined my understanding of cool-climate viticulture, high-acid varieties, and the interplay between volcanic and alluvial soil profiles in shaping wine character.

  • Cool-climate Sauvignon Blanc & Pinot Noir systems
  • Stony riverbed & schist soil assessment
  • High-UV, high-diurnal range management
  • Sustainable & certified organic programs

Chile

Maipo Valley · Colchagua · Casablanca

Chile's long, narrow geography produces remarkable climatic diversity within a single country — the cool Pacific influence of Casablanca alongside the warm, clay-rich soils of Colchagua. My work here encompassed large-scale estate planning, irrigation infrastructure in water-constrained valleys, and the introduction of alternative varieties suited to Chile's unique soil-climate combinations.

  • Large-scale estate development & layout
  • Drip irrigation design in arid valleys
  • Clay & granitic soil profiling
  • Cabernet, Carménère & alternative variety programs

Australia

Barossa Valley · McLaren Vale · Margaret River

Australia's wine regions span an extraordinary range of climates and soil types — from the warm, ironstone-rich soils of the Barossa Valley to the maritime-influenced granites of Margaret River. Consulting here broadened my perspective on old-vine systems, heat management in arid Mediterranean climates, and the parallels between Australian and Californian terroir challenges.

  • Old-vine Shiraz & Grenache management
  • Ironstone, clay & granite soil profiling
  • Heat management in Mediterranean arid climates
  • Varietal adaptation & water-efficient vine systems

Vineyard Services

Full-Spectrum Viticulture Consulting

New Vineyard Development

From raw land to first harvest — site assessment, variety and rootstock selection, layout and trellising design, and planting.

Soil Science & Site Suitability

In-depth soil characterization, classification, and fertility analysis to match varieties and practices to your specific terroir.

Water Management

Irrigation system design, deficit irrigation strategy, and dry-farming feasibility across arid and semi-arid climates.

Canopy & Crop Management

Annual management programs for canopy architecture, crop load, cover crops, and soil health to consistently optimize fruit quality.

Replant & Rehabilitation

Assessment and strategic planning for underperforming or aging vineyards — disease management, replanting, and variety transition.

International & Cross-Region Benchmarking

Drawing on experience across four countries — California, New Zealand, Chile, and Australia — to identify best practices and apply lessons from the world's most demanding terroirs.

Munsell soil color chart and rock hammer in the field

Core Services

Where Science Meets
Agricultural Practice

From raw land evaluation to long-term crop management, every engagement is shaped by rigorous soil science and real-world agricultural judgment.

Site Analysis & Evaluation

Comprehensive land assessment combining soil profiling, topographic analysis, water availability, and micro-climate evaluation to determine agricultural potential and suitability.

Soil Science & Health

Certified Professional Soil Scientist (C.P.S.S.) services including soil characterization, classification, fertility analysis, and remediation strategies tailored to arid and semi-arid conditions.

Vineyard Consulting

30 years of vineyard experience across four countries. Variety selection, rootstock matching, canopy management, irrigation design, and long-term viticulture strategy — from Paso Robles to the Barossa.

Arid Systems Consulting

Specialized expertise in low-water, high-efficiency agricultural systems. Water-use strategy, drought-adapted variety selection, and land management for California's challenging dry climates.

Agave Systems

Over a decade consulting on agave cultivation for spirits production, fiber, and ecosystem services. Site suitability, variety selection, cultural practices, and harvest planning.

Crop Management

Ongoing management programs integrating soil health monitoring, fertility scheduling, pest and disease strategy, and adaptive practices to optimize production over the long term.

Featured Focus

A Decade in
Agave

Few crops demand as much patience — or reward it as richly — as agave. Over the past 10 years, I have developed a deep, specialized practice in agave cultivation across California and the arid West.

From selecting the right species for your climate and soil, to designing planting layouts and long-term harvest plans, my work covers the full arc of an agave operation. Agave's low water requirements and emerging market for spirits production make it one of the most compelling crops for California's drier regions.

  • Site suitability & soil assessment
  • Species & variety selection
  • Planting design & density planning
  • Water & nutrient management
  • Harvest timing & yield strategy
  • Distillery & production partnerships
Inquire About Agave

Good agriculture starts with understanding the ground beneath your feet. Everything else follows from there.

— Steve Vierra, C.P.S.S.
10+ Years Agave Experience
Arid Climate Specialist
Steve Vierra in agave field

How We Work

From First Call
to Long-Term Partnership

01

Initial Consultation

We begin with a conversation about your land, your goals, and your challenges. No obligation — just an honest exchange about what's possible.

02

Site Assessment

On-site soil evaluation, topographic analysis, water resource review, and climate characterization to build a complete picture of your land's potential.

03

Strategic Planning

A clear, science-backed plan tailored to your operation — crop selection, water management, soil health strategy, and a realistic timeline.

04

Implementation & Management

Hands-on guidance through planting, establishment, and ongoing crop management — with regular monitoring and adaptive refinement over time.

Good agriculture starts with understanding the ground beneath your feet. Everything else follows from there.

— Steve Vierra, C.P.S.S.

Credentials & Background

  • Certified Professional Soil Scientist (C.P.S.S.)
  • 30+ Years Agricultural Experience
  • Vineyard Consulting — California, New Zealand, Chile & Australia
  • 10+ Years Agave Consulting
  • Arid & Semi-Arid Systems Expert
  • Based in Paso Robles, California · Est. 1997

Get in Touch

Let's Talk
About Your Land

Whether you're evaluating a new property, developing an existing operation, or exploring agave as a crop — I'd welcome the conversation. Based in Paso Robles and consulting throughout California, the arid West, and internationally.

Location Paso Robles, California
Phone 805-391-3865
Website stevevierraag.com
Specialty Arid Agriculture, Vineyards & Soil Science