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.

Vineyard consultant · Agave farming specialist · Certified Soil Scientist — San Luis Obispo County, CA

My Story Start a Conversation
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 · Awatere Valley · Wairau Valley

My New Zealand work was rooted in Marlborough — the country's premier wine region and one of the world's most distinctive Sauvignon Blanc appellations. Working across the Wairau Valley's classic stony riverbeds and the cooler, windswept soils of the Awatere Valley sharpened my understanding of how subtle shifts in soil depth, drainage, and diurnal range translate directly into wine character.

  • Wairau & Awatere Valley site assessment
  • Stony riverbed & alluvial soil profiling
  • Sauvignon Blanc variety & clone selection
  • Cool-climate irrigation & canopy management

Chile

Maule Valley · Itata Valley · Curicó Valley

My work in Chile was concentrated in the south-central growing regions — Curicó, Maule, and Itata — where granitic and volcanic soils, dry summers, and old-vine traditions create some of the country's most compelling terroir. These valleys deepened my experience with dryland farming, water-limited viticulture, and the agronomic potential of underrecognized regions.

  • Maule, Itata & Curicó Valley site assessment
  • Granitic & volcanic soil profiling
  • Dryland & deficit-irrigated vine systems
  • Old-vine variety evaluation & management

Australia

South Australia · New South Wales

My Australian work was conducted through Soilworks, focused on soil amelioration for vineyards and orchards across South Australia's premier growing regions. This engagement sharpened my applied soil science practice — diagnosing compaction, acidity, and structural limitations, then designing targeted remediation programs to improve productivity and long-term soil health.

  • Soil amelioration for vineyards & orchards
  • Compaction, acidity & drainage remediation
  • Soil health diagnostics & treatment planning
  • South Australian wine & horticultural regions

Vineyard Services

Full-Spectrum Viticulture Consulting

◆
Vineyard Development & Management

From raw land to first harvest, or stepping in as management on an established operation — site assessment, variety and rootstock selection, layout and trellising design, crew coordination, and ongoing farm oversight.

◆
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 & Land Evaluation

Comprehensive land assessment combining soil profiling, topographic analysis, water availability, and micro-climate evaluation to determine agricultural potential and suitability. Includes land use classification, agricultural productivity documentation, and Williamson Act / ag preserve eligibility support for San Luis Obispo County landowners.

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, minimal establishment cost, and rapidly growing demand from California's craft spirits industry make it one of the most compelling alternative crops for landowners looking to diversify revenue, reduce water use, or transition away from wine grapes.

I work directly with vineyard owners, raw land investors, and distillery sourcing programs — helping connect growers to buyers and structure operations built for long-term yield.

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

Agave is one of California's most compelling dry-land crops — low capital to establish, minimal water demand, a natural fire break, and a direct path into one of agriculture's fastest-growing markets: California agave spirits. For vineyard owners exploring diversification, it's not just a plant. It's a long-term land strategy.

10+ Years Agave Experience
Arid Climate Specialist
Steve Vierra inspecting agave plants cultivated for California spirits production, Paso Robles

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

Frequently Asked
Questions

What does a Certified Professional Soil Scientist (C.P.S.S.) do?

A C.P.S.S. evaluates, classifies, and interprets soils for agricultural and land-use purposes. Steve applies this expertise to vineyard site selection, agave cultivation planning, soil health diagnostics, and agricultural land evaluation across California's Central Coast.

What areas does Steve Vierra Agriculture serve?

Steve is based in Paso Robles and serves clients throughout the entire state of California. He also works with landowners outside California — including projects in Arizona, Colorado, and Texas — and has international consulting experience in New Zealand, Chile, and Australia.

Does Steve work with small properties or only large operations?

Steve has consulted on projects ranging from a few acres to thousands of acres. Whether you're evaluating a small parcel for the first time or managing a large multi-property operation, the science is the same — and every landowner deserves an honest assessment of what their land can do. No project is too small to start a conversation.

What is the Williamson Act and how can an agricultural consultant help?

The Williamson Act (California Land Conservation Act) allows landowners to receive significantly reduced property tax assessments in exchange for keeping land in agricultural use. Steve provides land evaluation and agricultural productivity documentation to support Williamson Act enrollment and renewal for San Luis Obispo County landowners.

Can I grow agave for spirits production on my land?

Many regions across the American West are well suited to agave — but suitability depends heavily on your specific soil, climate, elevation, and water availability. That's exactly what Steve determines through a site evaluation: feasibility for your property, which species and varieties are the right fit, planting and density design, and long-term harvest planning. Steve has consulted on agave projects in California, Arizona, Colorado, and Texas.

Should vineyard owners consider agave as an alternative crop?

Agave is one of the most compelling diversification options for California vineyard owners facing water constraints, rising costs, or shifting markets. It requires minimal irrigation, low establishment capital, and benefits from growing demand in the California agave spirits industry. Steve specializes in evaluating agave as a viable alternative or complementary crop for existing wine grape operations.

How do I start working with Steve?

The first step is a no-obligation conversation about your land, your goals, and your challenges. Use the contact form below, call 805-391-3865, or email [email protected] to schedule an initial consultation.

Get in Touch

Let's Talk
About Your Land

Whether you're evaluating a new property, developing an existing operation, exploring agave as an alternative crop, or need agricultural land documentation for tax or Williamson Act purposes — I'd welcome the conversation. Based in Paso Robles and serving San Luis Obispo County, the Central Coast, and beyond.

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