Field Trial of Agrarius™ for Cabbage in Ontario, Canada

The Problem

Napa cabbage is a high-value vegetable that's punishingly sensitive to summer heat. Hot weather triggers bolting — the plant flowers prematurely, head quality crashes, and saleable yield drops with it. Limp, withered heads also reduce post-harvest shelf life, which compounds the loss at the packhouse.

Growers needed an input that supports plant health and tighter heads through the heat window — without changing the rest of the operation.

The Trial

A side-by-side Napa cabbage trial in Ontario, Canada compared two foliar Agrarius applications against an untreated control bed under the same conditions. Two 100-foot beds, two rows of cabbage each.

• Location: Ontario, Canada
• Crop: Napa cabbage
• Trial setup: two 100-foot beds, each with two rows
• Protocol: 2 foliar Agrarius applications during the growing cycle
• Comparison: treated bed vs. untreated control bed
• Sample: 4 randomly selected heads — 2 from each group

The Results

Treated heads were greener, firmer, heavier, and didn't bolt.

• No bolting: the Agrarius-treated group showed no signs of bolting through hot weather. The control bed bolted in many heads.
• Per-head weight: +105% — treated heads more than doubled the weight of control heads at evaluation.
• Head firmness: firmer, denser heads — better post-harvest storage life when chilled.
• Overall yield: +20% at the field level, on top of the per-head quality gains.
• Visual health: greener canopies, more leaves per plant, faster crop growth.

The treated heads weren't just bigger numbers — they were better cabbages.

Why This Matters

For a vegetable that lives or dies on hot-weather quality, eliminating bolting is the headline benefit. Heavier, firmer heads compound it.

• Saleable yield: more product reaching market grade.
• Pack-out: firmer heads chill and store better — fewer post-harvest losses.
• Buyer-grade quality: deeper green color, more uniform appearance.
• Risk reduction: the program took the worst-case "lost crop to bolting" scenario off the table in this trial.

For a fragile high-value crop, predictability is half the value.

How To Use It

Two foliar applications fit normal Napa cabbage management.

• Apply foliarly: during the growing cycle, on the existing spray calendar.
• Frequency: 2 applications per cycle.
• Equipment: standard foliar sprayer.
• Tank-safe: compatible with existing nutrient and crop-protection programs.
• Pairing: layer onto current management — particularly valuable through hot-weather windows where bolting risk is highest.