A trellis net is one of the simplest yet most effective tools you can use to dramatically improve plant structure, canopy uniformity, and overall yields. Whether you’re growing cannabis in a tent, room, or greenhouse, a trellis net helps guide branches outward instead of upward—maximizing light exposure and supporting heavy flowers later in the grow.
Trellis nets are widely available at local garden centers, online grow shops, and are often included in grow tent kits designed specifically for indoor cannabis cultivation.
What Is a Trellis Net?
A trellis net is typically a grid made from nylon, plastic, or elastic cord that stretches horizontally above your plants. The grid spacing is usually between 3.5”–6” squares, allowing you to gently guide branches into open spaces as the plant grows.
Its primary purposes are:
Even canopy distribution
Structural support
Improved light penetration
Better airflow
In cannabis cultivation, trellis nets are most commonly associated with SCROG (Screen of Green) growing methods, but they’re useful far beyond that single technique.
Why Trellis Nets Matter for Cannabis Grows
1. Even Canopy = Better Light Efficiency
Cannabis lights work best when the canopy is flat and uniform. A trellis net allows you to spread branches outward so that:
Light hits more bud sites
Lower growth isn’t shaded out
Energy is distributed evenly across the plant
This is especially important for LED grow lights, where optimal distance from the canopy directly affects yield and terpene production.
2. Stronger Branch Support During Flower
As plants transition into flower, buds gain weight quickly. Without support, branches can:
Bend excessively
Snap under pressure
Lean into neighboring plants
A trellis net acts like a safety net, keeping colas upright and properly spaced.
3. Improved Airflow and Disease Prevention
By spreading branches apart:
Air moves more freely through the canopy
Humidity pockets are reduced
Risk of mold, mildew, and bud rot is lowered
This is particularly valuable in dense indoor grows or high-humidity environments.
How to Use a Trellis Net (Step-by-Step)
Step 1: Install at the Right Height
Vegetative stage: Install the trellis 8–12 inches above the pots
Flower support (second net): Optional second net 6–10 inches above the first
Mount the net securely to tent poles or wall anchors so it stays taut.
Step 2: Start Training Early
As branches grow through the net:
Gently pull each branch sideways into the next open square
Avoid forcing or sharply bending stems
Train gradually over multiple days
This technique encourages lateral growth and creates a wide, flat canopy.
Step 3: Continue Adjusting Until Flower Stretch Ends
Most growers stop active training:
1–2 weeks into flower
After the main stretch phase finishes
After that point, the trellis becomes primarily structural support.
Common Trellis Net Myths (and the Truth)
❌ Myth 1: Trellis Nets Are Only for Advanced Growers
Truth: Trellis nets are beginner-friendly. If you can gently move a branch, you can use a trellis.
❌ Myth 2: Trellising Will Stress or Damage Plants
Truth: When done gradually, trellising is low-stress and often results in stronger, healthier plants.
❌ Myth 3: You Must Use SCROG to Use a Trellis
Truth: Trellis nets work great for:
Sea of Green (SOG)
Multi-plant grows
Autoflowers (with gentle handling)
Flower-only support
❌ Myth 4: One Net Is Always Enough
Truth: Many growers use two trellis nets—one for training and one for flower support—for optimal results.
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