Green Planet Plant Guard (1L / 5L)

What is Green Planet Plant Guard and what does it do?

Green Planet Plant Guard is a potassium silicate additive that strengthens plant cell walls, helping plants build tougher stems and better handle environmental stress, heat, drought, and physical strain. It’s commonly used to support heavier flowers, reduce floppiness, and improve resilience in both veg and flower stages.

When should I start using Green Planet Plant Guard?

Start using Plant Guard early in veg and continue through flowering. Stop 1–2 weeks before harvest. Signs you may need it include stretchy stems, weak branches, or stress from heat, heavy yield, or poor structural growth.

How much Green Planet Plant Guard should I use?

The standard dose is 0.5 mL per litre of water, used every feed. That’s 5 mL per 10L or 50 mL per 100L. Stick to the recommended dose and avoid overfeeding to prevent sediment, pH drift, or nutrient issues.

Can I use Green Planet Plant Guard in soil, coco, and hydro?

Yes—Plant Guard works across all growing media including soil, coco coir, hydroponics, DWC, RDWC, and autopots. Just mix carefully and keep systems clean to prevent buildup or clogging in lines or reservoirs.

Does Green Planet Plant Guard affect pH or EC?

It can slightly nudge both pH and EC. Always dilute it separately in water before adding to your tank, mix thoroughly, then check and adjust pH after everything is added. Don’t skip this step if you’re running tight margins.

Why do I need to mix Green Planet Plant Guard separately?

Silicates can react with other concentrates and cause cloudiness or sediment if mixed directly. Always dilute Plant Guard in water first, then add it to your solution. This prevents clogging and helps maintain nutrient availability.

Can I use Green Planet Plant Guard with other nutrients and additives?

Yes—Plant Guard is generally compatible with most nutrient brands, microbes, and enzymes. Just avoid mixing multiple silica products or combining with calcium in concentrate form, as this can cause precipitation or nutrient lockout.

Can I use Green Planet Plant Guard as a foliar spray?

It’s primarily designed for root-zone use, but some growers use it as a light foliar. If so, test a small area first—silicates can cause spotting or burn if used too strong or sprayed under intense light.

Is Green Planet Plant Guard safe for edible crops?

Yes—silica additives like Plant Guard are widely used in edible horticulture. Just follow the recommended dose and stop use at least two weeks before harvest to avoid any potential residue issues.

Can I use Green Planet Plant Guard with RO or hard water?

Yes. RO water is fine, but make sure your mix includes proper Cal-Mag support. Hard water can increase the chance of sediment if mixing is sloppy—dilute properly and watch for cloudiness when adding to the tank.

What are signs I’m overusing Green Planet Plant Guard?

Cloudy nutrient mix, sediment in tanks, rising EC, strange pH behavior, or signs of nutrient imbalance may indicate overuse. Stick to 0.5 mL/L and always mix correctly to avoid these issues.

Can Green Planet Plant Guard fix nutrient deficiencies?

No—Plant Guard supports structure and stress resistance but doesn’t supply core nutrients. If you’re seeing deficiencies, address your base nutrition program first before layering in structural additives.

Can I use Green Planet Plant Guard in living soil?

You can, but go easy. Living soil growers often prefer minimal inputs. If you choose to use Plant Guard, apply at low doses and monitor plant response—overfeeding can disrupt soil biology.

How should I store Green Planet Plant Guard?

Store it in a cool, stable place out of direct sunlight. Shake well before each use to ensure the silicate is evenly distributed. Avoid storing in a hot shed or mixing large batches far in advance.

What size Green Planet Plant Guard should I buy?

1L is ideal for small grows or testing. 5L is better value if you're running regular feeding cycles across multiple grows. It's a consistent-use product, so larger sizes reduce reorders and cost per feed.