Green Planet GP3 Grow (1L / 5L)

What is Green Planet GP3 Grow and what does it do?

GP3 Grow is the vegetative-phase component of Green Planet’s 3-part base nutrient system. With an NPK of 2-1-6, it’s rich in potassium and nitrogen to drive leafy growth, plant structure, and early transition into flower. It also includes magnesium for photosynthesis support.

When should I use Green Planet GP3 Grow?

Use GP3 Grow throughout the vegetative stage and into early flowering. Most feeding programs taper it down mid-bloom and remove it entirely in late flower. In hydro and coco, it's typically used every feed; in soil, apply less frequently.

How much Green Planet GP3 Grow should I use?

Doses vary by stage, ranging from 0.25 mL/L in early veg to around 1.25 mL/L as growth ramps up. To scale, multiply the dose by your tank size—for example, 1.25 mL/L equals 12.5 mL in 10L.

Can I use GP3 Grow in hydroponics, coco, soil, or autopots?

Yes—GP3 Grow is compatible with all major grow media. In coco and hydro, ensure proper runoff to avoid salt buildup. In soil, feed at lower strength. For hard or RO water, adjust supporting nutrients as needed.

What’s the correct order to mix GP3 nutrients and additives?

Always mix GP3 Micro first, then GP3 Grow, then GP3 Bloom—mixing thoroughly between each. Add silica first if using it. Never mix concentrates together undiluted. Dose separately in automated systems to avoid precipitation issues.

Does GP3 Grow affect EC or pH levels?

Yes—GP3 Grow raises EC like any base nutrient. Always check EC when stacking other products. Mix all nutrients before adjusting pH. Most growers aim for pH in the high 5s to mid 6s (hydro/coco) or slightly higher in soil.

What are signs of overfeeding or underfeeding GP3 Grow?

Underfeeding shows as pale growth, thin stems, and slow veg. Overfeeding may cause dark leaves, clawing, or tip burn. Flushing isn’t required by default but helps if EC has been pushed too high or salt buildup occurs.

Can GP3 Grow fix yellowing leaves?

Only if yellowing is due to nutrient deficiency during veg. If the issue is pH lockout, poor roots, or overwatering, GP3 Grow won’t fix it alone—those environmental factors must be addressed first.

Is Green Planet GP3 Grow safe for edible plants like tomatoes?

Yes—GP3 Grow is a mineral-based nutrient system used on various edible crops. Use proper rates and monitor EC to avoid overfeeding. It's also compatible with beneficial microbes if EC and oxygen levels are managed.

How should I handle and store Green Planet GP3 Grow?

Shake well before use. Store upright in a cool, dry place, out of direct sunlight. Avoid freezing or overheating. GP3 Grow is fully water soluble and does not contain synthetic dyes—color isn't a dose indicator.

Is Green Planet GP3 Grow beginner-friendly?

Yes—GP3 is popular for its flexibility and clear feed programs. For best results, follow the official feed chart, mix in order, track EC and pH, and increase strength only when plants show they’re ready.