Fertiliser Calculator
Growing Method
Top dress 3 g/L · Cal-Mag 0.75 g/L — suits most growers
Grams and ml are interchangeable for dry amendments — 1 g ≈ 1 ml.
Mixing Veg into substrate before planting
Mixing Mineral Mix into substrate before planting
All feeding stops 4 weeks before harvest — plain dechlorinated water only
Vegetative Phase — Veg 4-4-4
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Include a 50:50 transition feed
One top dress of equal parts Veg and Bloom when switching to flower
One top dress of equal parts Veg and Bloom when switching to flower
Flowering Phase — Bloom
Supplements
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Cal-Mag (recommended)
0.5–1g per litre of water as a root drench every 2 weeks
0.5–1g per litre of water as a root drench every 2 weeks
Weekly in coco, every 2 weeks in soil. Can be top dressed dry or dissolved in water as a root drench — same amount either way.
What You Need
Includes a 10% buffer so you don't run short. Actual usage varies with plant size, temperature, and substrate.
Application rates based on Dr Forest Veg & Bloom recommended dosages.
For individual product rates see each product page.
For individual product rates see each product page.