Welcome to the Nutrients & Fertilizers forum.

This section is for cannabis feeding, fertilizers, nutrient lines, dry salts, organics, living soil, hydroponic nutrient management, pH/EC/PPM, additives, deficiencies, toxicities, and nutrient-related troubleshooting.

Before starting a new thread, please read this post and include the basic information below. It helps members give useful answers instead of guessing.

Before you post a nutrient problem, include this:

• Grow medium: soil, coco, rockwool, DWC, RDWC, aeroponic, living soil, amended mix, etc.
• Plant stage: seedling, veg, transition, flower week, autoflower/photo.
• Nutrients used: brand/product names, exact dose, how often, and whether you are following the bottle schedule.
• Water source: tap, RO, well, filtered, softened, rainwater.
• pH: input pH and runoff/reservoir pH if available.
• EC/PPM: input and runoff/reservoir readings. Tell us which PPM scale if you know it.
• Container/reservoir details: pot size, reservoir size, watering frequency, runoff percentage, changeout schedule.
• Environment: light type/wattage, distance, temperature, RH, airflow, CO2 if used.
• Photos: whole plant, affected leaves, new growth, lower growth, and container/root-zone if relevant.
• Recent changes: transplant, flip to flower, new bottle, pH adjustment, flush, top dress, foliar spray, pest treatment, heat/cold event.

Do not diagnose from one leaf only. Many nutrient problems look like watering, pH, root-zone, pest, light, heat, or humidity problems. Give the full picture.

Start with these THCFarmer Learn guides:

• Fertilizers & Nutrients Learn Center
• Nutrient Disorder Problem Solver
• TDS, PPM, and EC
• Basic Elements and Nutrient Balance
• How to Figure Out the PPM of a Fertilizer Mix
• pH Adjustment in Organic Solutions

Legacy forum threads worth reading:

Budget salts / simple programs

• Ballin’ On a Budget – THE RECIPE
• Cheap Alternatives to Overpriced Hydroponic Nutrients

DIY mixing / fertilizer math

• Fatman’s DIY Nutrient Mixing Guide

Silicon / silica

• Plant Available Silicon / Soluble Silicon Sources

Organics, KNF, teas, and biological inputs

• Korean Natural Farming / Master Cho
• Vortex Tea Brewer Build Discussion

Safety, residues, PGRs, and questionable products

• 180 Day Lab Test of Avid, Forbid, Floramite, Eagle 20
• Phosphoload, Gravity, Bushmaster, Topload, and Flower Dragon Are TOXIC

Posting rules for this section:

• Do not spam nutrient brands, affiliate links, discount codes, or advertisements.
• Disclose any relationship with a company, shop, brand, lab, or product.
• Do not ask to buy, sell, trade, or source seeds, clones, pollen, cannabis, concentrates, or controlled substances in this forum.
• Keep brand debates civil. Post your medium, numbers, method, and results.
• When giving advice, explain the reasoning. “Add Cal-Mag” is not a diagnosis.
• If a product is unsafe, banned, mislabeled, or lab-tested, post evidence where possible.

Best thread title format:

[Medium] [Stage] [Main problem] – pH/EC included

Examples:

• Coco flower week 3 – burnt tips and high runoff EC
• DWC veg – pH dropping daily, roots look tan
• Living soil – yellow lowers after top dress
• Autoflower in soil – dark clawing leaves, possible nitrogen toxicity

Reminder: Nutrient advice is context-dependent. What works in coco may not work in living soil. What works in RO water may not work in hard tap water. What works under high light may burn a plant under low light. Post the numbers and photos first.