Post-Flask Sterilization — The Tissue Culture Protocol

When a Tissue Culture plant exits the flask, it is not a 'plant.' It is an experiment. It was raised in a completely sterile environment — an Agar gel rich in sugars and phytohormones, without bacteria, without fungi, without anything present in our air. You are now exposing it to the real world. If you don't clean it correctly, within a week you will have black mush. This is not bad luck — it is a failed protocol. The problem is the Agar. The sugar residue remaining attached to the roots is a three-course meal for mold. A single pinhead-sized remnant is sufficient to fuel a fungal colony within 48–72 hours under high humidity. And beginner growers — and not only beginners — miss such remnants because Agar is transparent. The official Pink Leaf protocol: prepare a sterilization solution at a precise 1:4 ratio — 3% H₂O₂ Hydrogen Peroxide into distilled water. 50ml H₂O₂ to 200ml distilled water. Not tap water. Not 'approximately.' Distilled. Submerge the entire plant for exactly 10 minutes. Not 5, not 15. Ten. Less than that is insufficient for sterilization; more than that burns the tender root tips — which are the most valuable asset the plant has at this moment. After soaking — and before placing on any substrate — work with a soft fine artist's paintbrush (size 2–4) in gentle strokes along all the roots. The goal: remove every trace of Agar from the root crotch — the junction between root and stem. This is where Agar tends to hide. Work under strong light. No magnifying glass? Get one. Agar is translucent-wet and the size of water droplets — you will not see it under regular lighting. Rinse with clean distilled water and transplant immediately. Do not leave exposed to open air. A TC plant has no immune system — every minute of open-air exposure is an invitation to disaster.