Sterile technique that actually holds
The handful of habits that prevent most contamination — airflow, surfaces, and the order you do things in.
Sterile technique gets talked about like a mysterious skill, but it's really a small set of habits, done in the right order, every single time. Growers who keep contamination low aren't more careful in some abstract sense — they've just removed the moments where the environment gets a chance to compete with their culture.
Where contamination actually gets in
Almost all contamination enters during a handful of specific windows: opening a culture vessel, transferring tissue or spawn between containers, and the seconds right after inoculation before a bag or jar is sealed. Everything else — your grow room, your storage shelf, your gloves — matters far less than what happens in those short windows. That's good news, because it means sterile technique isn't about sterilizing your whole environment; it's about controlling a few seconds at a time, consistently.
The habits that matter most
Work in still air, not moving air — a draft carries spores into an open vessel faster than almost anything else, so a still-air box or a closed room with no fans running beats an open bench every time. Wipe down every surface and tool that will be near an open culture with isopropyl alcohol immediately before you start, not at the beginning of the day. Keep transfers fast: have everything staged and ready before you open anything, so a culture is exposed to open air for the shortest possible time. And work near a flame or in the sterile field closest to your air source first, saving anything less critical for last, since air quality degrades the longer you work.
A simple pre-flight routine
Before touching a single culture, run the same short routine every time: clean the workspace, stage every tool and container you'll need in reach, sanitize your hands and gloves, and only then open anything. Growers who contaminate rarely fail because they didn't know the theory — they fail because they skipped a step under time pressure. Making the routine identical every time removes the decision-making that leads to skipped steps, which is the real reason sterile technique holds up for some growers and not others.