Background: I sowed my first batch of tomatoes on April 4th on those transparent 12-grid trays w/ domes that are supes trendy right now, potted them up on May 4th & 5th into 3-inch transparent pots (which I now understand may not provide the ideal darkness for their roots, live and learn), and I would like to transplant them outdoors soon.
Questions: One concern that I have (and I’m not sure how concerned I should be) is potentially introducing outdoor wildlife into my indoor environment during the hardening off phase.
- Do other gardeners worry about this or am I over thinking it? Is it basically set them on a table (not on the ground), don’t leave them out there for too long, and hope for the best?
- What other steps can I take to keep my indoor environment as sterile as possible while hardening off some plants when they’re ready?
ETA Additional Reading: Hardening Off Seedlings: How to Safely Transition Indoor Plants Outdoors


My general approach is that my young seedlings live in one room until its time to harden them. Once they’ve left the nursery room, they dont go back there, so there’s no chance of transferring a pest.
In terms of other critters, most outdoor stuff doesnt want to be indoors. I’d be more concerned about bringing a foreign object from inside someone else’s house into mine than from outside inside.