Honestly, I’ve had luck with plastic wrap / cling wrap and tape or cling wrap / plastic wrap and rubber bands.
StrakaFlocka
Came here to say the same! Wrap the top of it tightly with Saran Wrap. Put a rubber band around it to hold it in place. Then if you want to clean it up a bit take a razor and make a clean cut all the way around the jar slightly below the rubber band. Then if you want to be really fancy you could cover that with twine or something.
palufun
Depending on the diameter–you can purchase round wooden balls or cork. You may be able to use what I (chemist) call a watch glass–it is a thin concave piece of glass (they come in quite a few sizes). [Picture of watch glass](https://www.flinnsci.com/watch-glass-100-mm-borosilicate-glass/gp8009/)
JestersWildly
Most large home candles with wooden lids fit perfectly, but you can also use those cork rounds for plants from your local hardware store. a few bucks for just enough circle to keep the moisture out. That said, water vapor is slightly forgiving with mostly-closed containers. you could literally put a piece of printer paper over the top and get a good enough seal for a stalwart method, then just fill the remaining when the paper sags enough to break the seal (if it does).
Edit- or you could put a pothos/monstera cutting in it to propagate and just add water as it lowers/evaporates
4 Comments
Honestly, I’ve had luck with plastic wrap / cling wrap and tape or cling wrap / plastic wrap and rubber bands.
Came here to say the same! Wrap the top of it tightly with Saran Wrap. Put a rubber band around it to hold it in place. Then if you want to clean it up a bit take a razor and make a clean cut all the way around the jar slightly below the rubber band. Then if you want to be really fancy you could cover that with twine or something.
Depending on the diameter–you can purchase round wooden balls or cork. You may be able to use what I (chemist) call a watch glass–it is a thin concave piece of glass (they come in quite a few sizes). [Picture of watch glass](https://www.flinnsci.com/watch-glass-100-mm-borosilicate-glass/gp8009/)
Most large home candles with wooden lids fit perfectly, but you can also use those cork rounds for plants from your local hardware store. a few bucks for just enough circle to keep the moisture out. That said, water vapor is slightly forgiving with mostly-closed containers. you could literally put a piece of printer paper over the top and get a good enough seal for a stalwart method, then just fill the remaining when the paper sags enough to break the seal (if it does).
Edit- or you could put a pothos/monstera cutting in it to propagate and just add water as it lowers/evaporates