safe way to mark plants?

[cpbobby]

more specifically seedpods?

 

[Wesley]

I've always just used a sharpy. If you're too worried, I'd imagine something like a crayola marker (non-toxic) would also work.

 

[Safety Shears]

little loops of different colored threads

 

[Wire Man]

I usually use colored wire of a thinner gauge. The pigment doesn't wash off.