I use branches all the time from outside and do all of the things that Carlton recommends, except for cleaning with the 1:10 bleach solution. I'm leery about using any chemicals in my terrariums but I do give them a good scrub 1st in the shower. When I do my monthly cleaning I spray everything down with vinegar and water. Works well for me and I've never had any problems. I live in the woods and have used branches of all types such as birch, maple, ash, and gum. Saves a lot of money and does give it a great natural feel. I get fake vines from the craft store, so much cheaper than buying the fake vines from the pet store, and I wrap them around the branches too. I have live plants but they're not big enough to completely fill up the terrarium so the branches and vines are wonderful for filling up the extra space, giving more coverage/climbing areas, and helping them feel more secure in there.