How to Start Hydrangea Cuttings in a Terrarium

Philipp Franz von Siebold and Joseph Gerhard Zuccarini
(Flora Japonica, Sectio Prima (Tafelband).) [Public domain]

Hydrangea cuttings will propagate in damp vermiculite, coarse sand or other sterile medium.  A terrarium-like environment will give your cuttings the best chance to sprout roots.  But you don't want to stick your hydrangea cuttings down a narrow-necked bottle terrarium and hope to fish them out again.  

Much like quarantining plants for use in a terrarium, you'll want to be able to easily retrieve the plant at a later date.  Consider purchasing a wardian case with a hinged door, or you can build a terrarium environment by tenting your potted cutting with a plastic bag.  Check out hydrangeashydrangeas.com for some great tips and photos.