Interestingly, while these look hardy they actually need to be hydrated immediately. They are in fact the growing tips of a new fern frond, and as such demand a lot of energy. They should be hydrated immediately upon arrival. Dark stems disguise potential problems, so look closely for blackening or blue-ing of stems as well as checking whether stems are limp. Cut the stems with a sharp instrument and hydrate in a low sugar holding solution. Hold at 45-55F.