I have a friend who left a Redwood (Sequoiadendron giganteum) sapling out in the cold and snow a few months ago. It's still alive- it has some green needles still- but it's slowly getting browner and browner. What can be done to revitalize it?
It's about 8 inches tall, and under 6 months old. It's been in its current pot for about 2 months.
Here's a picture of the tree. It looks like it's planted in sand, which would be bad, but it's an even mixture of sand, potting soil, and mulch. The soil and mulch has just been washed below the sand.