Silver Ivy (flora, magic item?)

this metallic looking plant acts most unusually. D6 feet will be found, to use it you cat one foot sections off and wrap it around your wrist, after d6 hours, the ivy will begin to inch round you. It absorbs one Hit Point per day and provides the following benefit
+2 on saving throws vrs poison, take one less point of damage from magical attacks
You only need half your normal water and food
It can be eaten to gain D8 HP
it dies after d6 plus 3 weeks, it may be plated before it dies and grow one foot a month if provided daimy a small bit of meat