Some medicinal plants are actually poisonous. In the right quantities, they can cure illnesses.
Feeding a unicorn or a Pegasus needs infinite patience, because these wonderful creatures are extremely shy and show themselves only very rarely. Once you have finally gained their trust, they can be stroked and sometimes they will even eat from your hand. But they really only eat the tastiest flowers and sweetest fruits. Their favourite mushrooms are even toxic to other creatures. Help the elves to feed and groom the unicorn!