He swore to Gandalf not to lose him and he is taking this promise very seriously often riskin his life to follow him. He will do anything he must to continue on the journey with Frodo.
Sam used to be the gardener for Frodo when they lived in Hobbiton and he took great pride in the gardens at Bag-end.
Now accompanying Frodo on his perilous journey Sam will face many dangers in order to help Frodo complete his quest and destroy the one ring.