From 35%, you can plant spirit saplings in the spirit tree patch, and from 50% you can protect the allotment, herb and flower patches from disease. At 60% favor, you can join the Farming guild, if you have your Farming level up to 45. From 75% favor, you can join the Wood...
This means you have moved to a location north and slightly east from the observatory. Each square on the Runescape ground is two numbers higher or lower from the adjacent squares depending on in what direction you move. This picture shows the location of a square at the Tree Gnome Stronghold...
When standing on the square just diagonally of the roots, you will be shielded by the jungle plant, which appears to be in front of you. Since the Lesser Demons spawn point is always north of the roots where you are standing, you will never get hurt. However, do beware of the second...