Elstan is the gardener of the farming patch outside Falador. He will look after the 2 allotment patches if paid. Elstan is an important character in the Garden of Tranquilityquest and can answer questions in the Fairy Tale I quest, for he is a G.A.G. member.
Elstan also sells basic farming tools, which can be accessed by talking to him and asking "Can you sell me something?". It is not an actual shop and it has no set stock; each item has to be bought individually through the dialogue.