Plant Willow trees at Falador park, Taverley, Varrock Castle, Lumbridge and Gnome Stronghold and Curry trees at Catherby, Gnome maze, Brimhaven, Gnome Stronghold, Lleyeta (if you have done quests) and herblore habitat. The fruit trees take 14 hours to grow so you can do this daily. Also at 51 farming start doing pineapple seeds instead of curry.