~ Almond
~ Apple
~ Arbutus
~ Ash
~ Aspen
~ Beech
~ Birch
~ Citrus (any)
~ Cottonwood
~ Dogwood
~ Elm
~ Eucalyptus
~ Fir
~ Guava
~ Hawthorn
~ Larch
~ Madrona
~ Magnolia
~ Mazanita
~ Mulberry
~ Nut (except chestnut & oak)
~ Papaya
~ Pear
~ Pine
~ Ribbon Wood
~ Sassafras
~ Sequonia (redwood)
~ Thurlow
~ Vine Maple
~ Willows (goat, pussy & weeping)
DO NOT use apricot, cherry, peach, prune, plum or nectarine. These trees all belong to the Prunus species. They contain cyanogenic glycosides which release cyanide if ingested.