ACACIA - Silk Tree would be in this group
APPLE -(Insecticide residue likely cause for periodic issues)
AILANTHUS - Tree of Heaven
ALDER - white alder
ALMOND

ARALIA - Fatsia japonica
ASH - Fraxinus
ASPEN - Populus
BAMBOO
BARBERRY- Berberis
BIRCH
BEECH - Fagus
BOIS D'ARC - horse apple tree
BOTTLE BRUSH
BUTTERFLY BUSH
CAMELLIA
CITRUS -
(lime, kumquat, grapefruit, orange, lemon)
CORK - (not wood from cork oak, but cork)
CORN PLANTS
COTTONWOOD - Populus
CRABAPPLE - Malus
CRAPE MYRTLE
DATE
DOGWOOD - Cornus
DOUGLAS FIR - Pseudotsuga
DRACAENA
ELM - Ulmus
ESCALLONIA
EUCALYPTUS
FIG
FIR - genus Abies
GINKGO
GRAPE VINES
GRAPE PALM
GUAVA
HACKBERRY
HAWTHORN - Crataegus
HIBISCUS
HICKORY
IRONWOOD - toxic leaves
JADE PLANT
KALANCHOE
LARCH - Larix
LILAC - Syringa
MADRONA / MADRONE - Arbutus
MAGNOLIA
MAPLE - Acer
MANZANITA - Arctostaphylos
MESQUITE - tendency to be sharp
MIMOSA
MOCK ORANGE - Phladelphus
MOUNTAIN ASH - Sorbus
MULBERRY - Morus
NANDINA - (aka heavenly bamboo)
NORFOLK ISLAND PINE - Araucaria
NUT TREES - exclude chestnut
ORANGE - sources lean toward safe but why be sorry
OREGON GRAPE - Mahonia
PALM
PAPAYA
PEAR
PECAN
PINE - Pinus
PHOTINIA
POPLAR - Populus
PUSSY WILLOW - Salix
RAPHIOLEPSIS - Indian Hawthorn
RIBBONWOOD
ROSE - Rosa
RUBBER PLANT - Ficus elastica - Weeping Fig
RUSSIAN OLIVE
SASSAFRAS
SILK TREE
SPIRAEA
SPRUCE - Picea
STAGHORN SUMAC
STRAWBERRY TREE - Arbutus like Madrone
SWEET GUM
SYCAMORE
THURLOW
TREE FERN
VIBURNUM
VINE MAPLE - Acer
WEEPING WILLOW - Salix
WIEGELA
YUCCA