Use to select wands/other tools; burn in candle spells; add chips to charms/spells, etc.

Alder: water magic, strength, foundations.
Apple: love, spirit food, unicorns, beauty, regeneration, eternity.
Ash: study, health, enhance magic, peace, re-birth, awakening, Underworld.
Aspen: overcoming obstacles, intuition, Otherworld communication.
Birch: purification, blessing, health, beginnings, vitality.
Blackthorn: control, stimulus, chaos energy, obstacles, friction, challenges, coercion.
Elder: cleansing, offering, Fairies, changes, evolution [never burn the wood].
Fir/Pine: prosperity, birth/rebirth, power, nobility, discretion, objectivity.
Gorse: opportunity, wisdom, interaction.
Hawthorn: purity, protection, Fairies, pleasure, stimulation, misfortune.
Hazel: wisdom, creativity, enhance perceptiveness, Witchcraft skills.
Heather: success, prosperity, gateway.
Holly: enhances magic, balance, challenges, testing.
Ivy: fertility, love, persistence, development, tenacity.
Linden: immortality, protection, good fortune, sleep, love.
Mountain Ash [Rowan]: protection, enhances magic, insight, cleansing.
Oak: fertility, power, balance, protection, success, truth, strength, courage, endurance.
Poplar: success, recognition, fame.
Red Oak: inner transformation, harmony.
Vine [Grape or Berry]: happiness, introspection, rebirth/renewal, transitions, ancestry.
Willow: Moon magic, psychic power, spirits, death passage, intuition, flexibility, Crone energy.
Yew: transformation, psychic awareness, spirits, death passage, immortality [do not burn].

Excerpted from Grimoire for the Green Witch, by Ann Moura