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The Celtic Druids believed that mistletoe, which is partially parasitic and grows in apple and oak trees, was sacred and contained the soul of the tree.
They chopped it down at the Summer and Winter Solstices and hung it in houses, because it was thought to aid in healing and protect from evil spirits. It was also thought to aid in fertility, which is where the tradition of kissing beneath it originated.

en.wikipedia.org/wiki/Ritual_of_oak_and_mistletoe

The ritual of oak and mistletoe is a Celtic religious ceremony, in which white-clad druids climbed a sacred oak, cut down the mistletoe growing on it, sacrificed two white bulls and used the mistletoe to make an elixir to cure infertility and the effects ... While Pliny does not indicate the source on which he based this account, ...

pss.uvm.edu/ppp/articles/mistlmyths.html

But did you know that mistletoe, now considered a holiday plant, was used as a ... To the ancient Druids of Britain it was a sacred symbol with both magical ...

www.quora.com/How-do-druids-use-mistletoe-What-is-it-used-for

To the Druids mistletoe was a powerful magical symbol, it was dual natured, growing ... Did the druids sacrifice humans? What is the mistletoe ...

www.answers.com/Q/How_did_the_Druids_use_mistletoe

Yes, they start of with spells, though spellcraft bonus isn't relevant to that. You automatically know all druid spells of 0th and 1st level. 0th level spells are called  ...

www.blackhillscelticevents.org/Events/CelticMistle.htm

The Mistletoe does not have roots and is dependent on its host for survival. ... The Mistletoe was a sacred plant in the pagan religion of the Druids in Britain.

www.thewhitegoddess.co.uk/articles/mythology_folklore/mistletoe.asp

The plant in old folklore is called Allheal, used in folk medicine to cure many ills, and indeed the Druids considered the mistletoe to be a sacred plant and ...

www.theholidayspot.com/christmas/history/mistletoe.htm

Mistletoe is a parasitic plant that is commonly used as a Christmas ... The mistletoe of the sacred oak was especially sacred to the ancient Celtic Druids. On the ...

www.slate.com/articles/news_and_politics/explainer/2010/12/whats_the_deal_with_mistletoe.html

Dec 14, 2011 ... But how did a hemi-parasitic plant that grows on tress become asso . ... scoffed at the Druids of the 1st Century A.D. for believing that "mistletoe, ...

www.druidry.org/druid-way/teaching-and-practice/druid-plant-lore

... recorded the Druids' use of four plants for magical and medicinal purposes: Mistletoe, ... The use of plants in ritual: flowers are often used in Druid ceremonies and garlic is ... The ancient Druids did use spells, and contemporary Druids might ...