Sacred trees and groves in Germanic paganism and mythology in the context of "Tree worship"

Sacred groves, sacred woods, or sacred forests are groves of trees that have special religious importance within a particular culture. Sacred groves feature in various cultures throughout the world. These are forest areas that are, for the most part, untouched by local people and often protected by local communities. They often play a critical role in protecting water sources and biodiversity, including essential resources for the groups that protect them.

They were important features of the mythological landscape and cult practice of Celtic, Estonian, Baltic, Germanic, ancient Greek, Near Eastern, Roman, and Slavic polytheism. They are also found in locations such as India (Maharashtra, Karnataka, Kerala, and Tamil Nadu), Japan (sacred shrine forests), China (Fengshui woodland), West Africa and Ethiopia (church forests). Examples of sacred groves include the Greco-Roman temenos, various Germanic words for sacred groves, and the Celtic nemeton, which was largely but not exclusively associated with Druidic practice.

Norse, Nordic, or Scandinavian mythology, is the body of myths belonging to the North Germanic peoples, stemming from Old Norse religion and continuing after the Christianization of Scandinavia as the Nordic folklore of the modern period. The northernmost extension of Germanic mythology and stemming from Proto-Germanic folklore, Norse mythology consists of tales of various deities, beings, and heroes derived from numerous sources from both before and after the pagan period, including medieval manuscripts, archaeological representations, and folk tradition. The source texts mention numerous gods such as the thunder-god Thor, the raven-flanked god Odin, the goddess Freyja, and numerous other deities.

Most of the surviving mythology centers on the plights of the gods and their interaction with several other beings, such as humanity and the jötnar, beings who may be friends, lovers, foes, or family members of the gods. The cosmos in Norse mythology consists of Nine Worlds that flank a central sacred tree, Yggdrasil. Units of time and elements of the cosmology are personified as deities or beings. Various forms of a creation myth are recounted, where the world is created from the flesh of the primordial being Ymir, and the first two humans are Ask and Embla. These worlds are foretold to be reborn after the events of Ragnarök when an immense battle occurs between the gods and their enemies, and the world is enveloped in flames, only to be reborn anew. There the surviving gods will meet, and the land will be fertile and green, and two humans will repopulate the world.

In Germanic paganism, Nerthus is a goddess associated with a ceremonial wagon procession. Nerthus is attested by first century A.D. Roman historian Tacitus in his ethnographic work Germania.

In Germania, Tacitus records that a group of Germanic peoples were particularly distinguished by their veneration of the goddess. Tacitus describes the wagon procession in some detail: Nerthus's cart is found on an unspecified island in the "ocean", where it is kept in a sacred grove and draped in white cloth. Only a priest may touch it. When the priest detects Nerthus's presence by the cart, the cart is drawn by heifers. Nerthus's cart is met with celebration and peacetime everywhere it goes, and during her procession no one goes to war and all iron objects are locked away. In time, after the goddess has had her fill of human company, the priest returns the cart to her "temple" and slaves ritually wash the goddess, her cart, and the cloth in a "secluded lake". According to Tacitus, the slaves are then immediately drowned in the lake.

Trees are significant in many of the world's mythologies, and have been given deep and sacred meanings throughout the ages. Human beings, observing the growth and death of trees, and the annual death and revival of their foliage, have often seen them as powerful symbols of growth, death and rebirth. Evergreen trees, which largely stay green throughout these cycles, are sometimes considered symbols of the eternal, immortality or fertility. The image of the Tree of life or world tree occurs in many mythologies.

Examples include the banyan and the sacred fig (Ficus religiosa) in Hinduism, Buddhism and Jainism, the tree of the knowledge of good and evil of Judaism and Christianity. In folk religion and folklore, trees are often said to be the homes of tree spirits. Germanic mythology as well as Celtic polytheism both appear to have involved cultic practice in sacred groves, especially grove of oak. The term druid itself possibly derives from the Celtic word for oak. The Egyptian Book of the Dead mentions sycamores as part of the scenery where the soul of the deceased finds blissful repose.

An Irminsul (Old Saxon 'great pillar') was a sacred, pillar-like object attested as playing an important role in the Germanic paganism of the Saxons. Medieval sources describe how an Irminsul was destroyed by Charlemagne during the Saxon Wars. A church was erected on its place in 783 and blessed by Pope Leo III.Sacred trees and sacred groves were widely venerated by the Germanic peoples (including Donar's Oak), and the oldest chronicle describing an Irminsul refers to it as a tree trunk erected in the open air.