There are plants that are associated with Christmas, there are plants that have “Christmas” in their name too but have absolutely nothing to do with this festive season.
Mistletoe (Viscum album) is associated with amorous engagements purely since it was recognised as symbol of fertility and vitality. In reality toxic although not lethal. Mistletoe isn’t grown, it hosts off other flora sometimes killing the parent plant. So, actually a parasite and poisonous.
Poinsettia (Euphorbia pulcherrima) or Spurge to you or me. Not very festive sounding. It is considered a house plant but under the right conditions can be transplanted after the new year and when conditions are warmer. These aren’t very easy to keep though. The conditions are important. The plant needs to be warm enough but not too hot. Some sunlight but not too much. It needs water but not excessive and the soil must be free draining. It will flower again if these conditions are adhered to.
Holly (Ilex aquifolium) associated with Christmas largely because of its berries are borne at this time. A much needed food source for birds over the colder months. This plant can take the form of a tree, shrub, or climber by its species. It can be argued that cotoneaster offers an equally stark contrast in the winter months yet it is not associated with this period. There are references to the leaves resembling thorns although this has no relativity to the plant.
Ivy (Hedera helix) is long associated and references made in carols. A very invasive plant. I’m not a fan of Ivy. I take the view that it does impede growth. It takes moisture from other plants and competes for space. Once in situ the growth is very prolific and can cause problems on brickwork or stone. Like other plants not the direct cause of its demise but a contributing factor. With brickwork, will not cause the deterioration but certainly does not help in preventing decay.
Christmas Box (Sarcococca) is perhaps referred to as a winter flowering shrub. It provides sweet fragrant white flora throughout the winter months. An evergreen it provides attractive foliage at other times of the year. It will bear berries after flowering so an important food source. But not directly linked to Christmas.
Lentern Rose / Christmas rose (Hellebrous niger) no link to Christmas or Roses. It is not related in anyway to Rosa. Perhaps because it provides winter interest. An effective perennial in a shaded area needing little maintenance providing colour and interest where there few other plants in bloom.
There are plants that are celebrated at Christmas purely because they flower at this time. Christmas Cactuses being one. Having said this, other cultures bring a wealth of richness with other forms of acknowledgement. Olives for peace, Opium poppy pods for prosperity and bulrushes for prosperity and good fortune which are equally important.