December is a bit late in the year to be planting but it's not out of the question. Earlier in the week I divided a pot of Primrose (Primula vulgaris); they were outdoor grown -rather than in a polytunnel- and hardy enough to go in the ground.
I also planted some bulbs of Tulipa viridifolia 'Spring Green', a white tulip with a pronounced green stripe. In fact a later planting for tulips is preferable. They are prone to 'tulip fire blight' in early autumn when the weather is warmer. Being a fungal disease it is less prevalent in cooler conditions.
Seems we are due for some frosts in the days ahead so it will probably be spring before I do any more planting.