I am based in London, UK.
I have recently acquired a late Dutch Honeysuckle (Lonicera periclymenum 'Serotina').
However, after a few weeks, the leaves have started going slightly purple - I want to take good care of this plant, so I would like to know how to solve this problem.
As Can be seen in the image below, it seems to be the leaves right at the ends of the stems of the plant.
The instructions given to me with the plant suggested it would need considerable watering - I took this to heart, so I watered the plant well to begin with. Since then, it has been quite rainy and the soil has remained damp, so I can't see there being an issue with too little water.
The stems at the ends of some of the plant are also purple-ish in places, as can be seen in the image below:
What could be causing this discolouration, and how do I deal with it?
Edit: additional photos
The plant is attached to a pole, north facing, but it gets sunlight ( garden is south facing ). There are canes and seashells on the ground to stop the local cats from digging the fresh soil up.
Here is a close up of the stem going into the ground: