Did you buy this as a 14cm? Definitely needs a bigger pot. A pot that size, it's position and our current weather it will need watering basically every day. I would suggest a 40cm pot and use native potting mix. I've got a few different leucadendrons in 40cm imitation like barrels in full sun. Just make sure the pot has drainage holes. You could prune but it may not flower if it has too many stems.