@literally45-- I don't know about the flowers but the bark of European larch has been used for various remedies in history. A tonic can be made from the bark for diuretic effects. Some have used it in bath water for better circulation and stimulation. But I don't know if it is still used for these purposes and I don't think you should ingest any of it without doing more research. It might be dangerous because as far as I know, it's a very potent substance.
You can however, burn the bark of the tree as natural incense. It has a pleasant scent and can be used to neutralize energy in the home. In pre-Christianity, European larch smoke was believed to drive away evil spirits and bad energy.