Posted: 26/03/2015 at 09:58
Bonemeal is Poudre d'Os and is good for promoting strong roots. I have no more Blood, Fish and Bone so can't give you the exact French translation. However, if you can get it, pelleted fumier de vache, poule et cheval will do the job too and is clean and easy to handle.
Bleu bordelaise treats algae and fungal infections and is not a fertliser. I would give your box plants a generous helping of the slow release fertilsiers mentioned plus an instantly accessible liquid tonic of engrais liquide pour tomates.
You can also make your own liquid feed for greenery by soaking nettles in a bucket of water (with a lid on for the smell) for a couple of weeks and then diluting the resulting nitrogen rich stew 10 to 1 with water and using as a foliar feed by pouring it over the plants. You can do the same with comfrey and the resulting stew is good for flowering and fruiting plants because it has a wider range of nutrients.