Well, I had really in depth conversation about which trees I owned and what size pots they were going in and what my plans were for the season. I told them I had pine bark, sphagnum moss peat, perlite and molar clay. There advice was to use a 50/50 of molar clay and perlite. They explained it was a drier mix and told me If I found I was watering a lot I could contact them for advice.
I thought it would be a quick answer but they spent ages explaining everything from particle size to temperature, surface tension to storage of nutrients.