Who is using Promix Hp for their citrus trees. I’ve tried the 511 mix and only can get the Reptibark from the pet store to use as the bark portion. Haven’t had great results and am thinking of repotting with the Promix Hp. My citrus overwinter in my heated greenhouse kept at about 8 celcius. I use terracotta pots and they always seem cold to the touch and am also thinking of switching those out to plastic. Any thoughts? I live on Vancouver Island zone 7B.