NC soil amendments for tropicals?
Our soil here in the Triad is completely clay-I garden as naturally and organically as possible ( I do use vermiculite, which I've heard is not organic). So I know that amending/fertilizing tropicals might be tricky and I already attract all the insects around to my garden (I'm surrounded by pesticide rich farmland-all the bugs feast on my organic foliage!). I am wondering what type of sand is best -we have a creek with pretty loamy sand that I usually use for plants that like it well-drained-but the creek isn't exactly clean and pure-more like a ditch. I'm trying to go low-budget with the soil so I can afford a few more choice plants! I'm not sure about ratios, but
I was guessing I would use a mix of :
Plant-tone (organic all purpose fertilizer-not too strong)
maybe lava rock for Hawaiian cordylines (ti)?