Sorry I've been a bit absent Gordon. I'll have a crack at answering your query on aggies.
They definitely do not like having wet roots. They are super unfussy in moderate climes. Down-right weedish in fact. They will grow in drainage ditches and alongside ponds but they do not prefer this.
Mature aggies have thick white fleshy roots that hold water during drought times. Once they're mature, they're pretty hard to kill from lack of water.
Once a big thick basal area has formed, they will survive quite severe frosts as the foliage protects the basal area. They do not like frozen ground - at all. Once their fleshy roots freeze, its the end of them.
Flowering is all about daylight hours. Well, sunshine hours really. The sooner you can get it into the spring sun, the better. They flower in the height of summer but only if they've had enough sunshine days up til then. They will not flower in the shade, even dappled shade will reduce flowering substantially.
They prefer impoverished soil. Stony, gravel, sandy, baked hard. You get the idea. No feeding for a few years. This makes long, weak foliage rather than flowers and water-retaining roots.
Here's what I'd do. As soon as the winter freeze ends, get it out into the spring sun but protect from cold winds or drastic temperature changes (under clear plastic cover perhaps?). Direct, baking heat all summer. Give it a little bright shade through the worst of the day if the edges of the leaves start to burn (yellow). Water it well once a week. Allow it to totally dry out in between.
Best of luck Gordon!