Hi Lou,
It could be real quick if you want some of last years immutabilis...or sprouted seed from this year. Although, I'm not a big fan on shipping sprouted seed, too fragile at that stage, imo. Fresh seed? You are looking at probably a couple weeks or less as I slready have pollinated a few blooms.
Timgod...not sure exactly what you are asking on the crossing thing. Immutabilis is a species, so gives seed true to species, since I'm selfing it or crossing with siblings. In all probability the seed will grow to be some shade of blue. The pink immutabilis are very rare and as mine have yet to bloom this year, the seed won't be coming from them.<g>
I don't dye the water. But a black dye is going to heat the water not cool it. It can be a useful addition in some areas to extend the season, as Aussies won't perform well except in very warm waters. I know Longwood Gardens in PA uses a dye to heat the waters in their Vic ponds and Rich Sacher uses it at New Orleans Botanic Garden display to get a couple weeks jump start in the Spring.
Tammie...the class clown eh? Trying to give the answers away....no seed for you! Really, you have a handful of immutabilis tubers and seed on the way to you already. I promised you it would be this week.<g>
Craig