I have several different space age iris. I find that I get good blooms - and appendages - with just "regular" care. General good housekeeping so to speak. I have given them extra fertilizer in different years and have not seen a difference. The one thing that does seem to influence production is very cool weather during bud formation. I get lots of bloom with no extras. I also get odd blooms on my normal TB's too. Later in the season, when the weather is more normal, the horns tend to show up .
