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Absolute bone drought from end of flowering until late autumn or even winter if there's a little moisture in the air. Some lime when potting it and high potash fertilizer, low as possible nitrogen. Systemic insecticide and fungicide regularly, but on a dry, windy day so the liquid will dry almost immediately. A few greenfly on it, and it will keel over almost over night. Have fun
Oh, and David, it's an oncocyclus iris, (bearded, rhizomatous) not a juno (beardless, bulbous).
You really want all of us to try it do'nt you Lesley...