We noticed that on drip irrigation (we have had it all for two years), irises grow faster and grow more magnificent. But, depending on the genetics of plants, some varieties grow more, for example: "Splendida", "Sharp Dressed Man", "Kathy Chilton", "Romantico", "Adriatic Waves", while others are smaller, for example: "Avenue of Dreams" , "Kitty Kay", "Pop Idol", "Ballerina Queen".