Most Spuria are 3' to 5 ' tall. Unless you have purchased dwarf Spuria. They like to stay where planted for a long time,so give them plenty or room to grow. Plant them about every 4 feet. Like all plants they like good drainage. They can take a heavier soil, even clay, maybe a bit alkaline. They are pretty easy to grow. Make sure they have ample water through the winter months, but after bloom they don't need much water during the summer months. . Some of them stay green all year but most go kind of dormant after bloom, the leaves turn brown and should be cleaned off. New growth is going strong at this time of year. They do form large clumps but do not need dividing often like the bearded iris do. They are said to be heavy feeders but mine thrive on neglect. You probably know, they resemble the dutch iris in appearance. Which ones did you get and from which hybridizer? Carolyn in Los Gatos CA with lots of iris