How To Grow Bearded Iris In Zone 9. 26052021 Give room to your iris to breathe because good air circulation is required to grow Bearded iris. They receive full sun until after 2PM.
Siberian iris plants grow to a height of 2 to 4 feet tall and are hardy in zones 3 to 9. 26062019 I live in zone 9 not zone 8 and we are probably a lot drier here than where you are but until someone from your area comes along this has been my experience with growing irises in potsplanters. At one time it was thought that bearded iris required only a small amount of bonemeal which was said to be safe and that no other type of fertilizer was needed.
Bulbs are available from specialty catalogs.
If you have only ONE rhizome you can grow it in a one gallon pot for about a year summer to summer. 07062021 The flowers grow from rhizomes. You can keep less space for dwarf iris. 03062021 Plant it at the same level or even slightly higher in the ground.