Irises not flowering?

[Stickleback]

Hi there. I have three irises awaiting relocation to my new pond once finished (see photo below.). The middle one is a new yellow flag which I'm sure will do fine ('cos it's a native plant and a natural thug!!!!) ... however I'm concerned about the iris versicolor on the left and the Black Gamecock on the right. This is now their third summer and no sign of any flowers from either . I repotted them in the spring into 5l baskets and they have about 2 inches of water above the crown. The rhizomes are lying across the surface about halfway buried. They are getting 2 fertiliser tabs per month each. They are facing south west so get plenty of sun from late morning onwards. The leaves are looking lovely and healthy, but no flowers!!!! Does anyone know what the possible problem may be?

Thank you all for your kind assistance!!

Stickleback

 

[addy1]

Mine are just in water, no soil, no fertilizer except the fish. I don't recall if they need to be x old before flowering. They have been growing for a lot of years.

Your plants do look healthy!

 

[Lisak1]

You may be overfertilizing, believe it or not. Plants that get too much nitrogen will put all the energy into lush green leaves but won't bloom.

 

[Stickleback]

You may be overfertilizing, believe it or not. Plants that get too much nitrogen will put all the energy into lush green leaves but won't bloom.

Thank you!!! That's good to know. I'll rein back on the osmacote and see what happens.....