you might think my clumps look fairly small, but that is on purpose. my growing space is very limited, and i have to purposefully keep my clumps in check.
so far my little garden has experienced tremendous growth from the following irises:
'cozy cotton' a rebloomer
'cozy' outgrew it's 10-15 gal. pot. during its first year. put up multiple stems and reblooms all the time. the ffe bloom was 3 months after planting and was 41" tall. which is unheard of, because my irises tend to be much shorter than the posted heights. ex: if it says 36" mine usually reach 24-30".
'exposé' not a rebloomer, but reblooms for me.i love the color and striping. loved it so much i bought another iris like it 'lucy lovejoy'. unfortunately lucy isnt' performing well,
'autumn explosion' a rebloomer
this one had rot, but sherry/@henhouse told me not to worry it would outgrow its rot and then some. she was right.
i love the beards on this iris, and it performs every year, even in half shade.
(little beyond your date limit. but a real trooper)
not a tb but an ib. but, this one is hard to contain because it grows so well.
'concertina' a rebloomer
this beauty is. it's wonderful to see glowing if planted in the garden where it can be observed backlit by sunset.
love this one, and 'capt. thunderbolt'. however, the 'capt.' doesn't grow as well for me, and so far the blooms have been really short about 10-12" and it's in its 2nd yr.
this one is way past your date parameters but i just really love this one. i like the color, form, and blooming extras.
'wing commander' not listed as a rebloomer, but has rebloomed multiple times for me.