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Suzette writes:

:     Who decides whether an iris is sdb, ib, etc?  I assume it's by height
:     but what if an iris is just tall.  Would it change like from an IB to
:     TB?  Can you cross an IB with a TB?  What would it be?

The hybridizer decides what class to register an iris in. There are explicit
requirements for each class, so it's usually not a difficult call. In
some cases it can be: the BB/TB and MDB/SDB boundaries are notoriously

Regarding crossing the different types (and where to place the progeny),
most IBs are produced by crossing TBs with SDBs. But most IBs are sterile,
so the question of how to classify an IB x TB seldom comes up. The bottom
line is that AIS uses a _horticultural_ classification system, so regardless
of what cross produced an iris, it is classified according to its actual
plant characteristics (height, season of bloom, proportion, etc.). So
if an IB x TB offspring was over 27 inches tall and bloomed with TBs, it
would be a TB.

Happy irising, Tom.


Tom Tadfor Little         tlittle@lanl.gov  -or-  telp@Rt66.com
technical writer/editor   Los Alamos National Laboratory
Telperion Productions     http://www.rt66.com/~telp/

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