Bob Hobden wrote:

Sorry about that Dave, never thought to question the name, but now you
mention it, the flowers don't last more than a day.
I remember buying it as D. grandiflora from a specialist in South African
plants, a one man band and now retired. Perhaps he got the labels mixed up.
:-)

No problems Bob, it's a delightful species and one that I would have
acquired if the plants were grandiflora. I've decided to get
grandiflora, bicolor and the search for robinsoniana goes on!

Of the two lots I planted out, one is dead and one is just beginning to make
new growth from the base, the old leaves are all dead. Obviously it was a
lot colder here.

Fingers crossed the clump will make a come-back. If not, I'll send
you some back.

Having looked on the off chance, surprisingly part of his old site is still
alive...http://www.rupert.bowlby.care4free.net/bowlby2.html
Is that photo grandiflora or iridioides? *They are so similar.

It has the broader floral segments of grandiflora. In iridioides,
they are more pointed and the pale brown streaking is rather more
obvious. I'll contact R.V. Rogers to see if they have any of his
Dietes, if they have I can get everything in one go ... apart from the
elusive robinsoniana that is.