This form of the species H. longipes is a cultivar from
of Indiana which was registered in 2009 by
Kevin Walek (Hosta Registrar)
on her behalf. It forms a large size hosta about 19 inches high that
spreads to 56 inches wide. The leaves are slightly wavy and slightly corrugated
with above average substance. It has dense clusters of pale purple flowers with
purple anthers borne on 20 to 30 inch scapes in August into September.
The Hostapedia by Mark Zilis (2009), "H. 'Iwa G' = H. longipes 'Iwa
Soules'...Normally "Iwa G" would just be short for "Iwa
the Japanese common
H. longipes. In this
case, however, Van
Wade of Wade and Gatton Nursery (Closed 2019) of Ohio credits this plant to "Soules", i.e.
Marge Soules. Marge imported a form of H. longipes from
Japan, which was dubbed 'Iwa Soules' by
Nomenclature changes recommended in the
1991 book The
Genus Hosta by
W. George Schmid and accepted by The American Hosta Society would update names as follows:
H. tortifrons is now H.
and H. tardiflora is H.
This seedling of the
species, H. longipes is a small size plant
blooms from August into September.
is one of the many natural hybrids of H. longipes in cultivation, but the
use of the formal Japanese name as a cultivar name is technically incorrect
because it applies to and is taxonomically linked with the type of H.
longipes. Since this cultivated taxon originated with a Japanese import by
Soules Garden, I have renaimed it H. 'Iwa Soules'. It flowers later than
the species and may be a hybrid with H. aequinoctiantha or one of its
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term iwa as rock, Iwa Gibōshi or
An article about Fall Bloomers by
Herb Benedict and
Jim Wilkins in
Hosta Journal (1991 Vol. 22 No. 1) states that, "Here
are some of the fall blooming plants we grow...(listed in the order of bloom
times in Michigan).
|1) H. kikutii
||A medium size plant densely flowering
with white blooms. The flowers are equally arranged around the
central axis of the raceme so that the bloom scapes resembles a
bottle brush or pony tail...We are growing two named varieties,
'Hirao-59' and 'Finlandia'.
|2) H. 'Fall Bouquet'
||Small, green plant, leaves slightly
undulated, lavender scape and blooms, floriferous.
|3) H. longipes
||Small green plant, densely flowering
with a tall stiff bloom scape. The flowers are lavender and the
leaves are green.
|4) H. gracillima
||Funnel-shaped, light lavender flowers.
A miniature green plant, with shiny surface.
|5) H. 'Iwa
||Iwa means rock, and this plant was
imported by Marjorie Soules, from Japan. It is a small green plant
with lavender flowers.
|6) H. tortifrons
||In the same section (Picnolepis) as
H. longipes and
H. rupifraga. Distinctive small plant, with twisted
green leaves and lavender flowers.
|7) H. 'Fused Veins'
||Small, green leaves often with ╝ inch
margin which is a lighter green. The lance shaped leaves are
undulated and the veins come together regularly. The flowers are
mauve and the scape is sometimes branched.
|8) H. rupifraga
||Small, medium green, with thick,
leathery, ovate leaves. Densely flowering with purple flowers. 'Urajiro',
'Grand Slam', 'Maruba Iwa'
|9) H. tardiflora
||This small hosta is the last to bloom
for us. Its leaves are shiny, dark green and lance shaped. The
flowers are light lavender and borne in abundance on 12 inch scapes.