Hosta sieboldii

Hosta sieboldii complex

Hosta sieboldii var. sieboldii (Ingram) W.G. Schmid

Subgenus Schmid Giboshi Zonneveld Giboshi
Section Schmid Nipponosta Zonneveld Nipponosta
Hosta Library species file Hosta sieboldii Part 1
Origin Japan, the entire Japanese archipelago, being particularly abundant in central and western Honshu, Shikoku.   Also in northern habitats, like northern Honshu and Hokkaido, but less prevalent.  .  See Map.
Habitat The habitat extends over different climate zones and the species can be found in very different  ecological systems, ranging from low wetlands and moors, over subalpine meadows to the lower vegetation on mountains and montane forest margins.
Japanese name Koba Giboshi = small-leaved hosta
Plant Medium, 25-40 cm diameter x 20-25 cm high (10-16 x 8-10"), forming a vase-shaped plant.
Leaf Petiole 10–15 cm (4–6"), erect, green with no purple dots at the base.
Leaf 10–15 cm x 5 cm wide (4–6 x 2"), erect and in line with petiole, lanceolate to ovate-lanceolate, petiole transition gradual, decurrent or attenuate, margins entire, in some phenotypes slightly undulate, wavy in the margin, erect, smooth, shiny light, dull, medium to dark green above, glossy lighter green below, tip acute, sometimes slightly acuminate.
3-4 pairs of veins, very lightly impressed above, smooth below.
Inflorescense Scape 25-60 cm long (10-24"), straight and erect, not bending, light green, terete, no purple marks.
Sterile bracts 2-3, tightly clasping stem, persistent; fertile bracts, short, navicular, thin, membranous, green, withering at anthesis, but not falling away.
Raceme 6–12 flowers, widely spaced.
Flowers 5 cm long and 3.5 cm broad (2 x 1.50"),  purple-striped, purple, thin narrow tube, perianth expanding, lily-shaped, lobes spreading, recurving, widely open, short pedicels, projecting stamens and style.
Anthers yellow.
Blooming Time July/early August
Fertility Very fertile
Growing conditions  
Suitable for containers  
Special remarks  
In Hosta Mill Collection No
  • H. 'Bunchoko': a form with a lance shaped leaf and narrow white margin, cultivated in Japan for about 400 years.
    • H. 'Mr. Asami' (Japan/H. Gowen) is a named form of H. 'Bunchoko'
    • H. 'Louisa': H. 'Bunchoko' with white flowers
  • H. 'Carrie Ann' (D. Stone/P. Ruh 1988) = H. sieboldii sport
  • H. 'Fine Points' (Florence Shaw) = H. sieboldii sport
  • H. 'Haku Chu Han' (Japan 1963/AHS 1986) = (= H. 'Shirokabitan' = H. 'Silver Kabitan') is a white centered form with a green margin.
  • H. 'Hirao #58' (Hirao) = H. sieboldii sport
  • H. 'Kabitan' (Maekawa/AHS 1987) = a form with narrow green margins and a center that turns yellow (lutescent), also a very old Japanese cultivar
  • H. 'Kifukurin Koba': a Japanese form, known since the 1930's, green with narrow yellow margin
  • H. 'Kisuji': a form that emerges with bright yellow streaking, the yellow streaks turn chartreuse and green as the season progresses (viridescent).
  • H. 'Mentor Gold' (Wayside/P. Ruh 1978) = H. sieboldii sport
  • H. 'Painted Lady' (Ralph H. Benedict 1984) = H. sieboldii sport
  • H. 'Shima Kabitan' (Japan) = H. sieboldii sport
  • H. 'Shirobana Kika Koba' (Japan) = H. sieboldii sport
  • H. 'Shirobuchi' (Japan) = H. sieboldii sport
  • H. sieboldii 'Albomarginata' is the white margined form, also known as H. sieboldii or H. sieboldii 'Paxton's Original'.
  • H. 'Subcrocea': an all yellow form
  • H. 'White Mule' (Alex Summers/P. Ruh 1998) = H. sieboldii sport
  • H. 'Wogon' (Japan/AHS 1986) = H. sieboldii sport
  • H. 'Akane' (Japan) = H. sieboldii hybrid
  • H. 'Beatrice' (Frances Williams 1962) =  streaked form, very important as a breeder in the 1970's and 80's.
  • H. 'Betsy King' (Frances Williams 1943/AHS 1986) = H. decorata x H. sieboldii
  • H. 'Black Pod' (Fisher 1963) = H. sieboldii hybrid
  • H. 'Butter Rim' (Summers 1969/AHS 1986) = H. sieboldii hybrid
  • H. 'Claudia' (Diana Grenfell) = H. sieboldii x H. clausa f. normalis
  • H. 'Freising' (Hermann Müssel 1970/Heinz Klose 1977) = H. sieboldii 'Alba' x H. 'Fortunei'
  • H. 'Golden Isle' (Eric Smith 1972) = H. sieboldii hybrid
  • H. 'Hirao' () = H. sieboldii hybrid
  • H. 'Honeybells' (Alex Cummings 1950/AHS 1986) = H. plantaginea x H. sieboldii
  • H. 'Lavender Lady' (Frances Williams/Connie Williams 1986) = H. sieboldii 'Alba' hybrid
  • H. 'Lime Shag' (Russ O'Harra) = H. sieboldii f. spathulata hybrid
  • H. 'Masquerade' (Japan/Grenfell & Grounds 1996) = H. sieboldii hybrid
  • H. 'Polly Mae' (R. P. Savory 1982) = H. sieboldii 'Alba' hybrid
  • H. 'Purple Profusion' (Frances Williams/Connie Williams 1986) = H. sieboldii 'Alba' hybrid
  • H. 'Sentinels' (F. Williams/C. Williams  1986) = H. sieboldii x H. 'Lancifolia'
  • H. 'Slim Polly' (Frances Williams/AHS 1986) = H. sieboldii x H. plantaginea
  • H. 'Snow Flakes' (F. Williams/AHS 1986) = H. sieboldii 'Alba' x H. plantaginea
  • H. 'Sweet Susan' (F. Williams 1958/C. Williams 1986) = H. sieboldii x H. plantaginea
  • H. 'Weihenstephan' (Müssel 1970/Klose 1977/P. & J. Ruh 2003) = H. sieboldii 'Alba' hybrid
  • H. 'White Trumpets' (Williams/K. J. W. Hensen 1983) = H. sieboldii hybrid

H. sieboldii 'Angustifolia

Like the species, but with clearly elongated, lance shaped leaves.

H. sieboldii 'Campanulata

Equal to the species, but with bell-shaped (campanulate) flowers.

H. sieboldii 'Okamii

Equal to the species, but with darker tepals.