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Gladiolus (Gladiole)

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Gladiolus comprises some of the most beautiful and easy to cultivate flowering bulbs, preferring rather inorganic soil which should be kept rather dry in winter and moist in spring and summer. Some are winter growing in nature (several South African species) and will lose leaves at low temperatures in winter, but will emerge again in late spring. Species with a hardiness of USDA 7 or 8 are best cultivated as pot plants in a cool greenhouse or wintergarden, thus they will prove as free flowering. All species with a hardiness of USDA 6 are fully winter hardy in Central Europe without any additional winter protection.
Sow at some 5°C preferably in spring (in pots outside) or autumn (in a cool and frosfree greenhouse). Keep pots under cool, yet frostfree conditions and soil always slightly moist. Most Gladiolus seed require a prolonged cooling period for several months before they will germinate with raising temperatures in late spring. Several species tend to have a hypogeal germination, i.e. they make a small corm underground in the first year before the first leaf will emerge in the second year. Pot cultivation for two years before passing on to the open garden, plant bulbs rather deep (some 15cm) to protect them from freezing through. In winter apply some dry mulch layer as additional protection measure. If plants are cultivated in pots, keep them in a cool, yet frostfree spot during winter. Winter dormant species may be placed in shade and soil can be kept rather dry, wintergreen plants require careful watering and full sun.
20 seeds per package.
Articles
Gladiolus scullyi

Gladiolus scullyi

20 (45)cm, makes showy cream, white and greenish flowers with purplish spots on upright stems. Native of clay rocky soils from Namaqualand and western Karoo to Klawer. For any rich, well drained soil in a sunny spot. Requires a good winter protection (i.e. dry mulch layer). Best grown in pots under frostfree conditions in a cool greenhouse or wintergarden with reduced watering and a winter minimum of some 5°C. VII-VIII.

Gladiolus sericeovillosus

Gladiolus sericeovillosus

150 (200)cm, a very tall species with yellow-ribbed leaves, cream to pink or wine red flowers with yellow or green marks. For any rich, well drained substrate in full sun. Requires some good winter protection (e.g. thick dry mulch layer). In colder regions preferably grow in pots under frostfree conditions in a cool greenhouse or wintergarden. USDA Climate Zone 8. VII-VIII.

Gladiolus splendens

Gladiolus splendens

70 (100)cm, makes sword shaped leaves and very attractive bright scarlet red flowers with very large lower petals. For any rich, well drained substrate in a sunny spot. Preferably grow in pots under frostfree conditions in an unheated wintergarden or greenhouse. During dormancy reduce watering to a minimum. VI-VIII.

Gladiolus stellatus

Gladiolus stellatus

35 (70)cm, a showy species with fragrant, white to white and pale mauve streaked flowers. For any rich, well drained substrate in a sunny spot. Best grown under frostfree conditions in a cool greenhouse or cold wintergarden. During dormancy greatly reduce watering and in winter keep plants at a minimum of some 7°C. V-VI.

Gladiolus teretifolius

Gladiolus teretifolius

35 (70)cm, an ornamental species with orange red to scarlet flowers with a nicely contrasting yellow throat. For any rich, well drained substrate in a sunny spot. Best grown under frostfree conditions in a cool greenhouse or cold wintergarden. During dormancy greatly reduce watering and in winter keep plants at a minimum of some 7°C. VI-VII.

Gladiolus tristis

Gladiolus tristis

90 (120)cm, strongly night scented flowers in pale creamy yellow shades, petals with an inner pale brown to greyish stripe. For any rich, well drained substrate in full sun. A dry mulch layer is recommended to protect from freezing through, alternatively ideal pot plant for a cool wintergarden or an unheated greenhouse. USDA Climate Zone 7. VII-VIII.

Gladiolus undulatus

Gladiolus undulatus

100 (150)cm, long-tubed pinkish cream to greenish-white flowers with markings on each lower petal. For any rich, well drained soil in full sun. Needs a good winter protection /mulch layer). Ideal for a frostfree cultivation in the unheated greenhouse or cool wintergarden. Zona Climática USDA 8. VII-VIII.

Gladiolus uysiae

Gladiolus uysiae

7 (15)cm, a dwarf species with fragrant showy pale purplish upper and yellowish lower petals on short stems. Native of clay rocky soils from Bokkeveld Escarpment and western Karoo to Ceres. For any rich, well drained soil in a sunny spot. Requires a good winter protection (i.e. dry mulch layer). Best grown in pots under frostfree conditions in a cool greenhouse or wintergarden with reduced watering and a winter minimum of some 5°C. VII-VIII.

Gladiolus venustus

Gladiolus venustus

25 (40)cm, makes several slender leaves, lipped and sweetly musk-rose scented (!) flower of mauve or cerise color, and lower petals flexed downwards, greenish yellow below. USDA Climate Zone 8. VI-VII.

Gladiolus vinosomaculatus

Gladiolus vinosomaculatus

70 (110)cm, a tall species with sjowy creamy-white flowers and maroon spots on upright stems. For any rich, well drained soil in a sunny spot. Requires a good winter protection (i.e. dry mulch layer). Best grown in pots under frostfree conditions in a cool greenhouse or wintergarden with reduced watering and a winter minimum of some 5°C. VII-VIII.

Gladiolus virescens var. virescens

Gladiolus virescens var. virescens

15 (25)cm, a dwarf species with narrow leaves and quite large, sweetly scented yellowish-green to rose flowers. For any rich, well drained substrate in full sun. Requires a good winter protection (thick mulch layer), preferably grow in pots under frostfree conditions in a cool wintergarden or greenhouse. V-VII.

Gladiolus watermeyeri

Gladiolus watermeyeri

15 (35)cm, a medium sized species with most ornamental, strongly fragrant, cream flowers with prominent brownish-purple veins and a lower greenish yellow petal. V-VII.

Gladiolus wilsonii

Gladiolus wilsonii

30 (60)cm, makes showy, fragrant pure white flowers above very narrow leaves. For any rich, well drained substrate in a sunny spot throughout the year. A winter green species which should be grown in pots under frostfree conditions in an unheated wintergarden or greenhouse. During dormancy reduce watering to a minimum. VI-VIII.