Yucca gigantea 'Silver Spear' (Silver Spear Giant Yucca )


Botanical Information

FamilyAsparagaceae
GenusYucca
Speciesgigantea
Cultivar'Silver Spear'
CategoryPerennials, Tropicals

Details

USDA Hardiness Zone9a - 11
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cold season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH4 - H1c
RHS Hardiness Ref.
Temperature (°C)(-6.7) - (-3.9)
Temperature (°F)20 - 25
Height3 – 6 m
Spread1.8 - 3 m
GrowthMedium
Flowering PeriodApril, May, June, July

Description and Growing Information

PropagationBy removing offsets.
CultivationGrow in a loam-based compost, but can tolerate chalky soil or sand. It can grow well in soils of any acidity. The soil should be slightly moist but well-drained. In the spring, summer and autumn grow outside in containers. In the winter grow indoors under glass in temperate climates.
PestsScale, yucca moth borers, yucca weevils, leaf spot, and root rot .
Notable SpecimensHarry P. Leu Gardens, Orlando, Florida, United States of America.
HabitatHorticultural origin.
Bark/Stem DescriptionA large, upright shrub or small tree with several trunks forming near ground level and sparsely branched.
Leaf DescriptionVariegated green and blue-grey stiff, leathery, narrow, strap-like, spineless leaves to 1. 2 m in length fan out in clumps.
Flower DescriptionFlowering spikes up to 1 m long appear in summer and autumn bearing large numbers of creamy-white, hanging flowers.
Fruit DescriptionOval to 2.5 cm long, brown, fleshy fruit.

Photographs