Hoya plants are popular among houseplant enthusiasts, known for their diverse foliage and often fragrant, star-shaped flowers. Hoya ‘Nova Ghost’ and Hoya ‘Grey Ghost’ are two sought-after varieties that frequently cause confusion due to their similar names and silvery leaf appearances. This article clarifies the distinct characteristics that differentiate these two Hoya cultivars.
Hoya Nova Ghost
Hoya ‘Nova Ghost’ displays silvery-green foliage. New growth often emerges with a light, iridescent silver hue, which can gradually deepen to a muted green as the leaves mature. The leaves are typically fleshy and can feature subtle splash patterns or venation. This cultivar is a sport of Hoya carnosa ‘Argentea Princess’, meaning it developed as a natural mutation.
The growth habit of Hoya ‘Nova Ghost’ is moderate, forming trailing or climbing stems. Its leaves tend to be shorter than ‘Grey Ghost’, with closer spacing along the vine. The texture of the leaves can feel slightly pubescent, and prominent veining is often detectable by touch or when viewed against light.
Hoya Grey Ghost
Hoya ‘Grey Ghost’, a cultivar of Hoya carnosa, is distinguished by its consistent silvery-grey leaf coloration. The leaves are predominantly grey, often with minimal green, and exhibit a dense covering of silvery speckles. This stable grey hue is maintained throughout the leaf’s lifespan.
The leaves of Hoya ‘Grey Ghost’ are typically thick and waxy, possessing an elliptical shape. They are arranged oppositely along the stem and can reach lengths of up to 8 cm. While its vining stems can reach up to 3 meters long, it is commonly a slower grower compared to ‘Nova Ghost’.
Comparing Nova Ghost and Grey Ghost
The primary distinction between Hoya ‘Nova Ghost’ and Hoya ‘Grey Ghost’ lies in the nature and stability of their silvery foliage. Hoya ‘Nova Ghost’ exhibits a more dynamic coloration, with its silvery sheen often more pronounced on new growth and sometimes appearing iridescent, potentially shifting as the leaf ages. In contrast, Hoya ‘Grey Ghost’ maintains a consistent, matte silvery-grey appearance across all its leaves, from young to mature.
Leaf morphology also offers distinguishing cues. Hoya ‘Nova Ghost’ generally has shorter leaves that are less widely spaced along the stem, often featuring prominent veining that can be felt or seen, and their tips tend to be sharper or more pointed. Conversely, Hoya ‘Grey Ghost’ leaves are typically thicker, feel rougher to the touch, and are less pliable. Their tips can be dull or rounded, and the overall leaf shape may appear narrower or more irregular. The back of ‘Nova Ghost’ leaves can also display a more pronounced silver.
Cultivation Considerations
Both Hoya ‘Nova Ghost’ and Hoya ‘Grey Ghost’ share similar general care requirements, aligning with most Hoya species. They thrive in bright, indirect light, which is important for maintaining their silver coloration. Direct sunlight should be avoided, as it can scorch their leaves. Adequate air circulation is also beneficial.
Watering should be moderate; allow the soil to dry out partially or completely between waterings to prevent root rot. These Hoyas prefer well-draining potting mixes, such as a blend of succulent potting soil and perlite, or a chunky mix including peat moss, perlite, and orchid bark. They adapt well to average household humidity, though moderate to high humidity can enhance their growth. Ideal temperatures range from 18-25°C (64-77°F), with tolerance for slightly lower temperatures, but avoid anything below 10°C (50°F). Fertilize once a month during the growing season with a diluted liquid fertilizer to support healthy development.