Contents
About Hoya
Hoya, commonly called the wax flower, is a genus in the Apocynaceae family. It includes vines, trailing plants, and specimens that grow on supports, mainly spread across Asia, Australia, and Pacific islands. In nature, many are epiphytes: they attach to trees without parasitizing them.
Hoya is cultivated for its foliage and waxy flowers grouped in umbels. Some flowers have a subtle fragrance, others have a strong scent. The number of species and horticultural selections is constantly growing, so new plants regularly appear in collections.
See the Hoya & Dischidia collection
Hoya flowers have a waxy appearance and appear in umbels.
Cultivation Highlights
Light, watering, and fertilization values are indicative. Actual needs vary by variety, pot size, substrate, season, and microclimate. A Hoya with thick, fleshy leaves generally tolerates watering intervals better than one with thin leaves.
Why Hoya Looks Different in Cultivation Compared to Its Natural Habitat
A Hoya grown indoors or in a greenhouse can look very different from the same plant observed in its natural habitat. In nature, light, water, and nutrients are limited, and the plant adapts its leaves to the conditions where it grows. In a greenhouse, with regular fertilization, available water, and controlled light, leaves can become larger, rounder, and fleshier.
It is not always a genetic mutation. Often it is the plant’s natural response to better growing conditions. Some visible traits in nature fade, while others become more pronounced. Therefore, you cannot always identify a Hoya by a single leaf: compare leaf shape, veins, growth habit, peduncles, and flowers.
Light
Hoya prefers filtered but strong light. For many varieties, a few hours of gentle morning sun help form peduncles and promote flowering. Strong afternoon sun can burn the foliage, especially in variegated forms.
There are two possible directions. In lower light, leaves often remain dark green, glossy, and spectacular, but the plant may form few or no peduncles. In very good light or with morning sun, foliage can become lime green, thicker, fleshier, and sometimes smaller, but peduncles that turn into flower umbels appear more easily.
Some Hoyas do not flower without sun. Varieties like Hoya erythrostemma, for example, require strong light and high temperatures to bloom. Without sun, the plant may grow searching for light but will not flower.
Watering, Substrate, Fertilization
Watering. Water after the substrate partially dries out. Do not keep the pot constantly wet and do not let water pool around the roots, in the saucer, or decorative cover. In winter, when light decreases and growth slows, reduce watering frequency.
Substrate. Hoya needs an airy mix with good drainage. The substrate for Anthurium and Hoya is suitable as a starting point. The pot must have real drainage holes.
Fertilization. Fertilize in spring and summer with a diluted dose. A balanced fertilizer is sufficient for growth; for mature plants monitored for flowering, you can alternate with an orchid fertilizer higher in phosphorus. Water the substrate before fertilizing.
Flowering
Hoya can flower in the first year, after 1-2 years, or after several years. It varies by variety, plant age, and growing conditions. A young cutting first needs to develop roots and foliage; a mature, stable specimen has a better chance to form peduncles.
Do not choose an oversized pot and do not repot frequently without reason. In a too-large pot, the plant invests first in roots. Many Hoyas tolerate a pot slightly full of roots and can flower more easily this way. Repot when the substrate has degraded, roots have problems, or the pot is no longer stable. Before any intervention, read the Indoor Plant Repotting Guide.
Do not cut peduncles after flowers fade. Most Hoya varieties bloom again on old peduncles.
Propagation
Cuttings are the most practical propagation method. Cut a stem section with 1-3 nodes, remove leaves from the base, and place the cutting in sphagnum or a lightly moist mix of perlite and peat. You can also use water for rooting, then move the cutting to substrate when roots are sufficiently developed. Rooting time varies with temperature and variety.
Available Varieties
Stock changes constantly, but these varieties are currently available: Hoya Collection
Sometimes special varieties are also available, in large sizes/developed plants:
Hoya bella - Our Lady’s Tear
Blooms easily and abundantly. Its growth habit makes it suitable for hanging pots.
Hoya bella - Our Lady’s Tear - large specimens! - specimen available in store.
Hoya kerrii 'Albomarginata' (Taiwan)
Has heart-shaped leaves with light edges. A good choice if you like variegated foliage.
Hoya kerrii 'Albomarginata' (Taiwan) - specimen available in store.
Hoya calycina 'Stargazer' - XL specimens - the most fragrant Hoya
Variety with very intense fragrance, suitable for a Hoya collection.
Hoya calycina 'Stargazer' - XL specimens - the most fragrant Hoya - specimen available in store.
Frequently Asked Questions
Why doesn’t my Hoya flower?
The most common reason is lack of light. Other frequent causes are: plant too young, pot too large, frequent and aggressive moves, or peduncles cut after flowering.
Leaves are soft or yellow. What should I do?
Check the substrate and roots. Common causes are overwatering, compact substrate, or stagnant water in the pot.
Is it good to mist my Hoya?
Misting can help when the air is very dry, but it does not replace good light and proper watering. Do not leave water on foliage overnight if ventilation is poor.
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