Walk into any serious hoya collection and you will almost certainly find a cream-margined Hoya carnosa somewhere near the window, its waxy leaves edged in ivory or blush pink, new growth flushing an improbable coral before hardening to green. It is not a rare plant. It has been in cultivation since at least the mid-twentieth century, sold under half a dozen names depending on which decade you bought it, and yet collectors still argue about it in online forums with the intensity usually reserved for authenticated Hoya dressleri or a confirmed Borneo-provenance lacunosa. The source of that argument is almost always the same: someone has confused their 'Krimson Queen' with their 'Krimson Princess,' or bought one expecting the other, and now they are staring at a rooted cutting that does not match the photo in the listing.
The confusion is understandable once you know the architecture of variegation involved. These two cultivars are essentially photographic negatives of each other, and both go by names that include the word 'Krimson,' which does not help. Understanding what each one actually is — how the color is distributed, what the new growth looks like, how stable the pattern runs, and which name belongs to which plant — is the kind of foundational knowledge that separates a collector from someone who just keeps plants alive.
The Base Plant: What Hoya carnosa Actually Is
Hoya carnosa is a climbing epiphyte native to eastern Asia — China, Japan, India, and across into parts of Southeast Asia — and it has been in Western cultivation long enough to accumulate an ungainly number of common names. It grows vigorously on bark or wire frames, produces the characteristic umbellate clusters of star-shaped flowers that smell faintly of vanilla in the evening, and tolerates conditions that would collapse more finicky species. The leaves are succulent enough to store a little water, thick enough to feel almost rubbery, and covered in a waxy cuticle that gives the genus its popular name. In its straight species form, the leaves are a solid, dark, glossy green — handsome but not especially dramatic.
Variegation in carnosa occurs along a fairly predictable axis: color is lost either from the margins inward or from the center outward, producing two distinct patterns that have been selected for, named, and in some cases renamed so many times that the historical record reads like a minor clerical disaster. The plants themselves are stable enough in the right conditions, but the naming conventions around them are not, and this is where collectors begin to suffer.
Both variegated forms entered the US trade in the latter half of the twentieth century under the 'Krimson' branding, which was apparently a marketing decision by a commercial grower rather than a botanical designation. Neither name appears in any formal taxonomic literature. They are trade names, full stop, and trade names in horticulture are notoriously inconsistent across vendors, regions, and decades. Knowing this does not resolve the confusion, but it does explain why expecting the labels to be reliable is optimistic.
A cream margin and a cream center sound like minor variations until you realize the plant's ability to photosynthesize depends entirely on which one you've got.
Krimson Queen: Margin First, Center Green
The plant most correctly called 'Krimson Queen' — and the one that matches the majority of historical descriptions under that name — carries its variegation at the leaf margin. The center of the leaf remains green, capable of photosynthesis, while the outer edge runs cream to white, often with a blush of pink or true red on new growth. The pink and coral tones are most vivid when the plant is under high light or slightly stressed by cool temperatures; in low light the margins tend toward a flat, pale yellow-cream and the drama fades.
This marginal pattern is relatively stable and, crucially, it leaves enough green tissue in the center of each leaf that the plant can sustain itself without difficulty. A well-grown Queen in bright indirect light — think one to two feet from an east or west window, or under a quality LED panel running fourteen hours — will push new growth consistently and flower reliably on established spurs. The leaves run roughly four to six centimeters long in average indoor conditions, somewhat larger on outdoor plants in humid climates.
The new growth is where the 'Krimson' name earns its keep. Juvenile leaves can flush a deep coral-pink before any green develops, and a peduncle of fresh growth on a mature plant is genuinely striking. This phase passes within a few weeks as chlorophyll accumulates in the central portions of the leaf, but it accounts for much of the cultivar's appeal on social media, where photos of the coral flush circulate perpetually without clarifying which cultivar is actually pictured.
Krimson Princess: The Inversion
'Krimson Princess' carries its variegation in the center of the leaf rather than the margin. The green tissue is pushed to the outer edge, sometimes as a thin band, and the heart of each leaf is cream, white, or yellow. On heavily variegated leaves the green margin can be quite narrow — two or three millimeters — and on the most extreme specimens individual leaves are nearly entirely white, with only a ghost of green at the very edge.
This matters practically. A leaf that is eighty percent white is not photosynthesizing efficiently, and a plant producing many such leaves will grow slowly, stress easily, and be more susceptible to root problems when conditions are not ideal. 'Krimson Princess' is not a difficult plant, but it rewards careful attention to light levels in a way that 'Queen' does not. Too little light and the already-limited green tissue cannot keep up with the plant's energy demands; too much direct sun and the white portions scorch visibly, leaving translucent patches that do not recover.
The new growth on 'Princess' also flushes pink, which is one reason the two cultivars are so frequently mixed up at the juvenile stage. A newly unfurling leaf on either cultivar looks similar — a soft, coral-tinted scroll. The difference becomes apparent only as the leaf expands and the variegation pattern resolves. If the color retreats toward the center as the leaf matures, you have 'Princess.' If it consolidates at the margin, you have 'Queen.'
Why the Names Keep Swapping
The core of the naming problem is that no regulatory body governs trade names for ornamental plants the way botanical nomenclature is governed. The International Code of Nomenclature for Cultivated Plants provides a framework, but enforcement is essentially nonexistent at the retail level. A grower in Florida and a grower in the Netherlands can sell opposite plants under the same name and neither is technically wrong in any actionable sense. When a cutting passes through three vendors before it reaches a collector, the label may have been transposed once or twice along the way.
There is also a generational element. Collectors who have been growing hoyas since the 1980s and 1990s often have the names reversed from what younger collectors consider standard, because the labels were applied inconsistently in early trade catalogs. If your reference point is a cutting you received from a grower who learned the names in 1988, and my reference point is a vendor listing from 2019, we may be using the same words to describe different plants — and both of us will be certain the other is wrong.
The most reliable way to settle the question is to look at the leaf, not the label. Cream at the margin, green at the center: that is the plant most contemporary collectors and the majority of current vendors call 'Queen.' Cream at the center, green at the margin: 'Princess.' If you are buying unrooted cuttings from a photo, look for a mature leaf in the image rather than a juvenile flush, and ask the seller to confirm which pattern is present on established growth.
Growing Both Well: Substrate, Light, Water
Both cultivars want the same basic conditions as the straight species: a substrate that drains fast and holds its structure over months. A mix of perlite, bark, and a small amount of coco coir works well; some collectors grow carnosa in nearly pure bark with a handful of perlite and find it thrives. What the plant cannot tolerate is a substrate that compacts and stays wet for extended periods. Root rot in hoyas tends to be sneaky — the plant looks fine until it suddenly does not — so the goal is a medium that is damp for a day or two after watering and then genuinely dries out before the next.
Light requirements diverge slightly between the two. 'Queen,' with more functional green tissue, handles lower light reasonably well, though it will not push new growth quickly in a north-facing room without supplemental lighting. 'Princess,' because so much of each leaf is non-photosynthetic, benefits from being placed in the brightest spot you can give it short of direct midday sun. An east window in summer, or two feet beneath a 4000K LED running for fourteen hours, puts it in a productive range. The white portions of the leaves will tell you when light is excessive: they go from cream to translucent brown, and the damage is permanent.
Neither cultivar requires the high humidity that, say, a kerrii might demand, but both grow faster and more consistently above fifty percent relative humidity. Airflow matters more than most growers expect — still, humid air around the soil line is an invitation to fungal problems. A small fan on a low setting, or simply positioning the plant where it gets some passive circulation, makes a meaningful difference over a season.
Flowers, Spurs, and the Patience Tax
Both cultivars flower on peduncles — leafless spurs that the plant produces once and reuses repeatedly. This is critical to know because the instinct when tidying a hoya is to cut off any bare stalk that seems to be doing nothing. A peduncle waiting between bloom cycles looks like dead wood. It is not. Removing it costs the plant a season of flowering at minimum, sometimes permanently at that node, since new peduncles form slowly and not always where the old one was removed.
The flowers of both 'Queen' and 'Princess' are identical to those of the straight species: pale pink to white, with a darker pink corona, arranged in tight hemispherical umbels of ten to thirty individual florets. Up close each floret is a five-pointed star with a glossy, almost lacquered surface. The fragrance, strongest in the evening hours, is light and sweet without the heavy muskiness of something like Hoya odorata. In a room with several mature, flowering hoyas, the cumulative scent on a warm evening is one of the quiet rewards of keeping the genus at all.
First bloom on a cutting typically requires a plant that has established a significant root system and produced multiple mature internodes — often eighteen months to three years from a small cutting, depending on conditions. Experienced collectors sometimes accelerate this by maintaining consistent temperatures and avoiding repotting during the growing season, but there is no reliable shortcut. The plant flowers when it is ready.
What Is Worth Chasing Beyond the Classics
Once a collector is comfortable with 'Queen' and 'Princess,' the obvious next step is the broader carnosa complex. Hoya carnosa 'Compacta' — sometimes called Hindu rope — is a crinkled, contorted form with the same care requirements and the same variegated sports available in cream-margined and cream-centered forms. It grows slowly, looks architectural rather than vining, and flowers with the same umbellate clusters. The variegated compacta forms are genuinely slow and should be treated as the more demanding 'Princess' analogy: limited green tissue, high light, careful watering.
Hoya pubicalyx, while technically a separate species, occupies similar care territory and is often sold alongside carnosa cultivars in collections. Its leaves are narrower, sometimes splashed with silver, and the flowers range from nearly black-red to pale pink depending on the cultivar. It is vigorous and blooms more readily than carnosa in many indoor setups, which makes it a reasonable companion plant if you are building out a collection on a wire trellis or moss pole.
The deeper end of the genus — Hoya kerrii, Hoya linearis, Hoya wayetii, and the increasingly available splash-leaf forms of various species — represents a significant step up in both cost and care specificity. But the foundational skills built on carnosa translate directly: fast-draining substrate, appropriate light for the leaf's chlorophyll load, respect for the peduncle, patience with new growth. The cream-margined carnosa is not a beginner's consolation prize. It is a genuinely good plant that happens also to be a reliable teacher.