Variegated Crassula: Identifying and Keeping the Pattern

Part of the The Complete Crassula Guide: Taxonomy, Cultivation, Propagation & CAM Physiology.

Several Crassula species carry named variegated cultivars. Crassula ovata alone accounts for most of them: 'Tricolor', 'Hummel's Sunset' (synonymous with ovata 'Sunset' in some trade channels), 'Hobbit' variegata, and a rotating cast of unnamed sports. Variegation also appears in C. arborescens, C. sarmentosa, C. perforata, and the stacked columnar hybrids such as C. 'Buddha's Temple'.

Part of the Complete Crassula Guide.

Types of Variegation

Not all variegation is the same thing, and the type determines how stable the pattern is.

Chimeric variegation. A genetic mosaic in which the plant's growing point contains two cell lineages, one able to make chlorophyll and one not. Most C. ovata variegates fall here. The pattern is heritable by cutting only if the cutting includes tissue from both lineages. A cutting taken from an all-green or all-white branch produces an all-green or all-white plant. This is why a single whole-plant propagation occasionally throws a reverted pure-green clone.
Pigment variegation. Variable distribution of anthocyanins or carotenoids, often light-dependent. C. capitella 'Campfire' and C. ovata 'Hummel's Sunset' in strong light are mostly pigment phenomena. The colour changes with light and temperature and is not technically a fixed variegation.
Viral or pathogenic patterning. Rare in cultivation and usually associated with declining plants. Ignore the "interesting" label and discard any Crassula showing a new patchy discolouration you cannot explain.

Keeping a Chimeric Variegate Stable

Chimeric variegates are prone to reversion. A branch that reverts to pure green will out-compete the slower variegated tissue and in time take over the plant. Three habits keep a chimera healthy.

Prune reversions aggressively. As soon as an all-green shoot appears, cut it out at its base. Leave only tissue that shows the variegated pattern. Do this every few months on actively-growing plants.
Give bright light. Variegated tissue carries less chlorophyll and is more dependent on strong light to photosynthesise adequately. Under-lit variegates stretch, lose pattern, and decline. A south-facing windowsill or bright greenhouse is the minimum.
Propagate from patterned tissue. When taking cuttings to back up a cultivar, choose shoots that carry both green and cream-white sectors along their length. Pure-white cuttings look striking but have no chlorophyll and will die within weeks.

Water and Substrate

Variegated Crassula take the same substrate and watering regime as their green forms, with one practical adjustment: they grow more slowly because total photosynthesis is lower. Water proportionally less. A variegated C. ovata in the same pot as a green one dries out more slowly and will rot faster if treated identically.

Fertilise lightly during the growing season, no more than half-strength balanced feed once a month. Pushing variegates with heavy nitrogen encourages reversion: the vigorous green cells respond first and begin displacing the chimeric tissue.

Common Variegated Cultivars

Crassula ovata 'Tricolor'. Cream, green, and pink-margin leaves; highly chimeric, prone to reversion.
Crassula ovata 'Hummel's Sunset'. Yellow to orange leaves with red tips under strong light. The coloration is mostly pigment-based rather than chimeric.
Crassula arborescens 'Silver Rose Variegata'. Blue-grey rounded leaves with cream streaks. Very slow; uncommon.
Crassula sarmentosa 'Comet'. Trailing species with cream leaf margins. Decent for hanging pots if given real light.
Crassula perforata 'Variegata'. Stacked triangular leaves with pink and cream margins. Stable if pruned.
Crassula 'Buddha's Temple' variegated. Rare; watch for reversion in the apical bud.

When to Worry

A chimeric plant that loses most of its variegated tissue within a season is either chronically under-lit or being fed too hard. Fix the light first. If the whole plant suddenly shows unfamiliar patchy yellowing with vein-clearing or distorted leaves, suspect a virus and isolate it from the rest of your collection.