The tricolour wax plant (Hoya carnosa 'Krimson Queen') may produce solid green leaves due to genetic reversion, which happens when the plant's growth reverts to a more stable green state. This reversion occurs because green leaves are more efficient at photosynthesis, leading to stronger, albeit less attractive, growth. To maintain the plant's variegation, it is recommended to prune back the reverted vine to the last variegated section, thus encouraging the plant to focus its energy on producing tricolour foliage. Additionally, the plant should be kept in bright, indirect light and regularly monitored.
Variegated plants can sometimes produce reverted growth, where new leaves return to their green form... Unfortunately, once a vine starts producing solid green leaves, it is unlikely to develop tricolour variegation later on.
If you want to preserve the variegation, it's best to prune the reverted vine back to where the last variegated growth occurred. This encourages the plant to put energy into growing more tricolour foliage.
Keep your hoya in bright, indirect light. Check regularly and trim off any non-variegated parts to encourage more of the striking tricolour pattern.
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